rudi-h Posted July 24, 2014 Posted July 24, 2014 truth is it doesn't matter on a road bike, unless you are going to the alps to ride some tour de france passes... I have a heavy road bike (>10kg) and manage 35km/hr average on races. Its the skinny wheels and the position that make a road bike fast, not so much the weight
jcza Posted July 24, 2014 Posted July 24, 2014 Read this article by Cervelo discussing Aero vs Weight - http://www.cervelo.com/en/engineering/thinking-and-processes/weight-vs-aero.html
rouxtjie Posted July 24, 2014 Posted July 24, 2014 This road business is very complicatedyou have no idea....white skoens, shaved chest, aero this, skinsuite that. Underachiever and nonky 2
Iwan Kemp Posted July 24, 2014 Posted July 24, 2014 Totally true unless you riding up the Alps daily Still not true. To get the benefit of aero on a road bike you need to average a certain speed. Before that rolling resistance plays a bigger roll. Also need to factor in momentum, rotating mass and a couple of other factors. Take a 29er wheel which we all know rolls better than a 26er and maintains speed better. The offset? Slow to accelerate. It's been proven that if you go too slow on a 29er you don't have enough inertia to get into the benefit zone of the 29er and in fact it becomes HARDER to pedal and maintain speed as each pedal stroke takes more effort than it would with a 26er. ChUkKy, Oufy MTB (Roadie) and Captain Fastbastard Mayhem 3
Gen Posted July 24, 2014 Posted July 24, 2014 you have no idea....white skoens, shaved chest, aero this, skinsuite that. So no baggies ever? nonky 1
rouxtjie Posted July 24, 2014 Posted July 24, 2014 truth is it doesn't matter on a road bike, unless you are going to the alps to ride some tour de france passes... I have a heavy road bike (>10kg) and manage 35km/hr average on races. Its the skinny wheels and the position that make a road bike fast, not so much the weightI think you are not giving enough credit to your road crank....that to me defines a road or mtb.
Captain Fastbastard Mayhem Posted July 24, 2014 Posted July 24, 2014 (edited) eish 200Watts will get you about 26km/h on tar EEK!!! EDIT: No WONDER I was fooked on the Argust. Average 298 watts on a FLAT surface to maintain 30kph. And that's on 1.75" tires!!! Edited July 24, 2014 by cpt armpies mayhem rouxtjie 1
rouxtjie Posted July 24, 2014 Posted July 24, 2014 So no baggies ever?Oh koot nooooo, as in never....ever. That simply wont fly
jcza Posted July 24, 2014 Posted July 24, 2014 Summary for the lazy readers: "Col de la Tipping Point" How steep does a climb have to be before the weight savings trump the aero gains? As we saw before, the answer depends on the rider weight and speed, as a faster rider would encounter higher aerodynamic forces while the gravitational forces stay the same. For an average, 250 Watt rider, the tipping point is around a 5% slope, for a good pro who puts out 400 Watt, it’s at 8%. What is 8%? Alp D'Huez is 8%.
rouxtjie Posted July 24, 2014 Posted July 24, 2014 EEK!!!Yoh....300W....meneer one word good luck. Captain Fastbastard Mayhem, DIPSLICK and nonky 3
jcza Posted July 24, 2014 Posted July 24, 2014 Still not true. To get the benefit of aero on a road bike you need to average a certain speed. Before that rolling resistance plays a bigger roll. Also need to factor in momentum, rotating mass and a couple of other factors. Take a 29er wheel which we all know rolls better than a 26er and maintains speed better. The offset? Slow to accelerate. It's been proven that if you go too slow on a 29er you don't have enough inertia to get into the benefit zone of the 29er and in fact it becomes HARDER to pedal and maintain speed as each pedal stroke takes more effort than it would with a 26er. Prove this to yourself: Run up a flight of stairs. Then run up a flight of stairs carrying a wheel. Finally, run up a flight of stairs carrying a spinning wheel. You get the idea: The weight of the wheel, spinning or not, has very little effect compared to what it takes to accelerate your body.The other and more important reason the effects of rotation matter little is because we don't accelerate much. If you are doing kilos on a velodrome, then worry about it. Maybe. But in the typical 40K bike leg, we accelerate exactly once, with an additional partial acceleration at the turnaround. You can't even measure the effects.
Wannabe Posted July 24, 2014 Posted July 24, 2014 (edited) Still not true. To get the benefit of aero on a road bike you need to average a certain speed. Before that rolling resistance plays a bigger roll. Also need to factor in momentum, rotating mass and a couple of other factors.Take a 29er wheel which we all know rolls better than a 26er and maintains speed better. The offset? Slow to accelerate.It's been proven that if you go too slow on a 29er you don't have enough inertia to get into the benefit zone of the 29er and in fact it becomes HARDER to pedal and maintain speed as each pedal stroke takes more effort than it would with a 26er. For some reason I knew that a 29'er will not work for me!!! :whistling: Edited July 24, 2014 by Wannabe
Gen Posted July 24, 2014 Posted July 24, 2014 Oh koot nooooo, as in never....ever. That simply wont fly Well that sucks.. Are you allowed to talk to a random stranger during a race?
Iwan Kemp Posted July 24, 2014 Posted July 24, 2014 (edited) http://img7.imageshack.us/img7/1504/dragw.png Edited July 24, 2014 by Iwan Kemp Captain Fastbastard Mayhem, GaryvdM and nonky 3
Recommended Posts
Create an account or sign in to comment
You need to be a member in order to leave a comment
Create an account
Sign up for a new account. It's easy!
Register a new accountSign in
Already have an account? Sign in here.
Sign In Now