I had one combination that, as you say, both stated 27.2 mm but the difference was significant. If that is the issue it's not clear to me how to resolve it.
Cheers for the idea.
I fear the only way may be a new bike... Good excuse as any for one right?
Heading out for an evening spin now, so will be paying close attention to it... It has to be something fixable.
@SternsCycles started
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I had one combination that, as you say, both stated 27.2 mm but the difference was significant. If that is the issue it's not clear to me how to resolve it.