hoodoo40 said:I'm no speedster, more of a long commuter. I do try to stay low most of the time. I especially make sure I stay low if at 15 mph or over.
ok, aerodynamic position is important, but last weekend, I was out on a group ride. I ride on the hoods and there were times where I felt like I was working pretty hard for the speed that I was getting. Well for some reason, I became aware of my form on the bike, I put my knees closer together, tried to have an "idealized" pedal stroke but was still riding on the hoods. It was interesting to note that I was able to catch up and keep up with the other riders. Now Im just a 15-21 mph type of rider and I am significantly overweight (but getting smaller...). I thought how interesting it was that just a little awareness of body position, in terms of pedalling motion, was able to make a big difference.Eastway82 said:It's exponential - the faster you go, the more difference the drag makes. If you want to prove it to yourself, find a long downhill, start off sitting up like a sail, and see how the speedo ramps up as you get lower and more efficient. Just don't forget to watch the road as well...
I'm told that above 20 mph, wind resistance robs you of more energy than anything else.poky said:Assuming there is no ambient wind, at what speed should you use the drops? Similarily, if you have a tail wind is it beneficial to not use drops?
That's subjective. Up to 20 MPH the drag caused by bike weight (body weight and carry on baggage) as well as rolling resitance is probabaly the primary cause of resistance that causes expenture of energy. By the time you hit roughly 20 MPH, wind resistance is probably the primary cause of resistance. But the two aren't independant. They are additive. So...when you are riding with a tail wind the only resistance you are experiencing is bike weight and rolling resistance aided by the tail wind up until you achieve the same speed as the tail wind. After you are going faster than the tail wind, the wind resistance starts becoming a factor. It's not until you are going approx. 20 MPH faster than the tail wind that your actual speed becomes the dominate factor in resistance that robs you of energy. Dominate doesn't mean that the the original resistance is no longer present. You are still overcoming the resistance caused by bike weight and rolling resistance. Just because one becomes the primary cause of resistance doesn't eliminate the physics of the other.HenryLaRoy said:I'm told that above 20 mph, wind resistance robs you of more energy than anything else.
OldSoldier said:That's subjective. Up to 20 MPH the drag caused by bike weight (body weight and carry on baggage) as well as rolling resitance is probabaly the primary cause of resistance that causes expenture of energy. By the time you hit roughly 20 MPH, wind resistance is probably the primary cause of resistance. But the two aren't independant. They are additive. So...when you are riding with a tail wind the only resistance you are experiencing is bike weight and rolling resistance aided by the tail wind up until you achieve the same speed as the tail wind. After you are going faster than the tail wind, the wind resistance starts becoming a factor. It's not until you are going approx. 20 MPH faster than the tail wind that your actual speed becomes the dominate factor in resistance that robs you of energy. Dominate doesn't mean that the the original resistance is no longer present. You are still overcoming the resistance caused by bike weight and rolling resistance. Just because one becomes the primary cause of resistance doesn't eliminate the physics of the other.
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