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steel road, fixie, & MTB
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Discussion Starter #1 (Edited)
What is BB drop measures and how does BB drop affect a fixie's handling, esp. turrning/cornering?

Bottom Bracket drops:

Soma Rush is 58mm
and
Surly Steam Roller is 70mm
and
IRO Mark V is 50mm


what's the BB drop a Bianchi Pista?

(assume 55 or 56 frame)
 

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BB drop is the distance the BB is below the imaginary line connecting the front and back drop outs. A smaller drop helps increase pedal clearance at the expense of a higher center of gravity. Keirin lore also contends that smaller drops favor acceleration while bigger drops favor top end speed.
 

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steel road, fixie, & MTB
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Discussion Starter #3
170 or 165mm crank's also a good ideal?

tobu said:
BB drop is the distance the BB is below the imaginary line connecting the front and back drop outs. A smaller drop helps increase pedal clearance at the expense of a higher center of gravity. Keirin lore also contends that smaller drops favor acceleration while bigger drops favor top end speed.
thanks, tobu

ah, so a short BB drop (say 5cm) is a "good" thing for a fixie, as to lessen the likely hood of smacking the pedal while cornering.

then is going with a 170 or 165mm crank's also a good ideal? (I'm 5'10)
 

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It used to be that pretty much everyone ran 165mm on track bikes, but that's changing. Pedal clearance was one of the issues on steep tracks at low speeds on bikes with greater BB drop. The modern trend to push bigger gears has convinced some riders that running longer cranks give you more leverage when out of the saddle. I don't think running 170 is a bad thing, and as long as you don't get a bike with the BB drop in the 70's you should be all right.
 
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