There's a lot of info on the web about crank length. I read a lot of
it and changed from 172.5 mm to 170 mm cranks on my y-foil and found
it easier to mantain a 100 rpm cadence for a longer period. I wear
pants with an inseam of 31 (trousers with an inside leg of 31 for the
Brits) ... Which is 33 when checking for crank length as you measure
to the ground ... I thought it strange that Lance would have an
inseam of 33 and he is only 5' 10" and I'm 5' 11" and that's why. My
TT bike had 175 cranks and when I switched to 170 I averaged 5 more
rpm over the same routes. They say it's all about femur length and not
inseam so if you really want to be comfortable, find a good bike shop
and have a fitting.

Andy

On Jul 3, 2008, at 7:18 PM, Raymond Landa <RaymondLanda@...>
wrote:

>
> Larger frame means smaller seat post. It has nothing to do with
> crank length. The larger frame has a longer distance between the
> bottom bracket and the seatpost mount. Crank length is about your
> leg length and how you feel comfortable with. If you have a 32"
> inseam, you might want to consider starting with a 172.5mm crank.
>
>
>
>
>
>
>
>
> Thank you for the information. When I thought about it I was not
> sure if I was thinking the right way. I'm going to a larger bike so
> it makes sense I would need a bigger crank cause of my shorter
> legs. 32inch inseam=180mm crank.--- On Thu, 7/3/08, Raymond Landa
<RaymondLanda@...
> > wrote:From: Raymond Landa <RaymondLanda@...>Subject: RE:
> [yfoil] Parts questionsTo: yfoil@...: Thursday, July
> 3, 2008, 3:37 PMI'll try to answer the crank length question to some
> extent. And yes, there is no difference except length. And although
> longer weighs more and has more of a propencity to flex, if you need
> a longer crank, YOU NEED A LONGER CRANK! So don't worry about that.
> It use to be, when someone asked what length to use, the answer was
> always the same: 170mm. However, some people began to question this
> and there philosophy is: not everyone has the same leg length. Short
> leg = short crank. Long legs work better with longer crank. And it
> all comes down to your inseam. The way you measure your inseam is:
> 1) Get someone to help you. 2) stand with your back up against a
> wall barefoot. 3) Have your friend place a ruler up between your
> legs to mark the top. 4) Measure the distance to the top of that
> ruler. That is your inseam legth. With that, google some websites
> and you will see that some people have there own belief as to what
> your crank length should be. I have a 33 inch inseam and a 175 seems
> to work for me. I have seen websites that recomend 180mm but I
> haven't tried it yet. If I remember correctly, one website
> recomended a 170mm for someone with a 31 inch inseam. And then there
> is preference. In any case, measuringyour inseam and matching your
> crank length to it is a good starting point. Now don't quote me on
> this one but I think Lance Armstrong has a 33 inch inseam and he
> uses a 175mm. Hmmmm.To: yfoil@yahoogroups. comFrom: cro2112@yahoo.
> comDate: Thu, 3 Jul 2008 21:15:28 +0000Subject: [yfoil] Parts
> questionsSo I am fixing to put some parts on my new 77, but I have
> some questions! Theres a lot of stuff I never even thought of!!LOL I
> will get the hard one out of the way first, crank length. I have
> seen them from 160mm to 180mm. What is the difference, other then
> the length? Should I use longer cranks because I have shorter legs?
> Or does it really matter? Next is the bottom bracket, I am using
> dura ace cause it goes with the crank. Do I need English or Italian?
> And what about the width, left to right are the all the same? Front
> derailleur, braze on? Matching with a twin ring front crank at 53
> teeth. Thats enough questions for now! Thanks Dave ____________
> _________ _________ _________ _________ _________ _Don't get caught
> with egg on your face. Play chicktionary!http://club. live.com/
> chicktionary. aspx?icid= chick_wlhmtextli nk1_feb[Non-text portions
> of this message have been removed][Non-text portions of this message
> have been removed]
>
>
>
>
>
> _________________________________________________________________
> Watch “Cause Effect,” a show about real people making a real differe
> nce. Learn more.
> http://im.live.com/Messenger/IM/MTV/?source=text_watchcause
>
> [Non-text portions of this message have been removed]
>
>
> ------------------------------------
>
> Yahoo! Groups Links
>
>
>