Excess body weight contributes just as much to overall speed as the weight of the bike. The weight of a typical road bike is on average 18 pounds, including the pedals and cages. Heavier riders will descend faster. The tire rolling resistance values shown on BicycleRollingResistance.com were used because that website contains the most up-to-date and complete list of tires (for further discussion about rolling resistance, see the Blather ’bout Bikes blog and the Silca blog). Within a small range, a 1 lb. I’m 6′6″ tall and have weighed anywhere between 220 and 275 pounds over the years. http://www.cyclingpowerlab.com/PowerSpeedScenarios.aspx. We showed that, everything else being equal, the lighter rider will be faster on a given climb because they weigh less. Just like outdoors! Read “ How Rider Weight Affects Speed ” for specifics. But weight isn’t much of a big deal if you just want to bike for health and fitness. 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. Height: taller riders are less aerodynamic than short riders, so the shorter rider will go faster if two riders are holding the same wattage and everything else is … Then he calculates how long it will take a cyclist riding four different bikes—15-, 16-, 17-, and 18-pounds—to get up a mile-long hill. Those 6 seconds/pound grow ever smaller. The circuit was designed to mimic a day touring in the mountains, whereby almost 2000m(6562ft) of elevation wa… For a 150-lb triathlete, cycling this distance at this speed would burn approximately 682 calories. So what this means for any cyclist is that the greater your strength compared to your weight, the faster you are going to be on the bike. You won’t necessarily save much power on a lighter bike until the road grade climbs to 10% or more. I took my Surly Long Haul Trucker with two large panniers (mounted to my rear rack) on a 15.37km (9.5mi) long undulating route which offered 276m (905ft) of climbing. He goes on to say that a lighter bike weighing 11.79 pounds don’t even bank a 10-watt difference over a heavy bike (15 pounds). For professional cyclists weight of bike and body is very important. 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. Therefore, if you can some lighter wheels, the benefit from the weight saved will be greater. The effect of tire weight on climbing speed is easily calculated. If you are just looking for a simple bike… If you’re really into cycling and you’re a professional athlete, then yes, weight does matter (a lot). The weight of a bike does not have much effect on how fast you can go. How much? 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 of frontal area and they will roll down the hill faster. Quote | Reply. The variations in body weight, however, being so much greater, make large difference. At a fast cycling speed of 20 miles per hour, completing the 20-km cycle section of a sprint triathlon would take 37.5 minutes. Plugging a few sample numbers in, losing 5kg means you will go about 1kph faster up a 5% incline for the same effort. At a body weight of 120 lb, a triathlete completing the same distance in the same time would burn only 545 calories. Nov 22, 08 6:27 Post #1 of 38 (24406 views) How much difference will dropping 10-15lbs of fat make on bike times? According to the empirical tests on Alpe d’Huez adding an extra 1.8 kg to wheels was an extra one minute slower than putting the weight on the bike. 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