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Q? If you have 2 identical bikes, one with 175mm cranks & one...(7 posts)

Q? If you have 2 identical bikes, one with 175mm cranks & one...SGrouts
Aug 4, 2002 1:25 PM
... with 172,5mm cranks, with which of the 2 is harder to pedal assuming that you have the same chainring-cog combination?

2. With which you can achieve the higher max speed???

3. With which you can climb easier at high hils?

Answer simple as 1, 2, 3Kerry
Aug 4, 2002 3:19 PM
Each is equally easy to pedal, each gives you the same max speed, each gets you up the hill with the same amount of effort. Crank length is a personal preference, and in a blind test, very few people could tell the difference between a 172.5 and 175 crank. While many will claim they notice a difference, this is not done as a blind test, and so is most likely placebo effect. There is no valid testing that has ever shown a benefit to any particular crank length, regardless of body (leg, femur, etc.) size. The only (probably) agreed upon thing about crank length is that longer cranks = slower cadence, pretty much in proportion to length (about 3 rpm slower per 5 mm increase in length).
slower cadencecyclopathic
Aug 5, 2002 7:10 AM
interestingly I ride 170 and 175mm cranks and I spin faster on 175. avg RPM is higher, not sure about max.
re: Q? If you have 2 identical bikes, one with 175mm cranks & one...phlegm
Aug 4, 2002 3:52 PM
The longer cranks will give you more leverage. Try this link

Shorter cranks are a bit easier to spin and less likely to catch on the ground on a hard turn.

Like Kerry said, crank length won't make a difference with max speed or ease of hill climbs. Either way, you must put out the same amount of energy.
The differencejromack
Aug 4, 2002 4:58 PM
The difference between a 175 and a 172.5 crank is .09 inches, about the thickness of 3 credit cards stacked together.

Applying the same force to each crank results in a whopping 1.45% increase in torque using the longer crank.
1% is huge at the pro level. (nm)nova
Aug 4, 2002 5:16 PM
depends on 1% of what nmcyclopathic
Aug 5, 2002 7:37 AM