To the delight of professional bike fitters (and DIY’ers), Purely Custom offers a tool called the X/Y, which helps take the guess work out of adjusting the correct fore and aft of one’s saddle, as well as calculating proper stem length too.
The X/Y tool makes use of metal slides, which feature etched measurements and built-in bubble levels, to accurately dial in a rider’s correct saddle position in the overall scheme of bike fit. In addition, the tool can also help determine what length stem a rider should use, along with proper “stack” and “reach”.
The X/Y sells for $295, and it can be purchased directly through Pure Custom.
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