175mm vs 170mm cranks

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12/13/2012 6:42 PM

I been on the fence about if i should buy some 170mm crank arms, specially with holiday sales. I run 175mm for the longest time and very successful with them. This switch is because of a knee injury on left leg and i thinking the 170 would make it easier to pedal. I run 170 on my mtn bike and can feel the diff when on bmx with longer 175. There is a speed advantage and my racing background telling me stay 175. The street trickin part and injury telling me to go with 170. I know this is pure prefference and up to opinion. If you have any opiniins to share much appreciated. I broke as hell so would like to stay 175 and like the speed factor. Injuries and time can make you rethink certain parts on your bike.

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12/13/2012 6:43 PM

i used to ride 175 and now run 170 ..i didnt feel a difference

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12/13/2012 6:45 PM

If you run back peg(s) you have more clearance of your foot hitting, as well as giving you more torque with your pedal stroke. It's like losing 1 tooth on your sprocket, but with a slightly closer stance as well. I'm thinking of going to 170's when I get Fit Indents.

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12/13/2012 6:47 PM

Yeah I went from 175 to 170mm didn't feel a different eihther. Just cooler saying its 170 not 175

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12/13/2012 6:49 PM

I've always ran 175mm cranks all my life. I ran some 165mm and that was definately different. And yes, running 175mm cranks, your heel will sometimes hit the rear peg.

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12/13/2012 6:51 PM

i have huge ass feet so my foot hits my peg either way

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12/13/2012 6:56 PM

um if i am correct, running 170 will make it harder to pedal because you have less leverage.

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12/13/2012 7:28 PM
Edited Date/Time: 12/13/2012 7:28 PM

sketo wrote:

um if i am correct, running 170 will make it harder to pedal because you have less leverage.

true. 170mm are shorter so you have less leverage, but since its short it moves a shorter distance for the same RPM of a longer crank arm. its more of a proportion rather then a preference.

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12/14/2012 6:05 AM

sketo wrote:

um if i am correct, running 170 will make it harder to pedal because you have less leverage.

This, aha. I cant beleive a lot of you guys thought shorter arms meant easier.

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12/14/2012 9:18 AM
Edited Date/Time: 12/14/2012 9:24 AM

Ya there advantages to both sizes and this why it a hard decision for me. Trying not to let finances mess with my parts purchase. I def feel the extra thrust factor with longer arms and agree that similar to having extra tooth of gear. I had similar heel clearance with back peg issue but usually only happens when i messing up riding. I old now so only doing bunny hop 3s and high speed gaps. My top tube long enough so never hit toe to front with 175. I guess the only thing holding me back is if there is a distinct balance advantage to the 170? I have 170 on my dh bike and xc bike but hard to tell how it would effect the bmx bike. I think it has to do with your riding style and tricks you into. If doing alot of bar spins and slow speed tech moves then 170. If into high speed long reach gaps maybe 175 better. Has anyone switched from 175 to 170 and feel a real balance or jumping advantage?

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12/14/2012 1:11 PM

shishka wrote:

Ya there advantages to both sizes and this why it a hard decision for me. Trying not to let finances mess with my parts ...more

i did..and i have a short top tube and a huge foot so sometimes my foot hits my peg and front wheel..but when i switched..i didnt really notice a difference..just get them.i promise you will love them

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12/14/2012 1:16 PM

It's easier to pedal with longer crank arms
You might not feel the difference but it helps a little if you ride 4 pegs
I also depends on your back end

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12/14/2012 2:30 PM

i run 170s and i love it

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12/14/2012 3:27 PM

It seem like 170 gettig more popular now because almost all companies offer them. Just a couple years ago it was only 175 or 180 thats it. I might give it a try but still feel like 175 the standard for dj and high speed style of riding. Can def see advantage of 170 for a tech street scenario.

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The bigger the bust the better the boost.

12/14/2012 4:05 PM

yeah im justbshort so i decided to give 170mm a try

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12/14/2012 5:20 PM

There's actually less choice in crank sizes than there used to be. The short crank arm craze is more likely to do with shorter rear ends + 4 pegs

Longer cranks make it easier to pedal/more pedal pressure. Shorter cranks have the opposite effect

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12/14/2012 5:22 PM

I used to run 170 and now i run 175 and i feel pretty much no diference

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virginia beach ~ instagram: @_harru_ ~ 4pegz

12/14/2012 8:28 PM

If you already have crank arms that aren't broken then the answer is simple. Don't waste money on new crank arms for 5mm. It's not going to cure anything. This could be the difference in putting your feet further apart on the pedals if you're only talking about distance between your feet/legs. This just seems like one of the biggest wastes of money.

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12/14/2012 10:22 PM

damn, i might go to 170's just to run 4 pegs

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12/15/2012 9:06 AM

NextGenesis88 wrote:

If you already have crank arms that aren't broken then the answer is simple. Don't waste money on new crank arms for 5mm. It's ...more

Ya i agree, that exactly why I hesitating on the purchase and looking for more reasons to convince myself its a good move. I one of those riders that dont fix until it broke. The other reason i consider the switch is from a knee/hip injury that was making it hard to pedal. The 170mm have a shorter path to travel so might ease up leg pain. The injury is improving though and i do love the added power of longer arms. I also must add that I a short mofo at 5'7". I was checking pro builds all night and most have switched to 170 and even 165. There are still a ton of pros rocking 175 it really a prefference thing. My style is all about speed to overcome obsticals so i might stick with the 175s afterall. Dont really have luxury of buying two sets of arms these days. Had these 175s in action for 10 years and still rock solid. Got to love the profiles.

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The bigger the bust the better the boost.