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Old 03-12-19, 08:07 AM
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Location: Brighton, Michigan
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Bikes: Optima Baron LR, '14 Nishiki Maricopa,'87 Trek 330 Elance, '89 Miyata 1400, '85 Peugeot PGN10, '04 Fuji Ace, '06 Giant Rincon, '95 Giant Allegre, '83 Trek 620, '86 Schwinn High Sierra

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165mm vs 170mm cranks for Randonnuering

So I have two cranksets lying around in my shed. FSA Omega 170mm with the Megaexo BB, and a Shimano 105 165mm crankset with its BB. The weight differences aren't much. The FSA set is about 150g heavier. I am wondering if the extra mechanical advantage of the extra 5mm negates the extra weight.
Though my legs are shorter than average, I usually don't have any knee problems with 170mm cranks. I originally bought the 165mm cranks based off recommendations because of my shorter stature. For short rides, either set works great. But with a 200k ride, the wrong choice could lead to a longer day near the 100 mile mark.
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