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170 or 175 mm cranks for singlespeed mtb?(12 posts)

170 or 175 mm cranks for singlespeed mtb?JS Haiku Shop
Jan 12, 2004 11:31 AM
ok this is not the ss, fixed, or mtb forum. but i would rather ask you bunch of random electrons. i'm 6' and it's a 20" mtb, being built ss. my choices are cheap 170 or a little cheaper 175, and they're both about the same quality. price is within $5, so irrelevant.

I have 170 on my fixed gear and 172.5 mm on my others. i'm actually on the fence between "it matters" and "5 mm is so small that i will never tell the difference."

but i know so little about mtb riding that of course i'm blinded by inexperience.


re: 170 or 175 mm cranks for singlespeed mtb?Mel Erickson
Jan 12, 2004 11:39 AM
Cadence lower, grunt factor higher, go with 175.
175 mm or longerlaffeaux
Jan 12, 2004 11:50 AM
SS MTB is all about grunting up hills in a gear that is completely wrong for the conditions. Get as long a lever arm as you can.

175mm cranks arms are pretty standard on a geared MTB that you'd ride. I'd certainly not go smaller than that.
175 for sureclimbo
Jan 12, 2004 12:06 PM
no smaller, any bigger and you'll have clearance to ground issues but many ride 180's for the extra leverage. I'm 6'0" also, ride a large frame and 175's on my SS. Momentum and spinning can help on a SS also. ou know little about MTB riding but are starting with a SS? What gearing/ratio are you looking to use?
re: ratio etcJS Haiku Shop
Jan 12, 2004 12:09 PM
32/14. i've been singlespeeding for 2 years, fixed riding for 1 year, all road. been riding mtb since 1997, but not much in the last 2 years.

re: ratio etcclimbo
Jan 12, 2004 12:13 PM
nice, that's a big gear ! I run a 32x18 or 32x19 here in the NE, I'd never make the climbs in a 32x14. SS is great fun though!!
it's a place to startJS Haiku Shop
Jan 12, 2004 12:23 PM
14 = there is no climbing around here to speak of, but i'd guess on having a 16t and 18t around for variety.


re: 170 or 175 mm cranks for singlespeed mtb?FTMD
Jan 12, 2004 12:11 PM
175's are the standard mtb length. Some of my ss'ing buddies go with 180 and don't bash rocks, etc., so it works for them. I'm firmly of the thought that it doesn't matter. Yeah, maybe it's nice to have the longer crank on the hills, but I do ride stuff other than hills and I find the 175's spin easier on the flatter stuff. Rather than looking at it from the perspective of what's right, look at it from the perspective of your riding style. Do you spin or mash? Which do you prefer?
mashJS Haiku Shop
Jan 12, 2004 12:22 PM
thanks. i figured it would come down to riding style, but was hedging the decision with other stuff mentioned here, like bashing rocks, being in the neutral position, clearing stuff, and the short/severe climbs encountered on some trails. guys have brought me around to the 175s.

175 it is. thanks, guys. vioxx, here i come. nmJS Haiku Shop
Jan 12, 2004 12:22 PM
re: 170 or 175 mm cranks for singlespeed mtb?weatherx
Jan 12, 2004 2:09 PM
mtb ss'er here. I used to think longer is better, but:

1) more leverage can be achieved using a smaller ring or a bigger rear cog

2) so for uphill, you can get the same leverage regardless of arm length.

3) but--shorter arms are easier to spin--when it's too much a downhill to spin comfortably on longer cranks, you can spin on shorter ones.

4) shorter arms give you more ground clearance.

now i'm not so sure.
180 all the wayredglobal
Jan 13, 2004 5:06 AM
I'm 6'1" and have a 19" SS MTB.