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2 comments
Is there still a gap between the top of the steerer and the top of the stem? The stem should be 5mm max above the steerer. You might need another spacer. Is the new headset the same model as the old one? A different stack height could be the issue.
Yeah I had put another thin spacer on top of the stem to do that but didn't seem to help.
Fortunately someone in my office is a bit more competent with bikes than me and has resolved it...
Turns out the top half of the headset that sits on the top tube was too tight and not allowed to turn freely. Using this (slightly obscure) internal headset washer it has pushed it up just a fraction of a millimetre and voila problem solved.