Crank Length for TTing

brettjmcc

I am not the tallest guy in the world being only 5'7" and an inside leg of 77cm.

Now when I put that into the computer on competitive cyclist it says for an Aero fit, my cranks should be 172.5mm; however, if I use the L(mm)=2.16xl(cm) I should be using cranks of 166mm!

My current bike has 172.5mm cranks and it feels fine, and I can regularly spin up past 110, but I also don't know anything different. So what is the benefit of going the other way, or even if I got a crank of 175mm would it really matter?

The frame I will be putting them into will be a Quintana Roo CD01 small. Thanks

meesterbond

I remember Michael Hutchinson saying in CW a while back that he didn't feel it made a blind bit of difference, within reason.

He's a lot faster than I'll ever be, so since then I've never paid a whole lot of attention to whether I've got 175 or 172.5mm cranks. In fact, thinking about it, I don't even know what size I'm using at the moment.

danowat

Common question....

http://www.timetriallingforum.co.uk/ind ... opic=60834

There are loads of posts about it on TTF

cougie

i doubt youd notice.

i certainly couldnt tell you the crank length of a bike just by riding it.

Berk Bonebonce

Sums are not the way to get correct crank length. Do not listen to anyone who thinks that they are. You only get correct crank length by trying different sizes, or buying a chainset with adjustable length.

simon_e

Spend your money on something you know will make a difference.