# How Do I Know Bike Frame Size?

To determine the frame size of your bike, take a measuring tape and insert it into the center bolt of your bike’s cranks. Repeat this process for each crank. It will be the center point in the bottom bracket shell if the frame is all that is missing. Now, run the measuring tape up the seat tube of your vehicle. When you get to the end of the seat tube, you’ll know what frame size you need.

The frame is now measured from the center of the crank axle to the top of the seat tube by the majority of manufacturers. The majority of road bicycles are measured in centimetres (cm), but mountain bicycles are often measured in inches (in) (in). The size of a child’s bicycle is determined by the size of the wheels rather than the frame.

## How do I know what size my bike is?

Taking a look towards the bottom of this tube, around 3 inches (7.6 cm) up from the chain sprocket, you will notice a glued-on label that indicates the frame size of the bicycle. While not all bicycle frames are labeled with their size, if yours is, it will save you time and effort. If the seat tube size is not specified, you will need to physically measure the seat tube.

## How do you calculate bike frame size?

1 bicycle frame for city/trail riding Trekking frame size equals inseam multiplied by 0.64 2 frames for road bicycles Road frame size = inseam multiplied by 0.67 This is the formula developed by Cyrille Guimard, a well-known French coach and former professional cyclist, in the 1980s. 3 mountain bike frames are available.

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## Do all bike frames have a size label?

While not all bicycle frames are labeled with their size, if yours is, it will save you time and effort. If the seat tube size is not specified, you will need to physically measure the seat tube. Keep in mind that the frame size may be specified in either inches or centimeters depending on the manufacturer.

## What is the best frame size for a road bike?

Your ideal frame would be something that is 19′′ under the XL size. You’ll need frame sizes in the 56-57-58 centimeter range under the Large category. Your sweet spot is at number 57. Dear Sir or Madam, I’m interested in a vintage Raleigh road bicycle from the 1950s with a 22-inch frame.