Bike Sizing Guide

Adult and childrens' bike sizing guide

Please feel free to call our team on 0330 100 2480 if you would like additional advice.

Sizing image

Off-road mountain bike

When riding off-road it is important to have a slightly smaller frame than you would for normal road riding. This is for 2 reasons, firstly to increase the amount of clearance you have over the crossbar to a minimum of 3 inches and secondly, a smaller frame will handle better over more challenging terrain. This will put you in a slightly more forward position with seat-post height extended.

Rider Height Inside Leg Frame Size Suggested
ft & ins ins ins
4.10+ 26 - 28 13
5.0+ 27 - 29 14
5.2+ 27 - 29 15
5.4+ 28 - 30 16
5.6+ 28 - 30 17
5.8+ 29 - 31 18
5.9+ 29 - 31 19
5.10+ 30 - 32 20
6.0+ 32 - 34 21
6.2+ 33 - 35 22
6.4+ 34 - 36 23

Back to top

Full-suspension mountain bike

The range of frame sizes available for full suspension models are usually smaller than rigid front suspension bikes. the main consideration here is to make sure the rider meets the minimum height and inside leg requirements and has the clearance over the crossbar.

Rider Height Inside Leg Frame Size Suggested
ft & ins ins ins
5.4+ 28 - 30 16
5.6+ 28 - 30 17
5.8+ 29 - 31 18
5.9+ 29 - 31 19
5.10+ 30 - 32 20

Back to top

Jump mountain bike

This is the BMX of the mountain bike world and generally used for stunt riding. This requires a minimum of 3 inches clearance over the crossbar.

Rider Height Inside Leg Frame Size Suggested
ft & ins ins ins
5.0+ 27 - 29 14
5.2+ 27 - 29 15
5.4+ 28 - 30 16
5.6+ 28 - 30 17
5.8+ 29 - 31 18
5.9+ 29 - 31 19
5.10+ 30 - 32 20

Back to top

Comfort mountain bike

Designed to give maximum comfort without the drag of knobbly tyres for the road. Only a 1-2 inch clearance is required over the crossbar to put you in a balanced position between the seat and handlebars, maximising comfort. Suspension Seat-post Models: Take 1” off the frame size you require.

Rider Height Inside Leg Frame Size Suggested
ft & ins ins ins
4.10+ 26 - 28 13
4.10+ 26 - 28 14
5.0+ 27 - 29 15
5.2+ 27 - 29 16
5.4+ 28 - 30 17
5.6+ 28 - 30 18
5.8+ 29 - 31 19
5.9+ 29 - 31 20
5.10+ 30 - 32 21
6.0+ 32 - 34 22
6.2+ 33 - 35 23

Back to top

Traditional hybrid bike

Only a 1-2 inch clearance is required over the crossbar to put you in a balanced position between the seat and handlebars maximising comfort. Suspension Seat-post Models: Take 1” off the frame size you require.

Rider Height Inside Leg Frame Size Suggested
ft & ins ins ins
5.0+ 27 - 29 15
5.2+ 27 - 29 16
5.4+ 28 - 30 17
5.6+ 28 - 30 18
5.8+ 29 - 31 19
5.9+ 29 - 31 20
5.10+ 30 - 32 21
6.0+ 32 - 34 22
6.2+ 33 - 35 23

Back to top

Sports hybrid

Only a 1-2 inch clearance is required over the crossbar to put you in a balanced position. However due to the style of this model you will be in a slightly more forward riding position. Suspension Seat-post Models: Take 1” off the frame size you require.

Rider Height Inside Leg Frame Size Suggested
ft & ins ins ins
5.0+ 27 - 29 15
5.2+ 27 - 29 16
5.4+ 28 - 30 17
5.6+ 28 - 30 18
5.8+ 29 - 31 19
5.9+ 29 - 31 20
5.10+ 30 - 32 21
6.0+ 32 - 34 22
6.2+ 33 - 35 23

Back to top

Road bike

Sizing is all-important here as the rider is in a straight-line aerodynamic position. Only a 1-2 inch clearance is needed.

Rider Height Inside Leg Frame Size Suggested
ft & ins ins ins cm
5.1+ 27 - 29 18 48
5.3+ 28 - 30 19 50
5.5+ 29 - 31 20 52
5.7+ 30 - 32 21 54
5.9+ 31 - 33 22 56
5.11+ 32 - 34 23 58
6.2+ 33 - 35 24 60

Back to top

Choosing the right bike for your child

Kids' bikes are usually advertised by their wheel size unlike adult bikes which are usually measured by frame size. Our children's bicycle guide tells you more about the differences between the sizes in kids' bikes as a child grows. The general guide is:

Children's Sizing Guide
Rider Age Suggested Leg
Years Wheel Size Inches
3 - 5 years 12" 13.5 - 16"
4 - 6 years 14" 15 - 17.5"
5 - 8 years 16" 17 - 20.5"
6 - 9 years 18" 19 - 23"
7 - 10 years 20" 21 - 25"
8 - 11 years 24" 23.5 - 27"

Junior bike with stabilisers

When riding a bike with stabilisers it is not essential that the rider is able to touch the floor as the bike is supported. However the rider must to be able to get on/off the bike safely.

Rider Age Inside Leg Size Suggested
Years Ins Frame Wheel
2.5 - 4.5 13 - 15 n/a 12"
3.5 - 5.5 15 - 17 n/a 14"
4.5 - 6.5 17 - 19 n/a 16"
5.5 - 7.5 19 - 21 11" 20"
5.5 - 7.5 20 - 22 12" 20"
5.5 - 7.5 21 - 23 13" 20"

Back to top

Junior novice bicycle

If the rider has recently progressed from stabilisers then it is more important to ensure that they have a solid footing on the floor, which will allow their confidence to grow.

Rider Age Inside Leg Size Suggested
Years Ins Frame Wheel
4.5 - 6.5 18 - 20 n/a 16"
5.5 - 7.5 20 - 22 11" 20"
5.5 - 7.5 21 - 23 12" 20"
5.5 - 7.5 22 - 24 13" 20"
7.5 - 11.5 25 - 27 14" 24"
7.5 - 11.5 26 - 28 15" 24"

Back to top

Junior proficient bicycle

Within a few months riding on 2 wheels the rider only needs to have the ball of their foot on the floor to maximize growing room and ensure safety.

Rider Age Inside Leg Size Suggested
Years Ins Frame Wheel
4.5 - 6.5 17 - 19 n/a 16"
5.5 - 7.5 19 - 21 11" 20"
5.5 - 7.5 20 - 22 12" 20"
5.5 - 7.5 21 - 23 13" 20"
7.5 - 11.5 24 - 26 14" 24"
7.5 - 11.5 25 - 27 15" 24"

Back to top