# How To Measure What Size Bike You Have

### Record the tire diameter as this also represents the bike frame size.

How to measure what size bike you have. 1 with your child standing with his back against the wall align the book vertically on the wall between your child s legs up to the crotch area. You can calculate or use the bike size charts below. To measure the inseam you need a yardstick and a medium sized book. The bike size is measured from where the seat post starts and to the crank.

To size a bike you ll need to take your inseam measurement. What size do kids bikes come in. Kids bikes come in these different wheel sizes. If you have straight fork legs without an angle at their crown the angle of the legs will be the same as the head tube angle so you can measure this instead.

If you look near the bottom of this tube about 3 inches 7 6 cm up from the chain sprocket you ll see a glued on label that states the bike s frame size. After all bikes come in all shapes and sizes so learning how to measure for a bike is important to ensure you ride away on the model that s right for you. Getting the right size bike if you re in the market for a new bike knowing what size bike you need can really come in handy. It is fairly simple.

Ideally you ll know your bike size before you buy. To measure your bike s frame size take a measuring tape and place the tape in the center bolt of your bike s cranks. When you reach the end of the seat tube you have your frame size. If it is just the frame this will be the center point in the bottom bracket shell.

Again it s important to have the. So if you don t know what size bike do i need here are the answers. If the size isn t given you ll need to measure the seat tube manually. Stand with your feet 6 inches apart then measure from the inside of your foot up to your crotch where your leg meets your waist.

Measure the diameter of the existing tire as illustrated above d or look on the tire for the size it looks like this. Sometimes however there are other ways. Now run the measuring tape up your seat tube. It ll make the whole process easier and you ll be set up for success right from the beginning.

12 inch 14 inch 16 inch 18 inch 20 inch 24 inch and now even 26 inch. Methods if you don t know how to measure a bike. If you are sizing a mountain bike measure in inches them multiply your inseam by 67 and subtract 4 inches. If you find the tire size the first dimension is the tire diameter the second dimension is the tire thickness.

The kids bike sizing guide below will give you an overview of the various kids bike sizes and show you how to choose the best size bike for your child.