Bike Size Guide - Measurements
 

Bike Size Guide

We've brought together all the Smalls, Mediums, Larges (& more) to give you a definitive guide to actual bike measurements. As there are a wide range of bike types and manufacturers, you may want to check out the more detailed size guides below.


Find the right size bikes and clothing for you

 

What size bike do I need?

To work out the right bike frame size for you, all you need is:


1. Your height


2. Your inside leg length


Then, use the size charts below to match your measurements to the manufacturers recommended frame size. This is the same for both bicycles and electric bikes. Remember, all sizing information is a guide only. If you have any questions about bike sizing, our expert team is here to help. Call us on 0330 555 0080, use our Live Chat, or email us on ridersupport@rutlandcycling.com. Our Rider Support team are available Monday-Friday 09:00-17:00..


Bike sizing chart (Men)

HeightInside legMen's road bike sizeMen's mountain bike sizeMen's hybrid bike size
147cm-152cm / 4'10"-5'0"66cm / 26"47, 48cm (XX Small)13" (X Small)13", 14" (X Small)
152cm-160cm / 5'0"-5'3"69cm / 27"49, 50cm (X Small)13", 14" (X Small)14", 15" (X Small, Small)
160cm-170cm / 5'3"-5'7"71cm / 28"51, 52, 53cm (Small)15", 16" (Small)15", 16" (Small)
170cm-175cm / 5'7"-5'9"76cm / 30"54, 55cm (Medium)17", 18" (Medium)17", 18" (Medium)
175cm-180cm / 5'9"-5'11"79cm / 31"56, 57, 58cm (Large) (Giant - ML)18", 19" (Medium, Large)19", 20" (Large)
180cm-188cm / 5'11"-6'2"81cm / 32"59, 60cm (X Large)19", 20" (Large)20", 21" (Large, X Large)
188cm-196cm / 6'2"-6'5"86cm / 34"60, 61, 62cm (X Large, XX Large)20", 21", 22" (Large, X Large)21", 22" (Large, X Large)
196cm+ / 6' 5"+91cm / 36"62, 63cm (XX Large)23", 24" (XX Large)23", 24" (XX Large)

Bike sizing chart (Women)

HeightInside legWomen's road bike sizeWomen's mountain bike sizeWomen's hybrid bike size
147cm-155cm / 4'10"-5'1" 66cm / 26"44, 45, 46cm (XX Small)13", 14" (X Small)13", 14" (X Small)
155cm-160cm / 5'1"-5'3"69cm / 27"47, 48, 49cm (X Small)13", 14" (X Small)14", 15" (X Small, Small)
160cm-165cm / 5'3"-5'5"71cm / 28"50, 51, 52cm (Small)15", 16" (Small)15", 16" (Small)
165cm-172cm / 5'5"-5'8"76cm / 30"53, 54, 55cm (Medium)17", 18" (Medium)17", 18" (Medium)
172cm+ / 5'8"+79cm / 31"56, 57cm (Large)19" (Large)19" (Large)

Bike sizing chart (Kids)

Approx. ageMin. inside legWheel sizeFrog Bike size (view more)
1-2 years24cm / 9"10"Tadpole
2-3 years31cm / 12"12"13", 14" (X Small)
3-4 years38-43cm / 15-17"14"Tadpole Plus, Frog 43
4-5 years48cm / 19"16"Frog 48
5-7 years52-58cm / 20-23"20"Frog 52, Frog 55, Frog Road/Track 58
8-12 years62-67cm / 24-26"24"Frog 62, Frog Road/Track 67
10-14 years69-78cm / 27-31"26"Frog 69, Frog Road/Track 70, Frog MTB 72, Frog 73, Frog 78

How to measure yourself

how to measure yourself for bike clothing and bikes

How A Bike Frame Is Measured

The length of the down tube (seat tube), from the top (where the seat post inserts), to the centre of the front chainring, is used to determine a bicycle's frame size. This is usually given in Inches.

how a bike frame is measured

Bike Measurement FAQs

Yes - road bike sizing is usually in centimetres, and mountain bikes in inches. Some manufacturers use a S/M/L system instead.Children's bike sizes are based on wheel size (eg. for Specialized and Scott), or on inside leg length (Frog Bikes).

If your measurements suggest that two bike sizes are suitable, then in the end it's a personal choice - here are some rules of thumb to consider: For road bikes - choose the smaller size. It is possible to make a smaller frame bigger (for example, by raising the saddle or fitting a longer the stem), whereas if the frame itself is too big for you, it's likely to be less comfortable and less efficient. For Mountain bikes - choose the larger size. You'll find a mountain bike with a slightly larger frame easier to handle than one that feels cramped. You can always fit a shorter stem if necessary, to reduce the reach to the handlebars.

Yes - for example, a Medium women's road bike will be smaller than a Medium men's road bike. However, the sizing itself is calculated in the same way, so a 54cm men's and women's bike have the same frame size. Some manufacturers also change other aspects of frame geometry on a women-specific bike, to offer women a better fit. For example, women tend to have shorter upper bodies than men, so women's bikes can have shorter top tubes (the horizontal or sloping tube running between the handlebars and the saddle), to reduce the reach to the handlebars.

A bike's frame size is calculated by measuring the length of the down tube (seat tube), from the top of the tube (where the seat post inserts), to the centre of the front chainring.

To work out the right bike electric frame size for you, all you need is:\n\nYour height\nYour inside leg length\nThen, use the size charts below to match your measurements to the manufacturers' recommended e-bike frame size

With your shoes off, stand upright with your back against a wall. Place a book/ruler between your legs, level with your crotch. Then measure from the floor to the top of the book/ruler, in centimetres or feet and inches (it's easier if a friend helps).

Some brands use a S/M/L system, some use inches, and others use cm. The table below includes all of these variations, to help you find the right size and compare across brands. Wheel sizes sometimes vary between sizes, too, with smaller wheel sizes used with the smaller frame sizes.

If your measurements suggest that two e-bike sizes are suitable, then in the end it's a personal choice - here are some rules of thumb to consider: Road and Hybrid E-bikes - choose the smaller size. It is possible to make a smaller frame bigger (for example, by raising the saddle or fitting a longer the stem), whereas if the frame itself is too big for you, it's likely to be less comfortable and less efficient. Mountain E-bikes - choose the larger size. You'll find a mountain e-bike with a slightly larger frame easier to handle than one that feels cramped. You can always fit a shorter stem if necessary, to reduce the reach to the handlebars.

Yes - for example, a Medium women's electric bike will be smaller than a Medium men's e-bike. However, the sizing itself is calculated in the same way, so a 54cm men's and women's e-bike will have the same frame size. Many e-bikes have unisex sizing. NB. Some manufacturers also change other aspects of frame geometry on a women-specific bike, to offer women a better fit. For example, women tend to have shorter upper bodies than men, so women's bikes can have shorter top tubes (the horizontal or sloping tube running between the handlebars and the saddle), to reduce the reach to the handlebars. Many manufacturers are now focusing less on gender and more on height as a comfort metric.

An electric bike's frame size is calculated by measuring the length of the down tube (seat tube), from the top of the tube (where the seat post inserts), to the centre of the front chainring - exactly the same way a traditional bike is.

 

Author

Nik Hudson
23/08/2022