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Bike sizes — what do they mean?

When you see a bike that says that it’s 21” (or 56cm; usually road bikes are measured in cm and mountain, hybrid and kids bikes in inches), that measurement refers to the distance from the top of the seat tube (rather than the seat) to the center of the bottom bracket. The first step in figuring out if a bike fits you is to stand over the top tube (as though you were riding the bike and stopped at a light). You should have 1-2 inches of clearance between you and the top tube. There are many aspects of bike fit, standover height is just the beginning. This article goes into depth about different fits for different types of bikes. If you’re wondering how you can get your bike to fit better, bring it in and talk to one of us!