Sizing evidence

Use a manufacturer size chart together with fit context; a nominal size alone is not a fit recommendation.

Use size-specific geometry

A bike's reach, stack, effective top tube, seat tube length and standover can change from one size to the next. Review the actual row for the intended size instead of applying the dimensions from a neighboring size.

Fit remains personal

Rider proportions, flexibility, contact points, intended terrain and riding position all matter. A geometry chart can support a conversation with a qualified fitter, but it cannot determine a safe or comfortable fit by itself.