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Join Date: Feb 2012
Location: Rochester, NY
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Bikes: Stewart S&S coupled sport tourer, Stewart Sunday light, Stewart Commuting, Stewart Touring, Co Motion Tandem, Stewart 3-Spd, Stewart Track, Fuji Finest, Mongoose Tomac ATB, GT Bravado ATB, JCP Folder, Stewart 650B ATB
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The non drive side crank arm's fit to the axle sees greater loads and more back and forth loads then the drive side does. remember that the drive side arm is directly connected to the chainrings/chain. So all it's drive forces go through the chainring/arm construction and very little is seen by the axle/arm fit. Additionally remember that the vast majority of riders don't really pull up on the back stroke, so the other arm will drive the back stroke arm up via the axle fit. The non drive side sees both these forces with each stroke. The drive side sees mostly only the force to pull up the non drive side. Andy
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AndrewRStewart