How do you measure the size of a bike?

Bikes are measured by their seat tube length. This measurement is normally from the centre of the bottom bracket (BB) or the centre of the bolt that attachs the crank arms. This differs by brand, some measure to the top of where the top tube meets the seat tube, or even the centre of the top tube.

How do I know what size my sons bike is?

How to Measure a Kids Bike

1. 1 Measure the diameter of the existing tire, as illustrated above (D), or look on the tire for the size (it looks like this: nn” x n.n”).
2. 2 If you find the tire size, the first dimension is the tire diameter, the second dimension is the tire thickness.

How do you measure a kids bike?

Kids bikes come in sizes measured by wheel diameter, as opposed to adult bikes which are measured by frame size and seat height. Common wheel diameters for children’s bikes are 12, 16, 20, and 24 inches. By comparison, adult mountain bike wheel sizes typically start at 26 inches.

How do you measure a bike wheel in inches?

Hold the end of the tape measure against the center of the bicycle wheel, and extend the tape in a straight line to the outer edge of the tire. For traditional sizing, double the inches to find the bike tire diameter.

Can adults ride 20 inch bikes?

Adults can definitely ride 20-inch BMX bikes, but it is recommended that they wear appropriate safety gear to keep themselves safe. This type of bike can be more difficult for adults than other types of bikes because the smaller wheels require a lot more balance and coordination in order to ride safely.

Can a 6 year old ride a 20 inch bike?

A 20 inch bike is generally the best fit to buy for 6 and 7-year-olds. If your child is already 8 or is a very tall 7-year-old, also consider 24-inch bikes as they would offer more room for growth. If a child starts on a 20 inch bike when they are 6 or 7, they can likely continue to ride it while they are 8 years old.

What size bike is best for a 5 year old?

A 16-inch bike is typically the best bike size for five-year-old or six-year-old children depending on their height. This 16-inch bike includes a freewheel and hand brakes which take kids a step closer to an adult bike. The Hedgehog’s hand brakes are durable and small – designed for little hands.