PRACTICAL GUIDE · 5 MIN READ
Why a medium bike is not always your size
Use the exact model chart and keep every overlapping size on the shortlist.
Everyday Bike Fit product guide · updated 2026-09-21 · Independent fitter review pending.
Start with the full identity
A size label belongs to a specific model and generation. “M”, “54” and “18 inches” are not universal equivalents. A wheel label such as 700c or 29 inches describes the wheel, not the frame fit.
Find the model name, frame-size marking and wheel option. The manufacture year can stay unknown. What matters for chart matching is whether the published generation and wheel variant really describe your bike.
Read the chart as published
Measure height and inside leg barefoot. Where the manufacturer pairs these ranges, both measurements must fit the same published band. If they point to different sizes, remeasure and ask for individual advice.
Overlapping ranges should produce multiple starting sizes, not an automatic rule to size up or down. An open-ended band needs extra confirmation. A list of available sizes without body ranges cannot produce a personal recommendation.
Compare the position, not just the badge
Frame stack and reach describe the steering-tube position relative to the bottom bracket. They do not include the whole handlebar or forearm-pad setup. Different stems, bars and seats change the contact points.
For TT bikes, check the attainable pad position. For mountain bikes, include standing control and dropper clearance. For everyday bikes, include easy mounting and brake access. Try the exact shortlisted size where possible and confirm any return terms before buying.