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The cranks are awesome, stiff and light. The Chainring on the other hand is a total piece of shit. I have an upper guide and even then the chain manages to drop off the bottom of the ring during a chunky section. It also wears out at an alarming rate, I have done less than 150 miles (California, so no wet days) and its making a terrible sound when loaded. I am going to fit a Sram chainring with zero offset, thats actually going to give a better chainline than the original one and it will solve the issues listed...