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PhilDAS
@farewell
So a futher update to my Sram S300 cranks and gxp bottom bracket (6 weeks old/1250miles) about issue...
Took the bike to Evans, explained the issue and they used a torque wrench to check the cranks are tight. Then they noticed the play can only really be felt in one orientation of the cranks. They said its most likely the axle and not the bb, but the bb could be ovalised.
I can feel and hear clicking in the cranks/bb when pushing down on the drive side pedal on every other rotation. Possibly the chainring moving slightly throwing the chainline off?
Seems my options are: buy a new gxp bb and see if that sorts the issue or buy a new crankset?