Personally, I think the single greatest investment a cyclist or triathlete can make in his or her own performance is a professional bicycle fit. I am not saying this as a coach or even a bike fitter, but as one who has seen far too many athletes spend small fortunes on bicycles that in the end were not properly fitted to them.
A bicycle fit is essentially the proper marriage between rider and bicycle. It the past, determining the proper frame size one should ride was done using a generic formula (.647 x your inseam in centimeters), which would give you an approximation of your frame size (ie. an 85cm inseam would point to a 55cm frame size). But that method does not work as well as it has in the past.
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