Bicycle Frame Size Chart: Road, Mountain & Hybrid Sizes

The frame size chart

The table below gives road, mountain, and hybrid sizes by rider height. The ranges are compiled from published manufacturer and retailer sizing charts — the standard range convention used across major bike makers' charts — and the standover rules follow REI's bike-fit guidance. One warning before you use it: published charts disagree by about 2 cm at the tall end (one widely used single-value chart gives 58 cm for a 6 ft 0 in–6 ft 3 in rider where this table gives 60–62 cm), because brands measure seat tubes differently and build different geometry. Treat the table as a starting range, not a verdict — and let your inseam, not your height, break the ties.

Frame sizes by rider height — printable reference

The inseam rule: road frame ≈ inseam × 0.67

Height alone is a blunt tool, because two riders of the same height can have very different leg lengths. The classic rule — used by fitters for decades — is that your road frame in centimetres is about your inseam in centimetres times 0.67. A 32 in inseam is 32 × 2.54, or 81.28 cm, and 81.28 × 0.67 is 54.5 cm, which lands in the 54–56 cm range — midpoint 55 cm — and agrees with the 5'6"–5'9" height row. The rule is a road-frame rule: it gives the traditional seat-tube size, and modern compact frames with sloping top tubes often read 1–2 cm smaller, so treat it as the starting point and confirm with standover. When the height row and the inseam rule disagree, the inseam wins and you size down: a shorter frame is easier to live with than one that is too tall, because you can raise the saddle and lengthen the stem, but you cannot shrink a frame that is too big.

When height and inseam disagree

5 ft 3 in, 29 in inseam: the height row says 51–53 cm, but the inseam gives 29 × 2.54 = 73.66 cm, and 73.66 × 0.67 = 49.4 cm — which lands in the 48–50 cm range. The rider is between sizes, so the answer is road 48–50 cm, mountain XS/S, hybrid 13–15 in: size down.

6 ft 1 in, 34 in inseam: the height row says 60–62 cm, but the inseam gives 34 × 2.54 = 86.36 cm, and 86.36 × 0.67 = 57.9 cm — which lands in the 57–59 cm range. The answer is road 57–59 cm, mountain M/L, hybrid 19–21 in: size down, and try the M first on a mountain bike.

5 ft 0 in, 27 in inseam: the height row says 48–50 cm, but the inseam gives 27 × 2.54 = 68.58 cm, and 68.58 × 0.67 = 46.0 cm — below the table's smallest row. The answer is to try the smallest frames, 44–48 cm, and confirm standover: mountain XS/S, hybrid 13–15 in.

6 ft 4 in, 36 in inseam: the height row says 63+ cm, but the inseam gives 36 × 2.54 = 91.44 cm, and 91.44 × 0.67 = 61.3 cm — which lands in the 60–62 cm range. The answer is road 60–62 cm, mountain L, hybrid 21–23 in: size down.

Standover: the check that catches a bad size

Standover is the clearance between your body and the bike's top tube when you stand over it with your feet flat on the floor — and it is the check that catches a frame your height row got wrong. For a road bike you want at least 1–2 in of clearance (about 1 in on a traditional straight top tube, 2 in or more on a modern sloping one, per REI's fit guidance); for a mountain bike you want 2–4 in, because you will be hopping on and off on rough ground. Your inseam sets the ceiling: with a 32 in inseam, look for a road frame with a standover height of 31 in or less, and a mountain frame with a standover of 30 in or less. If the frame you want has a standover taller than your inseam minus the clearance, it is too big no matter what the size chart says — size down. Measure your inseam in cycling shoes, because they add to your leg length, and compare against the standover height listed on the bike's geometry page, not the frame size alone.

Output · formula · meaning

Who uses this

• The first-time buyer: is 5 ft 9 in with a 32 in inseam and learns the road frame is 54–56 cm (midpoint 55 cm), the mountain bike is a medium, and the hybrid is 17–19 in — and that the height row alone would have pointed to 57–59 cm, so the inseam check saved a size mistake.
• The long-legged rider: is 6 ft 1 in with a 34 in inseam and learns the height row says 60–62 cm but the inseam gives 57.9 cm — road 57–59 cm, mountain M/L, hybrid 19–21 in — and to try the M first on a mountain bike.
• The short rider: is 5 ft 0 in with a 27 in inseam and learns the inseam gives 46.0 cm, below the table's smallest row — so the smallest standard frames, 44–48 cm, are the place to start, with an XS/S mountain bike and a 13–15 in hybrid.
• The online shopper: cannot test-ride the bike and learns to check the standover height on the geometry page against their inseam — 31 in or less for a road bike with a 32 in inseam — before ordering.

Accuracy & limitations

Frame sizes are a starting range, not a measurement of your body. Published charts disagree by about 2 cm at the tall end because brands measure seat tubes differently and build different geometry — a size 54 from one brand can feel like a 56 from another, and REI's own guidance is to compare the listed standover height against your inseam rather than trusting the size label. The 0.67 rule gives the traditional seat-tube size; modern compact road frames with sloping top tubes often read 1–2 cm smaller, so a 54.5 cm result can mean a 52–54 cm compact frame. Reach, stack, and effective top-tube length also matter — two frames of the same seat-tube size can put the handlebars in very different places — and none of them are in this chart. Women-specific and youth frames follow the same height and inseam logic but often use different geometry, so check the brand's own chart for those. Measure your inseam twice (the book method, in cycling shoes) before ordering, and if you are between sizes, size down: a frame that is a little small can be adjusted, a frame that is too big cannot.