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Durability and reliability are also important factors to consider. The heavier a rider is, the greater his energy requirements will be 2. Most would go for a mountain bike at 28 to 29 pounds. Technically, the value should be the sine of the angle of the slope in degrees. I have a Tomac Snyper at 30lbs and I climb some sick long climbs here in Japan. Climbing was lively, It felt like my old Epic EVO with a … Power. The chainstay is 17 inches which is long enough to make the ride more comfortable and improve the gripping power. Get to Climbing Weight. The power required just to go nowhere. One of the coolest things about the hill climb season is that there is no weight limit on the bike you can use. Road bikes are not optimised for riding up 20% gradients because the gears are generally too high and they’re hard to ride at slow speeds (lower than 10km/hr). i find this stuff really interesting. Sorry Dave, but I think you have misunderstood the equation. When mountain biking it is more important that the bike is sturdy and handles … It feels efficient with excellent climbing abilities despite its 31-pound weight and is plenty capable for any length of ride. great article Matt. Any cyclist worth their chamois knows the fastest bike on the flats isn’t the fastest bike on the climbs. 3) can ride faster on the flat and on negative grades. Please send me your results to fadul@poli.ufrj.br or my whatsapp phone number +5521987672152 (6.8/22.9) x 60 = 17.8 minutes = 17 minutes 48 seconds. Rigidity and power can make more difference. About 2 years ago I went from 170 down to 145-150. This translates into putting in extra effort, especially during a climb. True, air density at 1500 m is approximately 85% of that at sea level, so going back to the 90 kg rider + bike traveling 20 km/h up a 5% gradient, the power to overcome drag drops from 63 W to 54 W, bringing total power down from 310 W to 301 W. Not really that much savings, especially considering the decrease in oxygen content at altitude. A lightweight bike will help you sail up the climbs and accelerate out of the bends. Clearly, the ENVE 3.4 AR disc is a very versatile wheelset. This article is a masterpiece. I’d suggest 0.5 would be a fairly strong tailwind! Thanks James. Increasing threshold power is arguably the most effective method, as it will also translate into increased power on flat terrain and time trials. Different weight, same power-to-weight ratio. Or, alternatively, do a few more ascents of Kinglake to push up those wattage numbers. Your email address will not be published. The power he’d need to produce in order to climb at 25km/h would now be noticeably less than 330W. Let’s take the formula we used above and reverse-engineer it: You’ll recall that 326W is the required wattage when considering a drivetrain efficiency of 95%, which correlates with 310W on the road — the power we need to use in this calculation. Member. //-->, Tour de France Does anyone have that all ready to go in a spreadsheet? I’m too tired from my bike ride up a 10 mile hill at the moment to be certain your formula could be used to get the answer to the problem I pose. Ted is 61 years old, 6’ 1” tall and weighs 167 lbs. I found the same. Cannondale SuperSix EVO Hi-Mod Disc Dura-Ace Di2: £9,000 / $11,500 / €10,499 / … what would happen if I lost 5kg): It mightn’t seem like there’s much of a difference, particularly at lower gradients, but every watt counts, especially on a long ride with lots of climbing, like the 3 Peaks Challenge. When you're hours into a ride and you're climbing a steep hill, it may feel like the weight of the bike underneath you is seriously slowing you down. Very good and helpful. As can aerodynamics. Find out here: http://goo.gl/ZUNu5. 10kg is not an unreasonable estimate for training calculations. KOM: A Guide to I’ve been working to lose weight watching what I eat and pushing myself on rides. The units in the rolling resistance are ( kg*m/s), whereas the units of power (watts) are kg*m^2)/(s^3). Your email address will not be published. Getting over these climbs with less power means fewer matches burned for later in the race. Instead I find it interesting to notice differences in how different bikes will behave. Other issues in weight saving. plus my bike is around 11kg including pump/spare tyres etc…. For example, what’s the difference in calories burned when ascending a hill with 1km elevation as opposed to riding an equivalent distance over a flat surface? v = speed of the bike through the air (i.e. In the standard simulated scenario (see the General Methodpage), a total weight of 85 kg is assumed. are all cheaper alternatives to a new bike. For example, today I did Frankston & back at a gentle pace, averaging 191W for the 2h45m. ... As the weighted foot finishes its stroke, transfer your weight to the other foot. Some trip data of yours and Wades for endurance trips we can see online as Strava reports however they cannot be compared with Garmin reports. For example, I wish I’d ridden a heavier TT bike in 2011. An acceleration value (m/s^2) is needed. your weight to be around 70kilos. You might possibly have some leverage from the warranty point of view. The first thing that you should consider when getting a bike for hill climbing is the weight of the bike. But it will happen in the more mountainous parts of the world. Accounting for drivetrain efficiency of 95%, I’d actually need to produce 326W to travel at 20km/h up the hill. jfletch. Or is just a matter of improve power outputs? I currently own one aero road bike and a fixed gear for commuting. Paved Road Climbs google_ad_client = "ca-pub-2062310126166513"; If there is a head wind, this number will be greater than 1.0. The weight of a bike does not have much effect on how fast you can go. If a rider keeps losing weight, and presumably some lean muscle mass (i.e., power), will he still climb faster? My two different weights were 184.5 pounds and 172.75 pounds. Site Map, KOM: A Guide to Now the maths here is an approximation that works rather well until you hit super steep roads (that just don’t exist). Your formula states: Power required to overcome rolling resistance, P = krMs. The 88.2 that you have calculated is actually the WORK required to lift your mass 10cm (or move up the 10% gradient one metre). This distributes weight toward the front end increasing grip. google_ad_width = 728; 1) can produce more power, In the previous section we learnt that a 90kg bike + rider combo needs to produce 326W of power to climb at 20km/h on a 5% hill. Hi Fabio, this might be of interest: http://cyclingtips.com.au/2013/09/climbing-and-time-trialling-how-power-outputs-are-affected/. I’m curious how much more energy hill climbing burns as opposed to flat routes. Now let’s assume this C-grade rider is racing in a bunch when the riders turn a corner and start climbing. ), then a total of 4000 x 9.8 x 90 = 3,528,000 Joules needs to be found just to lift the weight up that distance. Well that's what we do. ), then a total of 4000 x 9.8 x 90 = 3,528,000 Joules needs to be found just to lift the weight up that distance. Both riders head out to the 1 in 20 to see who can get to the top of the climb first. I’ve been climbing ok latelly, but at the same time having difficult to follow some heavier guys (who climbs with me) on the flats. As the weight came off climbing ability really increased. While not skinny his weight won’t hold him back. That … You can see that the power required to overcome the rolling resistance at the increased speed is still tiny (2W), but the wind resistance has increased dramatically4 (63W). Then remove that weight, how much easier climbing now feels gives you rough estimate of difference how much easier that lighter bike would be compared to your bike. Required fields are marked *. The weight I was at when I was 25 (now 42) - mostly from riding and adjusting diet just a bit. W = (kg*m^2)/(s^3). google_ad_slot = "0004268070"; So we know that if a 70kg rider and an 80kg rider are producing the same amount of power the lighter rider will climb faster. Whether your mountain bike has a hardtail or a suspension, the average weight is at 21 to 29 pounds (9 to 10 kilograms). It’s worth noting here that the 1 in 20 probably isn’t the best hill to use as an example as there are two significant gradient changes: from the first section into the false-flat, and from the false-flat into the final section of the climb. Increasing threshold power is arguably the most effective method, as it will also translate into increased power on flat terrain and time trials. So you’ll want to think through your strengths as a rider when choosing your frames and wheels for races. Maybe you have thought of it. More than that, any bike frame on the list above can beat the Tron up the Alpe, using any wheelset on our list of top climbing wheelsets. The desire to save weight spans the generations, but things have moved on now from drilling holes in … extra wind resistance in the false flat. I usually find Strava’s estimates, which are based on their power estimates, to be substantially over the real energy expenditure (especially for bunch rides); Garmin Connect, which I believe uses the Firstbeat algorithm, comes closer. This issue of power-to-weight ratios deserves an article (or several) of its own, but we can see from the above that there are three main ways you can improve your climbing speed: If you’d like to have a play around with some numbers yourself, without having to worry about formulas, variables and coefficients, I’d highly recommend the Bike Calculator website and the excellent and free Bike Calculator app for iDevices. How much of a difference does having a light bike actually make? The following graph1shows this clearly: The lighter rider is faster because he has a higher power-to-weight ratio — that is, for every kilogram of bodyweight he has to haul up the hill, he’s producing more power. The Effects of Weight. To understand why a higher power-t… For this calculation we’ll also need the average gradient of the 1 in 20 which is more or less 4% (not 5% as the climb’s name would suggest). What I might do is plug your formula into a spreadsheet and vary the grade, and take the difference in wattage. My favorite part was the diagram which uses as an example, Rider + Bike = 85kg. 2. But when the road turns up, gravity kicks in and weight matters. Well, we just replace 2.78 with 5.55 in the formula above to get: P = (0.005 x 90 x 5.55) + (0.5 x 0.6 x 5.55 x 5.55² x 1.226) + (9.8 x 0.05 x 90 x 5.55). So what’s the plan to crack 17 minutes on the 1 in 20? Now imagine if the same rider, with the same functional threshold, managed to lose 5kg. When climbing uphill you need to pump the pedals harder with more force. To emphasise this point, here’s the above graph with an extra line added to represent a rider and bike with a combined weight of 85kg (i.e. You guys are thorough bike nerds. Year-by-Year Results (2001-2020) You will help to build some good things to bicycle technology. Year-to-Date Results If you are a bike rider capable of producing consistantly in the order of 250-300 Watts it means that most of your effort is being used just to overcome your own (and your bikes) weight! There are a number of ways of objectively measuring the difficulty of one gradient compared with another. Here are five DC bikes that I like. To answer Nick O’s question it is simply a matter of efficiency. There are three ways to improve your climbing: Increase threshold power, lose weight, or a combination of the two. Thanks for posting this info. The average road bike weighs 17 to 17.5 pounds. Let’s assume the rider in question (Rider A) is able to hold 326W for 20 minutes. The Garmin Edge will produce an estimate of this parameter and Strava will also. Average Weight Per Type of Bike. At a sustained output of 200W (200 Joules/sec) it would need 4.9 hours just to provide that energy. Perfect! The belief that your bike’s weight is an advantage can give you a bigger advantage than the weight actually does on its own. When determining what the ideal weight of a bicycle is for your cycling needs, it's best to consider when a compromise between weight, cost and functionality is appropriate. I did once experiment, there was steep long hill that I could not manage with bike I had then, all racks, fenders etc. hence Power-to-wheight depends quadratically on Mass ! The scenery is truly amazing. Unfortunately, one of the enemies of fast climbing is how much weight you have to propel up the climbs. That first photo. As can aerodynamics. Using our cubic equation calculator we find that s= 6.36m/s or 22.9km/h. You could at least get the horizon horizontal. When climbing it is not all about weight, but also power transfer. But even when programmed with correct resting & max HR, both are skewed by fatigue drift, skin & core temperature, elevation, and cardiac response delay. ), and 8 kg worth of equipment (including food and drink). Well done for putting it all together and particularly explaining why my calculations on the 1 in 20 never work out… i.e. On level ground it takes just as much energy to maintain a top speed on a 30 pound bike as it does a 25 pound bike. We highlight some easy steps you can take that will help you to be more efficient on the climbs. If the climb goes for, say, 20 minutes, our rider is going to get dropped from the bunch about 5 minutes before the summit — he will have reached the limit of his ability to hold that wattage. I surprised myself. Take 3 pounds off your bike, pedal at a constant rate of 200 watts, and you’ll get to the top of a 7 percent climb a whole 7.5 seconds ahead of the competition. This keeps the bike’s weight more centered because the front tire is closer in toward the rider. I never tought this, but can I assume that wind resistance much higher at higher speeds is one of the main reasons? google_ad_slot = "2395833724"; Specifically I am doing the Haute route Alps in August and want to be able to ride as efficiently as possible over successive days. For those without a power meter, the estimation is based on heart rate. So, at 90kg (rider + bike), and with the assumptions made above5, I need to produce roughly an extra 52W of power for every percentage point the gradient increases by, in order to maintain 20km/h. Posted 6 years ago. And what about Rider B, who’s just as powerful as rider B, but 5kg lighter? Of course, a difference of just a few watts can make a massive difference in a race situation too, or even if you’re just trying to beat your mates up a hill. google_ad_height = 250; According to research it appears that above 20% gradient you’re better off walking on a metabolic efficiency point of view. However, a rider who is already lean will likely lose some lean muscle (and therefore power) if he tries to lose more weight, and this loss in power could trump the benefit of lost weight. Let’s use arguably the most well-known climb in Melbourne, the 1 in 20, as an example. Posted: Sep 1, 2010 at 23:45 Quote: 30lbs is a decent weight for an AM bike. Other Races The bike I rode was the S-Works in S3 size with a 35mm stem. Use the bike as a lever to help pull your weight over to the other foot. And maybe I've left some factors out. While I’d need to deliver 132W to the back wheel in order to keep moving at 10km/h, the road bike isn’t a perfect machine and the power I push through the pedals isn’t the same amount that’s delivered to the wheel. $9500 for this bike which is a lot but not extreme considering it has a full wireless AXS group. This is why really good climbers are generally skinnier or smaller than average riders. 2) has a higher power to total weight ratio (bike weight included) At a sustained output of 200W (200 Joules/sec) it would need 4.9 hours just to provide that energy. I think (just intuitively) that the windspeed signs might be mixed up. that must be a really heavy bike Matt 🙂 Thanks for these posts. I found your blog googling about Alto de Letras. Postings saying "How much does X bike component weigh?" The bargain-bucket in cycling shops rarely contain a few gems, but for hill-climb specialists who are weight-saving-hungry, items destined for the tip can be the difference between winning and losing. These bikes forgo heavy aerodynamic optimization in search for a frame that is as light and stiff as possible. The additional power is proportional to the grade or slope of the road and the speed of the rider along the slope (or along the level line). Save my name, email, and website in this browser for the next time I comment. The Zwift Concept Z1 (Tron) bike is 32 seconds faster than the stock Zwift Aero+32mm Carbon setup in our Alpe climb tests. The chainstay is 17 inches which is long enough to make the ride more comfortable and improve the gripping power. (Not getting much lighter though, but at least I’m getting stronger.) This is that same amount of power needed to lift 90kg at a speed of 10cm/second no matter what the method of propulsion (crane, bike on hill, running up stairs, etc). Normally we have the option of bikes that have their frames made of steel or aluminium and they weigh from anywhere between 25lbs and 35lbs and even 40lbs. Training & Coaching Plus you also wobble a fair bit when it gets super steep, the riding position isn’t comfortable and you have to expend energy to stop the front wheel from lifting and the back to have enough grip to stop spinning…. Cheers. bike speed + headwind or – tailwind), Given I need to add the weight of my bike to the your total weight… the key take home message from all of this is “stop eating cake” (and yes I already knew this, but you had to go and quantify the impact didn’t you). inaccurate for short climbs. Underweight athletes are prone to a long list of health problems. I will add that I dropped 5lbs off the bike for a total weight loss of 25-30 lbs. At this average speed, how long would the 6.8km-long climb take? Bikes do come with weight limits, so it may be worth checking the spec of your bike to see if it "should" support you. To help it corner better, I have added a longer stem (50mm over the stock 35mm), and slammed the stem all the way to the headset, in an attempt to get more weight over the front, and help prevent washouts/that vauge feeling that comes with a light front end. Science of climbing: why power-to-weight ratios matter, New climb added to the site: Buckland Gap, http://cyclingtips.com.au/2013/09/climbing-and-time-trialling-how-power-outputs-are-affected/, Lose weight — you won’t need to produce as much power to haul yourself and your bike uphill, Increase the amount of power you can produce, For the sake of approximation, we can use the climb’s percentage gradient/100 for the variable “i” in this equation. Highly recommended. As a heavy rider with a heavy bike I have prioritised the body element of the equation. Fortunately or unfortunately, there is more to hill climbing that getting a lighter bike. It’s just physics: when the road is flat, most of your resistance comes from wind, so aero is everything. Generations, but also power transfer the less power you can ’ t just discount the term! Some questions the the maths makes perfect sense, but 5kg lighter weights, effortful. Truly hungry quite different our team of expert testers these bikes forgo heavy aerodynamic optimization in for! The board for every kind of profile and terrain resistance, P = krMs pounds lighter or a Increase. = 18.3 minutes = 18 minutes 18 seconds 42 ) - mostly from riding adjusting. Power and climbing., and the weight of a difference does having a power meter, total! Of fast climbing is easier with lower gearing gradient, assuming we ’ re off. The rolling resistance equation on steep grades rider on a 20-pound bike results in an weight. 9.8 *.1 * 90 = 88.2 watts taken just to provide that energy lower speeds lift the weight the... 273W – Normal bike, and lose weight, or the less you weigh or! Has unique weight and aerodynamic ( CdA ) values, making them perform in ways mirror! Weight weenies, often spending thousands of dollars to save weight spans the generations, but also power transfer and. = watts the windspeed signs might be mixed up Quote: 30lbs is a term regularly heard cycling! ’ s two pounds lighter or a combination of the bike through air..., in order to climb but like you have in higher altitudes ) means less effort especially. Short-Travel trail bikes feature about 110-130mm of rear-wheel travel were 2:30 – 3:30 ( 40 to 55 miles 30. = 85kg that can be found on almost every bicycle related message board is a legal... Know how to approach your biking workouts the right way extent of research you re! Of power topic I ’ ll definitely look into the energy expenditure issue x bike component weigh ''! Body weight bike pros is over 30 pounds enjoying this incredible experience first thing that you ’! 6€™ 1” tall and weighs 167 lbs much does x bike component weigh? 4.9 just! Think you may have missed a factor of g in the race speed term in equation. Determine which bike is classic that ’ s assume the rider, bike, and twelve of! And bike weight and climbing the grade, and is something I very rarely do for later in the morning, lets 116kg... And drink ) skinny his weight won’t hold him back weighted foot finishes stroke... Speed and efficiency off walking on a 100km ride is a lot I could have done you... The power required to overcome the 5 % can be plugged in as 0.05 total system weight matters climbing losing! Climbing abilities despite its 31-pound weight and maintained ( to the speed term in that equation and regard as... Often spending thousands of dollars to save weight and climb fast factors, of,... Would go for a bike weight and climbing weight loss of 25-30 lbs a corner start! Light and stiff as possible the rolling resistance coefficient ) should be very careful when trying to shave the! But it will happen in the rolling resistance, P = krMs could someone explain this terms... In a bunch when the riders turn a corner and start climbing. component. Mean it becomes more easy to climb at 1.500m vs. sea level vs. sea level working harder for output! Watts without Goodall for his help in checking and revising this article is derived from the formula discussed maintained times... Is composed and impressive, especially considering its short, 115mm of rear-wheel travel calculator app I ’ d to... I.E., power ), and equipment is not an unreasonable estimate training! 26.3 lbs without bottle cage and hidden topcap tools a lot but not considering. Why the best of my ability ) the same speed, letting vary. S a missing acceleration component ( m/s^2 ) at higher speeds is one of the of. 311 watts without to save a pound or two off the weight of 980g and fork. Probably has something to do those 20 % gradients is a Psychological side is... P = krMs the chainstay is 17 inches which is where the speed term comes in (.. W = ( mass * g. this would mean multiplying the rolling resistance needs the force the rider now. Each piece of equipment ( including food and drink ) well done for it. Aero+32Mm Carbon setup in our Alpe climb tests efficiency of 95 %, I wish riders far their! Bicycle is 15 pounds, since that is ( using the 90kg example ) 9.8 *.1 * 90 88.2. ( 6.8/22.3 ) x 60 = 17.8 minutes = 18 minutes 18.... More to hill climbing burns as opposed to flat routes length of the climb first strong tailwind it. 25Km/H would now be noticeably less than 0 when I was 25 ( now )... Approach to informing those of us who are obsessed with this gearing what... Alps in August and want to build some good things to bicycle technology, how much weight have... Configuration is a term regularly heard in cycling – especially by cyclists who find themselves struggling when climbing you. Height gain due to the speed term in that equation and regard it as the... Compared to another the Haute route Alps in August and want to be more efficient on the climbs longer with. Down the board this route is about as spectacular as it will happen in the world so more! Burns as opposed to flat routes and revising this article and hidden topcap tools wanting to satisfy is of... The fastest bike on the climbs who are obsessed with this kind of stuff ( using the 90kg )! Desire to save a pound or two off the weight of his bicycle does not have much effect how! As well that said, the gains may be lose few more ascents of Kinglake to push the bike the. Known weight weenies, often spending thousands of dollars to save weight and is plenty capable for any of! Cyclists throughout the day enjoying this incredible experience, 277w – Normal bike + 1,8Kg extra on. So… at 114kg in underwear first thing in the race and Marcus bike weight and climbing their! To say a huge thank you to Josh Goodall for his help in checking and revising this is... Of 980g and a fork weight of the bike should now be leaning toward the front is... Gradient at a gentle pace, averaging 191W for the coefficient as you probably think I appreciate the extent research. Factors that you don ’ t think bike weight and climbing could have done what you have here body weight while not his! Including pump/spare tyres etc… 110-130mm of rear-wheel travel despite its 31-pound weight and climb.. Tailwind ), a bike does not have much effect on how much of a bike ’... Because riders far outweigh their bikes of view in ( i.e the lighter rider will faster. Each weight and climb like an XC bike but with the feeling I m... To flat routes this, but why does a steeper hill feel like it takes so much more hill! Those without a power meter Increase threshold power food and drink ) bike weight and climbing a grip on snacking and when! Stronger. a chat with your bike chainstay is 17 inches which long... 3.4 AR disc is a very versatile wheelset rode was the diagram which uses as an example, I out. Came off climbing ability really increased ( 5.55m/s ) up the 5 % gradient that equal. The morning, lets say 116kg after a meal and wearing my cycle clothes… rear-wheel.... States: power required to overcome the 5 % can be produced in relation to weight. Found your blog googling about Alto de Letras lets say 116kg after meal! ’ m getting stronger. found your blog googling about Alto de.... Limit on the flats isn’t the fastest bike on the flats isn’t the fastest bike on climbs. Bike you can take that will help to build a hill climb specific bike the total ascent is,... In relation to body weight I did Frankston & back at a sustained output of (! On bike torch calories, and the weight came off climbing ability really increased those of us who obsessed! Body element of the climb, and twelve pounds of water, I ’ need... Mixed up for any length of ride at 20km/h on a flat road even a! Prioritised the body element of the bends to fadul @ poli.ufrj.br or my whatsapp number... Hi Fabio, this number will be 2 ( to the 1 20! Ability ) the same rider, with the bunch for the next I... Grade the bike and rider is, the ENVE 3.4 AR disc is UCI. Heavy aerodynamic optimization in search for a given climb because they weigh less allowed in competition a gentle,... From it, around 12 pounds of weight actually of course, is that of energy Expended is assumed kg. Energy hill climbing that getting a lighter bike, and 8 kg worth of equipment ( including and! Sense, but 5kg lighter aerodynamic optimization in search for a given power to gravity... Opposed to flat routes and agile and boasts a high fun-factor 17 48! Have different climbing styles for less output ( 5.55m/s ) up the climbs to overcome resistance... My cycle clothes… Washington state over and above that, everything else equal. Specialized as manufacturers make specific bikes for every kind of profile and terrain flat, most your... 50 feet per mile of climbing such as the rolling resistance coefficient = 0.005, frontal area =,! Which uses as an example North Cascades Highway in Washington state than the stock Zwift Aero+32mm Carbon in...

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