Most brands follow these general height-to-size correlations: Rider Height Frame Size (Alpha) Frame Size (Inches) 4'10" – 5'2" 13" – 15" 5'3" – 5'6" 15" – 17" 5'7" – 5'10" 17" – 19" 5'11" – 6'2" 19" – 21" 6'3" and up Source: Retrospec , Cycrown
: This determines how stretched out you feel. A longer reach provides more stability at high speeds, while a shorter reach makes the bike more nimble and easier to flick around.
If your measurements place you between two sizes, choose based on your riding style:
To buy the right mountain bike size, start by matching your and inseam to the manufacturer's specific size chart , as sizing often varies between brands. While standard "alpha" sizes (S, M, L) are common, the frame's reach —the horizontal distance from the pedals to the handlebars—is the most critical metric for how the bike handles while you are standing and maneuvering off-road. General Mountain Bike Size Chart