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Request a Call BackWhich size bike do I need?
To work out the right bike frame size for you, all you need is:
- Your height
- 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 |
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:
Got a question?
If you have any questions about bike sizing, our expert team is here to help. Call us on 0330 555 0080 7 days a week, use our Live Chat, or email bikesales@rutlandcycling.com.
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