The horizontal distance from the pedals (bottom bracket) to the handlebars. A longer reach feels more "stretched out" and aggressive.
If you are between sizes, or comparing different brands, look at "Reach" and "Stack" on the bike's geometry chart. bike buying guide size
Mountain and hybrid bikes are typically sized in inches or categorical sizes (S, M, L). 5'0" – 5'4": 14 – 15 inches (Small) 5'5" – 5'8": 16 – 17 inches (Medium) 5'9" – 6'0": 18 – 19 inches (Large) 6'1" – 6'4": 20 – 21 inches (XL) 2. Measure Your Cycling Inseam The horizontal distance from the pedals (bottom bracket)
If you are on the cusp, sizing down is usually safer as it offers better control and maneuverability. Sizing up is better if you prefer a more stable, less "twitchy" feel. Mountain and hybrid bikes are typically sized in
Kids' bikes are sized by rather than frame height. 12-inch: Ages 2–4 (approx. 2'10" – 3'4") 16-inch: Ages 4–6 (approx. 3'7" – 4'0") 20-inch: Ages 6–9 (approx. 4'0" – 4'5") 24-inch: Ages 8–11 (approx. 4'5" – 4'9") Pro-Tips for Buying
The vertical height from the pedals to the handlebars. A higher stack puts you in a more upright, comfortable position. 4. Sizing for Kids