How to Pick the Right Frame Size of Mountain Bike

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To pick the right mountain bike for your body type, select a frame size that allows at least five to seven inches of seat post sticking out with the proper leg extension, as well as two to four inches of clearance between your body and the top tube. Learn how to choose the frame that fits you best in this free video on mountain bike maintenance.

Part of the Video Series: Mountain Bike Maintenance
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Video Transcript

Hi, my name is John from Competitive Edge Cyclery in Upland, California, and I'm going to be showing you some sizing tips on how to fit a mountain bike. When choosing the proper size mountain bike, you want to make sure of a couple things. You want to make sure that you have at least five inches of seat posts to seven inches of seat posts sticking out with the proper leg extension. You're going to also want to have two to four inches of clearance between you and the top tube. So, when you're standing flat-footed over it, you want to lift it up and have about that much clearance. You can see I don't. Basically you want to have the seat posts, when you're sitting on the bike you want to have almost full extension at the bottom with your heels down. This bike is a little bit too big for me. I'm going to use a medium, and that's going to fit me better. If you do not have full extension of your leg, if you have too high it's going to want to pull the joint apart in your knee. If it's too low, you're not going to use the full leg muscle. So, you want to make sure that you're fitted properly to every bike that you ride. You want to make sure that you talk to somebody who knows what they're talking about when it comes to sizing a bike. If you get the wrong size bike, it's always going to be the wrong size. There's not much you can do to fit the proper frame after you've bought the bike. So make sure you contact somebody who you trust that will sell you a bike that is the right size. Thank you. Hopefully that's been helpful.


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