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@hma
i have no idea :S
never had integrated cranks before - recently bought a pair of truvativ rouleurs to try them out.
this is what i managed to find:
"As you can see to the left, there are a few bearing variations of Mega Exo; Light, Regular, and Quad. Each works with specific cranks." (from bikeman.com)
i think i read that gxp is not compatible with other systems.. if there is an expert here, please share the knowledge!