Yeah sorry no picture is unhelpful, unfortunately I'm at home and the bars aren't. The groove is definitely mechanical, bike has barely been used! It literally looks like someone has popped a pipe cutter round the bars and given it a single turn, can feel it with your nail, black paint is broken.
I'd be certain the bars are original so the OD should be a match for the stem, so over or under tightened seems the cause. Thanks for your replies, I'll hang them up in the shed and get some replacements. The drop shape is very... marmite anyway!
Yeah sorry no picture is unhelpful, unfortunately I'm at home and the bars aren't. The groove is definitely mechanical, bike has barely been used! It literally looks like someone has popped a pipe cutter round the bars and given it a single turn, can feel it with your nail, black paint is broken.
I'd be certain the bars are original so the OD should be a match for the stem, so over or under tightened seems the cause. Thanks for your replies, I'll hang them up in the shed and get some replacements. The drop shape is very... marmite anyway!
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