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Looks to be standard GXP afaik - it's self extracting so 10mm is for the outer cap bit and 8mm is for the bolt which goes into the axle.
So basically this but from somewhere with it in stock: https://www.sjscycles.co.uk/chainsets/sram-crank-arm-bolt-m15-m26-alloy-selfextracting-gxp-black/
zooeyzooey
Haha wow, OK.
If I knew how to figure out what cranks I had I wouldn't be posting here. Never owned a bit of sram in my life before, always had shimano. All I know is that they are sram red, 110bcd, hidden bolt, 170mm long and with a purple splash of colour near the end of the cranks. I didn't think any of that info would be useful or I'd have shared it here already.
I guess this info prob says what it needs but I couldn't really parse it properly.
Does it mean I can use two different sizes of bolt? 10mm or 8mm?