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@germanmarc
i have few track bikes now, most of them have a tighter rear triangle and i have to spread it to get the rear wheel in. one is wider and gets compressed when tightened. at two of them the spacing is exact 120mm. all of them are set with the same gear ratio.
the bikes with the exact 120mm somehow feel "tired" when riding.
could the spreading/compressing the rear triangle act in a stiffer more responsive ride ?