I have an 07 Tarmac Expert with stock carbon steerer fork. Less than 1k mi with no crashes. On the road the other day (somewhat rough chip-n-seal pavement- no pothole hit) the stem slipped just a little (5 degrees or so). Stopped to check it on roadside & it seemed OK. Road home slow. Pulled the stem (stock Pro Road multi position). The carbon steerer has shallow but distinct grooves into the resin- probably from the stem shim (used with Spec mulit-position stems). NO cracks are visible. Stem was orginal install from a trusted LBS.
Is this marking normal with the multiposition stems & carbon steerers?
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Thread: Carbon steerer groove
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