I know this is a older thread but thought I would add a little to it.
I broke these XO cranks 2 weeks ago.
They are 2 years old and I have ridden them about once a week.
I have them on a fully rigid Black Cat 29er.
It turns out my right heel wore through the carbon so thin that it caused them to snap.
This was during a short track race in Portland. I am lucky because 4 days prior I had been riding Tiger Mtn near Seattle and if they had snapped on one of the DH sections I may not be typing this. XO by gearlessinseattle, on Flickr
Do you have a pic of the non drive side arm? Is it worn like the DS arm? I'm just curious to see how worn the crank arm is. I have an XX1 crank and my shoes do rub the arms.
Amazing failures. Seriously, SRAM? I thought these cranks were awesome until I recently discovered that the pedal insert on drive side XX1 crank is loose. Not riding the bike until I get the crank replaced - but really lost confidence in SRAM carbon cranks.
Holy smokes, I have these on both my bikes. Never even thought about it being a weak point. Dayum!
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