I am going to defend the non-monostay AA Super which is also not at all flexible at the top of the seat stays. Besides, if it was going to flex it would be while your weight was on it.
@Five-Hats started
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I am going to defend the non-monostay AA Super which is also not at all flexible at the top of the seat stays. Besides, if it was going to flex it would be while your weight was on it.