Mountain Bike Size Calculator Top Tube. Mountain bike frame sizes are slightly different and the units used in bike sizes vary depending on type and brand. Effective top tube is the horizontal distance from the centre of the head tube to the centre of the seat post.
Many manufacturers size road bikes by top tube length. Different styles of bikes will measure differently, but fit the same rider. ETT is a common measurement to look at when sizing a bike and is a good indicator of how long a bike will feel while you're seated.
The tables below show the frame size best suited to your height.
The smaller size was the bike of choice for riders who enjoy airtime, ride predominantly in tight and twisty terrain, or place a high value on playing with the trail.
Mountain Bike Effective Top Tube and Reach. Stand over height is the clearance between the top tube and the bottom of your crotch. Mountain Bike Sizing Guide When buying a bike, the fit is the most important factor when it comes to comfort—and the more comfortable you are, the more likely you are to keep riding.