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witness mark
Every bike with an AHeadset will have a witness mark from the compression ring, it's only a worry when it transitions from mark to groove
gbj_tester-
On carbon chat
Are you supposed to remove sharp edges from the edges of things coming in to contact with carbon?Ask as on motorbikes, when fitting rental bars or alloy bars that you are supposed to file the edges of the handlebar clamps as a sharp (?) edge can cause worry marks on the bars and cause the ally bars to break.
lynx
On the carbon steerer chat, I cut a ride short back in late 2021 because I felt a loose headset and couldn’t get rid of it. I’d had the 3T stem off (single torx bolt design) and had tightened to 5Nm, and was loathe to go higher than that.
So I got home, ordered a normal stem (2x 5Nm Allen bolts) and dismantled the front of the bike to clean everything up ready.
Noticed this witness mark on the steerer and sought a few opinions on fora and did some reading. Have ridden it since over the past two years (headset tight - a loose one is a pet peeve of mine) and serviced the bike in October just gone… and there is no change.
I had put it down to compression of the very top layer, but now I’m worried I should be scrapping the fork given the chat in here. FFS
EDIT - this is from the compression ring as well
EDIT 2: the 3T stem is available, but I’d only use it on a steel steerer where you can really clamp it on!