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MTB vs Road crankarm lengths(2 posts)

MTB vs Road crankarm lengthsDirtDad
May 12, 2002 8:12 AM
I currently run 175mm cranks both road & mtn. Most roadies w/my inseam run 172.5mm road cranks because it is better for spinning. However, I am not a true roadie, I consider myself MTB first, and road riding is commuting/cross training/fun centuries, etc. Would I be better off sticking with a 175mm for road, or should I go 172.5, perhaps to help me better focus on spinning and technique on the road?
re: MTB vs Road crankarm lengthspa rider
May 13, 2002 5:23 AM
Unless you like to experiment, stay with the 175. I started MTB racing, before I bought a road bike to help my endorance.

I see no advantage switch crank length unless you spin alot on you're MTB. Where I ride single track you're usually granny gear or middle/first gear combo to ride threw rocks. Don't see any need to be a fast spinner their. Does help on flat road areas, but just learning how to spin with a road bike helps enough.

The reason we run longer cranks is for leverage. I can run a 177.5, but found the difference is not enough to justify the change. The main issue is going back and forth on each bike and wondering why the one seems to pedal better.

You want to use a 172.5 probably will help you develop your fast twitch muscles, but I'm not sure how much you're going to see in advantage when you're climbing hills. I had a 172.5 ten years ago on my first road bike and it may have helped my spin, but I think I would have gotten the same ability by riding in group paceline rides reguardless.

You didn't say in your post how tall you are, so I based my post off of that you tall enough to have a 175 crank. If your 5'6" to 5'9" I can see how you could argue the point.

I'm sure others will givde you a better opinion.

Just my opinion. It's easier to ride both bikes with same crank length.