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Sizing Guide

Words by Mark

on 09/09/2013 12:06:00

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Bike Size Guide

Road Bike Size Guide
Mountain Bike Size Guide
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Electric Bike Size Guide
Kids Bike Size Guide
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Which 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

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.


Bike sizing chart (Men)

Height Inside leg Men's road bike size Men's mountain bike size Men'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)

Height Inside leg Women's road bike size Women's mountain bike size Women'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. age Min. inside leg Wheel size Frog Bike size
1-2 years 24cm / 9" 10" Tadpole
2-3 years 31cm / 12" 12" 13”, 14” (X Small)
3-4 years 38-43cm / 15-17" 14" Tadpole Plus, Frog 43
4-5 years 48cm / 19" 16" Frog 48
5-7 years 52-58cm / 20-23" 20" Frog 52, Frog 55, Frog Road/Track 58
8-12 years 62-67cm / 24-26" 24" Frog 62, Frog Road/Track 67
10-14 years 69-78cm / 27-31" 26" Frog 69, Frog Road/Track 70, Frog MTB 72, Frog 73, Frog 78

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How do I measure my height?

With your shoes off, stand upright against a wall, with your shoulders back and legs together. Use a pencil to make a small mark on the wall above your head – make sure you hold the pencil parallel to the floor. Then measure from the floor to your mark, in centimetres or feet and inches.

How do I measure my inside leg length?

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).


Q & A

Do sizes vary for different bike types?

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).

I’m between sizes – which frame size should I choose?

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:

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.

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.

Are frame sizes different for women-specific bikes?

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.

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.

How are bike frame sizes calculated?

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:

ROAD_MTB_SILLHOUETTE_CM


Got a question?

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.

Find your nearest store

Still unsure what size bike you need? Pop into your nearest store and speak to our expert staff.

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