Cycle Size Guide: Wheel Size and Frame Size by Height and Age
Updated 2026-11-01
A wrong-sized cycle is uncomfortable and unsafe, whatever the spec sheet says. Use these ranges as a starting point, then test the fit.
Kids: wheel size by age
Approximate guide, children vary by height. Pick by inseam first, age second.
- 12 inch: about 2 to 4 years
- 14 inch: about 3 to 5 years
- 16 inch: about 4 to 6 years
- 20 inch: about 6 to 9 years
- 24 inch: about 8 to 11 years
Adults: MTB frame size by height
Approximate ranges for a mountain bike frame, in inches:
- Up to about 5'3" (160 cm): 13 to 14 inch
- About 5'3" to 5'7" (160 to 170 cm): 15 to 16 inch
- About 5'7" to 5'11" (170 to 180 cm): 17 to 18 inch
- About 5'11" to 6'2" (180 to 188 cm): 19 to 20 inch
Adult wheel size
26 inch suits shorter riders and is common on budget cycles. 27.5 inch suits most adults. 29 inch rolls over bumps better and suits taller riders. Road and hybrid cycles often use 700C, close to 29 inch.
Quick fit check
- Standing over the top tube you should have 2 to 5 cm of clearance.
- With the pedal at the bottom, your leg should have a slight bend at the knee.
- Handlebar reach should not strain your back or shoulders.