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Crank 170, 172.5 or 175?(7 posts)

Crank 170, 172.5 or 175?sievers11
May 22, 2002 5:58 PM
I like a small frame so I got a fuji team 54, this is spec'ed with a 170 Ultegra crank. Most places online that suggest a fit for a complete recomend the 54 frame but also a 172.5 or 175 crank. Am I hurting my self (speed & mechanical advantage) by having a 170 crank. Should I think about replacing, stick with the same or possibly get a little larger cassette?

I can do a 360 degree turn at 25 mph, all while pedaling, but I am not racing in crits, so the turning is not a big deal. I do like to stomp up hills, and generally cruz at 20-22 mph.

Lastly, I would just like some advice / pros and cons. I would just as soon no have to get a new crank just to play around with the length, but???

Stay at 170 unless you have a reason to change it.Ahimsa
May 22, 2002 6:13 PM
Like knee pain or something.

If it ain't broke....

I guess, but...sievers11
May 22, 2002 6:37 PM
Unfortunatly, sometimes I have to try out the wrong way to convice myself the right way is correct.
won't go wrong...weiwentg
May 22, 2002 7:19 PM
I'm 5'3", and I put 175s on the road bike. worked fine. now, though, they're on the cross bike - 170s going on the road bike.
re: Crank 170, 172.5 or 175?weiwentg
May 22, 2002 6:47 PM
you've touched on the clearance issue. aside from that, common lore holds that shorter cranks are better in flats and TTs because you can spin them more easily. the leverage of longer cranks is advantageous in climbs. and if you're a masher, I suppose.
Try Them All And See What You Like BestBigLeadOutGuy
May 22, 2002 6:55 PM
there is only one way to find out which crank length you like better...try out all lenghts and see what you general a shorter crank will let you spin smoother and quicker but you will have less torque. But there are many theories out there that say differnt...Im 6`4`` ride a 64 frame and I feel that 172s give a smother spin for time trials but for climbing id much rather be using 180s
its all personal preference.
Crank Lengthcyclinseth
May 23, 2002 5:55 AM
I recently attended a bike fitting seminar with Serotta's NYC bike rep, Paul Levine (?). Serotta, far and away has the most indepth and bio-mechanically advanced bike fitting procedure. I personally ask this same question: "What criteria determines what length crank to use?"

His reply: "Use what you are used to."

He said that Mapei racing team did a very lengthy and costly experiment to determine what crank length best suits what riders, and thier results showed that there was no appreciable difference in performance between the three common crank lengths per given test subject.

So there you go, I'm saving my $180 and sticking with my 170mm.