165 Cranks...who runs them?

I've got 165mm cranks but they came standard on my 54cm Fuji Track. I'm small...

I have 172.5 on my (main) road bike and 165 on fixed. But I'm 5'6; I would change the road ones to 165s but they're Record and pretty.

Most couriers run 165 on the left and 180 on the right. Come on, hipsters, fall in line.

165mm cranks is the fixed-gear fashion. 172.5mm is what I run on my road bike. I don't notice the difference through my legs but 165mm is definitely better for cornering on fixed-gear.

That's bollocks will and you know it. Only the really fast couriers do that.

i cant tell the differences between my 165s and 170s i mean, what is 5mm after all?

half a cm last time i checked

Most couriers run 165 on the left and 180 on the right. Come on, hipsters, fall in line.

so you can prop your bike on the kerb, right?

172.5 on road, 165 on fix.
just because.

half a cm last time i checked

I reckon it is 5x10e-3 metres.

165 to 170 is 10 mm more diameter, 31.4159... mm more pedal movement per revolution, or your feet moving about 3% faster for the same rpm, which means your feet would have 6% more kinetic energy.

[QUOTE=wiganwill;542627]Most couriers run 165 on the left and 180 on the right. Come on, hipsters, fall in line.

so you can prop your bike on the kerb, right?[/QUOTE]

no, crank length affects gear ratio - the 180 is a low gear for pulling away quickly, and the 165 for zooming along.

^ would it not be 9% because kinectic energy is proportional to the angular frequency velocity squared?

^ would it not be 9% because kinectic energy is proportional to the angular frequency velocity squared?

no - if the old speed was v, the new speed is 1.03 v and the KE changes from 1/2 M v^2 to 1/2 M (1.03 v)^2 = 1/2 M 1.03^2 v^2 = 1/2 M 1.0609 v^2

^

Thanks, Middle School Maths Mistake there.

no - if the old speed was v, the new speed is 1.03 v and the KE changes from 1/2 M v^2 to 1/2 M (1.03 v)^2 = 1/2 M 1.03^2 v^2 = 1/2 M 1.0609 v^2

So, does that mean the 5mm makes a big difference, and we should be worrying about getting the perfect crank length, or can we assume the 5mm is a small distance so the difference it'll make will also be small?

^

It means you should ride your bike and not worry about it.

165 fixed 175 road. 32" inside leg.

right or left fiddy?

Now riding 165's (for last couple of days) have ridden 170's before that for two years, 175's before that for ever.

Swapped 175 ->170 because of knee trouble. 170 more comfortable because less range of motion.
Swapped 170 -> 165 because new bike came with them, but notice the difference mainly when out of the saddle, it's easier to maintain a smooth circular motion with the smaller cranks.

When sitting, 165's feel much like 170's apart from slightly harder to pedal for same gear ratio (due to less moment - obviously).

Another thing: first impressions on going downhill fast, there's less tendency to bounce around in the saddle with shorter cranks.

Hope this helps.

165's on the commuter, 170's on the beater. Don't really notice much difference.

It means you should ride your bike and not worry about it.

*I *Don't, someone we both know does, though ;)

Basically... everyone here has an opinion, but know one really knows.

Myself included.

[165 & 170ish both fixed]

I know. I choose to remain silent on the matter.

sssshhh.