How to Choose the Right Bike Size – Manufacturer Guide
Selecting the correct frame size is essential for comfort and performance. Use the chart below to find the recommended frame size based on your height in centimeters:
Selecting the correct frame size is essential for comfort and performance. Use the chart below to find the recommended frame size based on your height in centimeters:
Recommended frame size by rider height
| 163 – 170 cm | 52 (S) |
|---|---|
| 171 – 177 cm | 54 (M) |
| 178 – 184 cm | 56 (L) |
| 185 – 191 cm | 58 (XL) |
| 192 cm and above | 61 (XXL) |
The same size groups apply to every bike in our fleet — Specialized and Trek use the frame number (52–61), Wilier uses the letter (S–XXL). The size filter on our Rent a Bike page uses exactly these ranges.
How to Calculate Your Frame Size
The most reliable shortcut uses your inseam length (inner leg, floor to crotch, measured without shoes): multiply it by 0.665 to get your road bike frame size in centimetres. Example: an 82 cm inseam × 0.665 ≈ a 54–55 cm frame. Your ideal saddle height is roughly inseam × 0.883, measured from the centre of the bottom bracket to the top of the saddle.
Between two sizes? Riders who value agility and a sportier position usually take the smaller frame; riders who prioritise comfort on long days take the larger one. Reach can always be fine-tuned with the stem — frame size cannot.
When you rent with Doctor Bicycles, you don’t have to worry about any of this alone: tell us your height, weight and saddle height during booking, and every bike is set up for you (saddle height, saddle position, tyre pressure) before we hand it over — at the shop or at your hotel door.
Please note: These sizes are general recommendations. Tell us your saddle height when you book and we set the bike up for you (saddle height, saddle position, tyre pressure).