In the past years I've owned a 125 funduro, a 650 thumper and my 919. Why did you take the comparison out … which I thought was the most interesting piece? They come with a helmet that might even … Using the calculations from a 160-lb. This community-driven site is maintained by Eric Schlange and a team of Zwift enthusiasts. Usually a tire's weight is directly proportional to how much reinforcement is … “In terms of the effect of mass on fuel consumption it depends on the duty cycle,” He says. And they answer that eternal question: should you work to lose weight, or invest your money (Drops) in a faster virtual ride? Thanks for this Eric, interesting indeed. In all cases there are a few basic principles that will help you: Power to weight ratio - the lighter the bike and the more powerful the engine, the faster it will go. In other words, if you double the size (height) of the rider their mass goes up by 2^3=8x, but their frontal area only goes up by 2^2=4x, and they have twice as much weight for each unit … Let’s find out! Can those who are not returning from layoff or injury lose 4.5kg or so and maintain the same power? This is actually true technically, but the effect of body roll on weight transfer is tiny, possibly less than 1 percent of the total. ... nutrition and how you are feeling on that particular day all have as much effect. Thank you The reason I'm asking this is because I LOST my road tires because I'm an idiot, so I can't just swap the tires out to see what the difference is. If you aren’t putting out power on a downhill in a race, you’ll get dropped–no matter what you weigh. I have experienced heavier riders maintaining a higher speed on the flat due to being able to produce more watts and still not exceeding the overall category limit (Cat C – 3.2w/kg). Hi Eric — any idea if weight (rider + bike + wheel) affects acceleration in zwift? Weight does affect your speed on the flats in Zwift, since it changes your computed CdA. Obviously depending on your FTP and their FTP if it is a long climb the other riders might be able to hold power for longer, but you should go the same speed or faster for equal w/kg on climbs as well as flats. suspension setup to the rider and his riding style is highly recommended and often times a overlooked investment. in races I have the feeling that a lot of the riders are cheating, I know for myself that I can ride the speeds outside as I achieve in zwift. Great! Sure, weight matters the most on climbs. The day I chose was sunny, warm and dry. A lot. Riding identical bikes, a lighter rider will have better acceleration and top speed than a heavier rider. Makes a huge difference in the sprung/unsprung ratio department. Besides an obvious lack of grip (particularly when wet weather riding), worn tires can also display poor balance and even patter.. For wheels, the multiplier is closer to 1.6, so saving 5 pounds per wheel (20 total) would feel like a static weight reduction of 32 pounds. The circuit was designed to mimic a day touring in the mountains, whereby almost 2000m(6562ft) of elevation wa… , If people weren’t “inspired” to weight dope already, this will inspire them . Hi Eric, just wanted to know if zwift takes bike weight into the equation, I estimated from another empirical model that the time savings are between 200-250seconds on an average 8.5% slope so there’s nearly a minute extra in your analysis. This is because an object with more weight is more massive, and an object that is massive has more inertia that causes it to resist any change in speed. If you need to lose a lot of weight, then it's important to continually reassess your performance and training and racing paces. I want my results and PR’s to be mine and not because I digitally lost weight. Numerous studies have been performed to show just how much weight effects a cyclist 1. Since heavier riders have to work harder than their thinner counterparts to maintain the same speed, it's no wonder that the world's fastest cyclists are thin and have a very low body fat percentage. Descent tests were completed down Alpe du Zwift, an -8.5% average gradient which is 12.2km long. I feel for you Duncan, I’m the same… I can’t give up when I know there is something somewhere in the cloud that I have seen or even wrote myself before, and now I can’t find it. All in all a fair compromise. Keep up the good work, and enjoy watching that w/kg number bump up! Too many death threats from lighter riders? added to a rider, it would take him an additional 30 seconds to ascend a steep climb. A large rider adds 50% to the weight. This effect is usually minimal but can drastically effect the operation of the motorcycle if the trailer is overloaded. Something that’s always confused me…when entering weight, should it include being fully kitted up in shoes, or in your birthday suit…ahem..? Besides an obvious lack of grip (particularly when wet weather riding), worn tires can also display poor balance and even patter.. As an example, let’s assume you have a front fork out of the motorcycle, and inside that fork you have a space for a spring that measures 320mm. Conclusion: reducing your body weight by 1kg will cost you 1 second on a 10-minute Alpe du Zwift descent. As such, we are more concerned with weight rather than mass. Conclusion: reducing your body weight by 1kg will save you ~45 seconds up Alpe du Zwift. A heavier motorcycle will always have a powerful engine, meaning it can go very fast from zero to sixty and above; and before you even know it, you’re losing its control. Pretty sure only lardasses will say that.. Most honest people do, the only one you cheat in games or like such by cheating is yourself. power to weight ratio includes the rider. An object with more weight resists any change in its speed and has a … A similarly slight 70kg rider adds a massive 35% to the gross vehicle mass of a 200kg motorcycle. You're going to be like 50-100lbs lighter! level 2. It has been known for years that additional weight slows one down when climbing. This would have the exact same effect on geometry as … I really enjoy your website and am an avid participant . No, wrong, really wrong. Thanks and good week. Weight does affect your speed on the flats in Zwift, since it changes your computed CdA. rider on a 5 kilometer, 7 percent grade, he concluded that for every 5 lbs. […]. Riding identical bikes, a lighter rider will have better acceleration and top speed than a heavier rider. We made Craig labour in the cold January weather to see how much weight affects your cycling speed. Would be interesting to see the same test matching w/kg (as opposed to pure watts), maybe you’ve done this already? I had lost about 5 kg over the past several months but was reluctant to change my avatars weight thinking I was faster in flats so you can bet I’m changing my in game weight to reflect my true weight based on this info. Riders complain about getting dropped on descents in Zwift, but that isn’t because the algorithm is computing speed incorrectly. I do because I want my data to be able to show my true improvement as I lose weight and get fitter. CCs are a big factor to keep in mind—especially if you're a beginner. As a lighter one, I always prefer hill where it’s a matter of w/kg. There are three avatar body types, based on BMI thresholds. For wheels, the multiplier is closer to 1.6, so saving 5 pounds per wheel (20 total) would feel like a static weight reduction of 32 pounds. And that doesn’t include wind resistance, which would further reduce the speed advantage. Your bike weight will be added to that (and it varies depending on which bike/wheelset you use!). 2 years ago. Some people may be surprised that the difference is not grea… Top speed, no. Eric, I have been re-reading this article with added interest. Body weight is one of the many factors that affect your running times. Craig0657 Posts: 24. How much the bike weighs. Climbing tests were completed up Alpe du Zwift, an 8.5% average gradient which is 12.2km long. He lives in Northern California with his beautiful wife, two kids and dog. The time gap here is over 6x what we see on the flats! Not to mention the obvious that eating a main meal or going to the toilet, also affects what we see on the scales. Jealous. Looks like you're using new Reddit on an old browser. For that reason it’s important to realise that your preload changes directly affect geometry. I’ve just discovered my zwift weight syncs automatically with my fitbit scales, so this is quite good motivation. Each route has a characteristic joule/kg. ??? between the start and the end of a hard workout, it’s normal to lose nearly a kilogram in weight. Not surprisingly, up the steep Alpe climb is where we can really see how much weight affects rider speed. Bloody great Harley or Wing - not much difference. good test but if you tested more than 2 weights it might be interesting to see if the relationship is linear or curved, is it really as simple as saving X seconds per kg or is it a law of diminishing returns or does it actually increase the effect the more you lose? Designed in a progressive, but negative, way the data to show just how much weight affects your speed... 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