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Choosing the size of your bike
It is very important to choose the correct size when buying a new bike. If a bike is too small it can feel uncomfortable to ride as it will be very cramped and you may not be able to adjust your saddle to a suitable height for pedaling efficiently.
If a bike is too large it can be dangerous to ride as you will not have proper control and may hit the top tube of the frame during an emergency stop. You may also develop strain injuries from being too stretched out when you ride a bike that is too large for you.
Please get in contact with us on 01403 258474 or email info@freeborn.co.uk if you are unsure of the size you require and require some expert advice!
Children’s Bikes
These are generally sized using wheel diameter. It is important to choose a bicycle that fits your child now, rather than buying a larger bike for them to grow into, as this can be dangerous for them to ride and may put them off cycling for life.
| Age range | Wheel size |
| 2-3 years | 12” |
| 3-5 years | 16” |
| 5- 7 years | 20” |
| 7-10 years | 24” |
Adult’s Bikes
These are generally sized using frame size, with allowances made for different types of bike.
Men’s and Women’s specific geometry on bikes is becoming a thing of the past. Leg length to body length to arm length varies hugely from person to person, regardless of sex.
Mountain bikes typically have a smaller frame with more saddle extension to give extra clearance between you and the bike frame which makes the bike more maneuverable on rough terrain.
Road bikes typically have a larger frame with less saddle extension as less clearance is required between you and the bike when used on the smooth road
Hybrid bikes typically fall between mountain bikes and road bikes for sizing, with ‘sport’ road models closer to road bike sizing and ‘multi-use’ (road / off-road) models closer to mountain bike sizing
We have created generic sizing charts below for different bike styles. However, different brands and models of bike can size differently. In most cases we have included specific size guides on each model of bike shown on our website.
Mountain Bike Sizing
| Frame size | Height | Height (cm) |
| 13” – X Small | 4’10” – 5’2” | 152 – 158 |
| 15” – Small | 5’2” – 5’ 6” | 158 – 168 |
| 17” – Medium | 5’6” – 5’10” | 168 – 178 |
| 19” – Large | 5’10” – 6’1” | 178 – 185 |
| 21” – X Large | 6’1” – 6’7” | 185 – 193 |
| 23” – XX Large | 6’ 5” – 6’ 7” | 193 – 200 |
Road Bike Sizing
| Frame size | Height | Height (cm) |
| 44 cm – XX Small | 4’ 8” – 5’0” | 143 – 152 |
| 48 cm – X Small | 5’ 0” – 5’ 3” | 155 – 160 |
| 52 cm – Small | 5’ 3” – 5’ 6” | 160 – 168 |
| 54 cm – Medium | 5’ 6” – 5’ 9” | 168 – 175 |
| 56 cm – Large | 5’ 9” – 6’ 0” | 175 – 183 |
| 58 cm – X Large | 6’ 1” – 6’3” | 183 – 191 |
| 61 cm – XX Large | 6’ 3” – 6’ 6” | 191 – 198 |
Road Hybrid Bike Sizing
| Frame size | Height | Height (cm) |
| X-Small | 5’ 0” – 5’3” | 152 – 160 |
| Small | 5’ 3” – 5’ 6” | 160 – 168 |
| Medium | 5’ 6” – 5’ 9” | 168 – 175 |
| Large | 5’ 9” – 6’ 2” | 175 – 188 |
| X-Large | 6’ 1” – 6’6” | 188 – 198 |
Multi Surface Hybrid Bike Sizing
| Frame size | Height | Height (cm) |
| Small | 4’ 10” – 5’ 2” | 152 – 158 |
| Medium | 5’ 3” – 5’ 6” | 160 – 168 |
| Large | 5’ 6” – 5’ 9” | 168 – 175 |
| X-Large | 5’ 9” – 6’ 2” | 175 – 188 |
| XX-Large | 6’ 3” – 6’ 6” | 188 – 198 |