Bike size calculator
Enter your height, and your inseam if you know it. You get one size to start with and the reason; the detail is underneath.
Your inside leg: floor to crotch, in bare feet. How to measure it with a book and a wall.
Your inseam points to L: your legs are long for your height, and the frame has to fit your legs.
M also fits. Your height alone says M. It’s shorter and nimbler, with a lower top tube.
How we worked it out
- Height 5′9″ (175 cm)M band, 170–178 cm
- Inseam 33″ × 0.66555.7 cm frame: L
Saddle height and standover
- Saddle height to start29.1″ from the centre of the cranks to the top of the saddle (inseam × 0.883)
- StandoverAbout 2.5 cm (1″) of clearance over a level top tube, 5 cm (2″) over a sloping one
Use the kids’ bike size chart: it sizes by inseam and wheel size.
Enter your height to see a size.
Shop your size
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What size am I at each brand?
Showing road and gravel bikes, the type you picked.
- Generic road chartRoad and gravelMM 170–178 cm
- Specialized TarmacRoad, frame size54 or 5654 170–175 cm · 56 175–180 cm
- Specialized DivergeGravel, frame size54 or 5654 170–178 cm · 56 175–180 cm
- Canyon EnduraceRoadSS 170–177 cm
- Trek Domane ALRoad, frame size5656 174–180 cm
- Giant Defy AdvancedRoadMM 172–180 cm
- Cannondale SynapseRoad, frame size51 or 5451 165–175 cm · 54 170–180 cm
- Scott SpeedsterRoad and gravelMM 170–178 cm
- Orbea OrcaRoad, frame size5353 173–179 cm
- Liv Avail ARRoad, women’sLL 171–182 cm
- Specialized RockhopperMountainM or LM 163–178 cm · L 175–185 cm
- evo, all brandsMountainMM 169–178 cm
- Trek MarlinMountainM or MLM 165–177 cm · ML 173–180 cm
- Giant TalonMountainMM 169–179 cm
- Specialized CrossroadsHybridM or LM 165–175 cm · L 175–183 cm
Each brand’s own published chart; sources and dates on how we size. Where bars overlap, both sizes fit.
Bike size chart by height
Our consensus of Specialized, Canyon, bike-discount.de and evo charts. Your starting size is marked; the shaded row also fits.
| Height | Height (cm) | Road and gravel | Mountain | Hybrid and city |
|---|---|---|---|---|
| 4′10″–5′1″ | 148–155 | XXS, 44–47 cm | XS, 13–14″ | XS |
| 5′1″–5′4″ | 155–163 | XS, 48–50 cm | XS or S, 14–15″ | S |
| 5′4″–5′7″ | 163–170 | S, 51–53 cm | S, 15–16″ | S or M |
| 5′7″–5′10″ | 170–178 | M, 54–55 cm | M, 17–18″ | M |
| 5′10″–6′1″ | 178–185 | L, 56–58 cm | L, 19–20″ | L |
| 6′1″–6′4″ | 185–193 | XL, 58–60 cm | XL, 21–22″ | XL |
| 6′4″ + | 193 + | XXL, 61 cm + | XXL, 23″ + | XXL |
How do I measure my inseam?
- Stand in socks with your back to a wall, feet about 15–20 cm (6–8 in) apart.
- Pull a hardback book up between your legs, spine up, as firmly as a saddle would sit.
- Mark the wall at the top of the book, step away, and measure from the mark to the floor.
- Measure twice. Most people are 1–2 cm out the first time. The full guide covers children too.
Bike size questions
What if I’m between two sizes?
We start you on the size your inseam supports, because the frame has to fit your legs. The bigger frame is longer and steadier at speed; the smaller one is nimbler and lower to step over. Ride both if you can.
Do I need my inseam?
Height gets you the size band. Inseam tells us whether your legs are long or short for your height, which settles a between-sizes answer and whether you’ll clear the top tube.
Why does Canyon call me a small when Specialized says 56?
Brands agree on heights to within about one size, but they name sizes differently. That’s why we show each brand’s own name for your size.
How we size: height bands from four brands’ and shops’ published charts; inseam × 0.665 for road frames and × 0.226 for mountain bikes. Every source and date is on how we size.
Related
Road bike size chart
Frame sizes in cm, saddle height and standover
Mountain bike size chart
XS to XXL by rider height
Bike size by brand
Specialized, Canyon and evo side by side