I had a chance to ride my usual track for a bit over 10 miles yesterday evening. I revisited the same routes and can honestly say that the 155mm crank arms are an improvement over the 170mm stock ones.
The benefit of not having to move my entire leg over such a large stroke is a great benefit not only for my knees, but for the sake of efficiency. I'm still getting the same gear inches, but cycling with less leg movement per stroke seems to give me a bit more endurance.
Looking back after having tried the 155mm crank arms, the 170's seemed to have wasted a lot of energy on the upstroke. Though the cycling shoes provide more efficiency through the entire stroke, the upstroke (when my knees come up towards my chest) still puts less power to the pedals.
If I ever go shorter, it'll be to the 152mm arms that come on the Schlumpf drive as an option. I can't really imagine myself liking anything shorter. 135mm seems ridiculously short. Still curious though.
The benefit of not having to move my entire leg over such a large stroke is a great benefit not only for my knees, but for the sake of efficiency. I'm still getting the same gear inches, but cycling with less leg movement per stroke seems to give me a bit more endurance.
Looking back after having tried the 155mm crank arms, the 170's seemed to have wasted a lot of energy on the upstroke. Though the cycling shoes provide more efficiency through the entire stroke, the upstroke (when my knees come up towards my chest) still puts less power to the pedals.
If I ever go shorter, it'll be to the 152mm arms that come on the Schlumpf drive as an option. I can't really imagine myself liking anything shorter. 135mm seems ridiculously short. Still curious though.
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