Mountain Bikes| Bike Size | Rider Height | Rider Height (cm) |
| 13" - 14" | 5' 0" - 5' 2" | 152 - 158 |
| 15" - 16" | 5' 2" - 5' 6" | 158 - 168 |
| 17" - 18" | 5' 6" - 5' 10" | 168 - 178 |
| 19" - 20" | 5' 10" - 6' 1" | 178 - 185 |
| 21" - 22" | 6' 1" -6' 5" | 185 - 193 |
| 23" - 24" | 6' 4" - 6' 6" | 193 - 198 |
Sizing Guides
Choosing the correct frame size
Sizing Tips
- When you straddle the bicycle frame with your feet flat on the ground, as illustrated here, you should be able to clear the top tube (crossbar).
- Although every manufacturer has their own sizing quirks, a bike's frame size is based on the length of the seat tube (the tube that the seatpost goes into). Please see the tables below for sizing guides
- If you prefer more athletic riding, particularly mountain biking over rough terrain, you are safest with maximum clearance, so plump for the smallest possible frame - as long as you can still stretch your legs and the bike isn't so short that it cramps your riding style.
- If you like to sit upright, go for the biggest frame that still allows top tube clearance.
Calculating the correct frame size
You can get a rough idea of the size of frame you require if you measure your inside leg - crotch to floor - then subtract:
- 9" / 23cm or 10" / 25cm for a road bike (or a mountain bike used as a road bike)
- 12" / 30cm for an athletically-ridden mountain bike.
Bike sizing tables
The following tables offer a rough guide to the correct frame size to choose however it is dependent on your riding style. If you have any queries please contact our sales team on 0845 257 0808 or 0131 331 5010 alternatively you can email us.
If possible for sizing enquiries please include the rider height and inside leg measurement. Find out more detailed information on kids' bike sizing.
Mountain Bikes
Road Bikes
| Bike Size | Rider Height | Rider Height (cm) |
| 49cm | 5' 0" - 5' 3" | 152 - 160 |
| 52cm | 5' 3" - 5' 6" | 160 - 168 |
| 54cm | 5' 6" - 5' 9" | 168 - 175 |
| 56cm | 5' 9" - 6' 0" | 175 - 183 |
| 58cm | 6' 0" - 6' 3" | 183 - 191 |
| 61cm | 6' 3" - 6' 6" | 191 - 198 |
| Giant Sizing | |||
| Conventional Size (Equiv) | Compact Sizing | Rider Height | Rider Height (cm) |
| 49-51cm | XS | 5' 2" - 5' 4" | 157 - 163 |
| 51-54cm | S | 5' 4" - 5' 7" | 163 - 170 |
| 55-57cm | M | 5' 7" - 5'10" | 170 - 178 |
| 57-59cm | M/L | 5' 10" - 6' 0" | 178 - 183 |
| 58-60cm | L | 6' 0" - 6' 3" | 183 - 191 |
| 61-63cm | XL | 6' 3" - 6' 6" | 191 - 198 |
|
Merckx Cycles Sizing Like the majority of road bike manufacturers from Giant to Specialized, Merckx Cycles employ 'compact geometry'. This means that Merckx frames have sloping top tubes rather than traditional horizontal top tubes. Merckx Cycles' sizing is quoted according to the actual seat tube length - 42, 45, 48, 51 or 54cm - measured centre to centre). This might cause confusion because most other companies quote a 'virtual' seat tube length based upon how long the seat tube would have been if the frame had been built with a horizontal top tube. Hence our Eddy Reckoner If you normally ride a 51cm road bike you want a 42cm Merckx, and so on. |
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| Traditional Road Bike Sizing | Merckx Sizing | Rider Height | Rider Height (cm) |
| 51cm | 42cm | 5' 2" - 5' 4" | 155 - 163 |
| 53cm | 45cm | 5' 4" - 5' 7" | 163 - 175 |
| 56cm | 48cm | 5' 7" - 6' 0" | 175 - 183 |
| 58cm | 51cm | 6' 0" - 6' 3" | 183 - 191 |
| 60cm | 54cm | 6' 3" - 6' 6" | 191 - 198 |
Commuter & Leisure Bikes
| Bike Size | Rider Height | Rider Height (cm) |
| Extra Small 13" - 14" | 5' 0" - 5' 3" | 147 - 155 |
| Small 15" - 16" | 5' 1" - 5' 5" | 155 - 165 |
| Medium 17" - 18" | 5' 5" - 5' 9" | 165 - 175 |
| Large 19" - 20" | 5' 9" - 6' 0" | 175 - 183 |
| Extra Large 21" - 22" | 6' 0" - 6' 3" | 183 - 191 |
Touring Bikes
| Bike Size | Compact | Rider Height | Rider Height (cm) |
| 50cm | 5' 0" - 5' 3" | 152 - 160 | |
| 52cm | (46cm - 49cm compact frames) | 5' 3" - 5' 6" | 160 - 168 |
| 54cm | 5' 6" - 5' 9" | 168 - 175 | |
| 56cm | (50cm - 53cm compact frames) | 5' 9" - 6' 0" | 175 - 183 |
| 58cm | 6' 0" - 6' 3" | 183 - 191 | |
| 61cm |
BMX & Jump Bikes
BMX & Jump bikes are usually only available in one size which will suit most riders however there are some exceptions. If you are unsure please contact us on 0845 257 0808 or 0131 331 4675 alternatively you can email us. If possible for sizing enquiries please include the rider height and inside leg measurement.
Kids' Bikes
| Bike Size | Wheel Size |
| 2 - 4 years | Balance Bike |
| 3 - 5 years | 12" |
| 4 - 7 years | 16" |
| 5 - 10 years | 20" |
| 8 - 14 years | 24" |
| 11+ | 13" - 14" adult |
| More info... |
Women's Bikes
| Women's Mountain | |||
| Bike Size | Frame | Rider Height | Rider Height (cm) |
| Extra Small | 13" - 16" | 4' 9" - 5' 4" | 152 - 160 |
| Small | 5' 4" - 5' 8" | 158 - 168 | |
| Medium | 17" - 20" | 5' 8" - 6' 0" | 165 - 175 |
| Large | 6' 0" - 6' 3" | 173 - 183 | |
| Women's Road | ||
| Bike Size | Rider Height | Rider Height (cm) |
| 44cm | 4' 10" - 5' 1" | 147 - 155 |
| 48cm | 5' 1" - 5' 3" | 155 - 160 |
| 51cm | 5' 3" - 5' 5" | 160 - 165 |
| 54cm | 5' 5" - 5' 7" | 165 - 170 |
| 57cm | 5' 7" - 5' 11" | 170 - 180 |
| Giant Women's Road | |||
| Conventional Size (Equiv) | Compact Sizing | Rider Height | Rider Height (cm) |
| 47cm | 2XS | 5' 0" - 5' 2" | 152 - 157 |
| 49-51cm | XS | 5' 2" - 5' 4" | 157 - 163 |
| 51-54cm | S | 5' 4" - 5'6" | 163 - 168 |
| 55-57cm | M | 5' 6" - 5' 8" | 168 - 173 |
| 57-59cm | L | 5' 7" - 5' 10" | 170 - 178 |