• 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.

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