Maximising speed

ryanshane

Just Joined
Sep 26, 2007
2
0
Does anyone have any methods or ideas on what could be done to maximise the top speed of the bike (cheap and nasty methods?).

Is there any way to make a normal road bike more areodynamic, other than leaning down while riding, or putting the electric motor on a recumbent bike instead?
 

flecc

Member
Oct 25, 2006
53,152
30,567
None of the attempts at cowlings have succeeded in doing this, the added weight combined with the relatively small influence of air drag at low speeds meaning no overall gain, though purely on the flat there could be a gain.

As you'll have seen, triangular and oval sections have been used on frame tubes, forks and rims to minimised drag, but the gain in road use is vanishingly small.

The real villain of the piece is the rider, the drag from that necessary accessory being many times that of the bike.

And the nearest to an answer to that is a slim athletic shape covered with tight fitting uncreased lycra and the like, together with an airflowed helmet and goggles. Then with training to use the optimum limb/body profile to the airflow, the best is attained.
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keithhazel

Esteemed Pedelecer
Oct 1, 2007
997
0
is there a photo of this from above to get an idea of what it looks like,i know its not but could just be a flat picture..ha ha..seriously i know its not, but it looks very cool...
 

flecc

Member
Oct 25, 2006
53,152
30,567
I was surprised that my tongue-in-cheek description took so long to be commented on! :D
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coops

Esteemed Pedelecer
Jan 18, 2007
1,225
1
Manchester U.K.
I've been looking at cycle clothing lately, and to help reduce drag from the rider, without quite resorting to lycra, I've found that one can get windproof cycling jacket & hiking/climbing trousers which are very slim fitting, slippery-ish material & both breathable & water repellant too: combined with a thin but warm base layer such as merino wool top & leggings, this makes a very comfortable, lightweight, slimline, water repellant & fairly 'slippery' setup, clothing wise at least - I'm afraid I can't help with the slim, athletic build aspect... :eek: :D. There is some possible weight loss involved though :), depending what you normally wear when cycling - a lightweight wool top & windproof jacket (plenty warm enough even in the cold) can weigh as little as around 130-150g each, and trousers probably not much more, so thats a total clothing weight (excluding shoes, helmet etc.) of around say 7-800g or so, which feels very light indeed! - On the bike I keep feeling I must have left something behind, its so light! :)

I think even with a slippery & slimline rider 'outline' the correct rider position still makes most of the difference, and that doesn't look too comfortable to me, so I'll maybe settle for much slimmer & slipperier with a slightly improved aero ride position (at least you feel faster when you're more streamlined & in lightweight clothes :D).

SPDs can also be used to increase speed, about 1 or 2mph or so, if you want to work more :).

Stuart.
 

giguana

Pedelecer
Nov 8, 2007
216
0
the human shape is about 80% of the wind resistance so you should try growing a pot belly...tape your ears backward with masking tape, and glue some little perseus wings to the back of your shoulders...would probably be faster.