Bike Size Chart by Height: Feet, Inches, and Centimeters

01

One height, four labels

A chart by height maps your height to the size label a manufacturer prints on the frame. You bring one number and the chart answers with one label. The answer changes with the bike type, because road, mountain, gravel, and hybrid frames count their size along a different tube and in a different unit.

Read the band your height falls in, then read the column for the bike you want. A rider at 165 to 177 cm reads 52–54 cm on a road frame, M on a mountain frame, S–M on a gravel frame, and M on a hybrid frame. The four labels describe one rider.

The bands overlap, so one size can sit in two bands. Every adult ladder answers a height from 155 cm to 197 cm, and a rider inside that range gets an answer from all four. Outside it, one ladder stops before another starts.

Read your height band, then the column for the bike you are buying.

02

What height is a 54 cm frame?

A road frame is sold in centimeters, and the number measures the seat tube from the center of the bottom bracket to the seat collar, not your leg. A 54 cm frame covers 5'7"–5'10" (169–178 cm) of rider height and 77–82 cm of inseam. Read the label as the heights it covers, not as a length you measure on your body.

The letters beside each centimeter are a brand convention, not a standard. In this ladder 48 cm carries XS and 61 cm carries XL, and the letters do not line up across brands. Trust the centimeter label on the frame and the geometry table on the product page.

An advert that reads 54 cm tells you the height range for that frame, so answer it with your height. Confirm the inseam before you travel to see the bike. That height range holds whatever your leg length, so standover is what separates two riders at the same height.

Answer a centimeter label with your height, then confirm the inseam.

03

What height is a 17–18 inch frame?

A mountain frame is sold in inches, and most brands print a letter beside the number. A 17–18-inch frame covers 5'6"–5'10" (167–178 cm) of rider height and 76–82 cm of inseam. The inch figure names the seat tube, and the rider who reads 54 cm on a road frame reads M on this ladder.

A mountain bike carries two labels at once: a letter on the size chart and the traditional inch figure beside it. In this ladder XS carries 13–14" and XXL carries 23"+. Both labels describe one frame, so read whichever one the listing prints.

The mountain ladder starts lower and ends higher than the road ladder. It begins at 150 cm and stops at 204 cm. A tall rider who runs out of road sizes still has a mountain size to try, and a short rider gets a first answer before 155 cm, where the road sizes begin.

Read the inch figure and the letter as one frame size, not two.

04

Hybrid and gravel frames write letters

A hybrid frame is sold in letters, with the traditional inch figure beside the letter. The hybrid ladder covers 148–198 cm of rider height, the lowest of the four. An upright bar and a low standover keep the extra-small size open to a rider below 155 cm, where the road sizes begin.

A gravel frame is sold in letters alone. The gravel ladder covers 155–197 cm of rider height across 5 sizes, and each letter covers the heights a road centimeter label covers, without printing the centimeter. Some brands print a numeric equivalent beside the letter, and those numbers differ by brand, so compare the heights that letter covers with the reach on the product page.

Do not copy your road size onto a gravel frame. The gravel ladder prints letters and no centimeters, while the road ladder prints 7 centimeter labels, so no centimeter label translates into a gravel letter. Read the heights the gravel letter covers, then confirm the reach on the frame you are buying.

Read the heights the gravel letter covers, not your road size.

05

Kids bikes: height picks the wheel

A kids bike is sold by wheel diameter, not by frame size. The kids ladder runs from 12" at 90 cm to 26" at 160 cm across 7 wheels, and each step raises the lowest height by 5 cm to 15 cm. Read the height range first and the diameter second.

The top of the kids ladder meets the bottom of the adult ladders. The 26" wheel covers 145–160 cm of rider height, the smallest hybrid frame starts at 148 cm, and the smallest mountain frame starts at 150 cm. A child inside that overlap can ride either bike.

Take the smaller wheel when the child sits at the bottom of a height range and the larger wheel when the child sits at the top. The 26" wheel overlaps the smallest hybrid frame by 12 cm, so the last step of the kids ladder and the first step of an adult ladder both fit a child at the top.

Measure the child's height before you read the wheel size.

06

Measure your height the way a fitter does

The chart reads in centimeters, so measure in centimeters. Height taken in shoes reads higher than height taken barefoot, and a band runs 8 cm to 17 cm wide, so a shoe sole can move you onto the next frame size. Measure barefoot, on a hard floor, with your back against a wall.

Record the number in centimeters and in feet and inches. The ladders above read in centimeters, and a listing prints one unit or the other. The road ladder starts at 48 cm and the mountain ladder starts at 150 cm of rider height, so both charts assume one height, written two ways.

Measure barefoot, then use that number on every chart.

07

Why the four ladders disagree

The four labels describe four frames, not four bodies. A road frame counts the seat tube in centimeters, a mountain frame counts a shorter seat tube in inches, a hybrid frame counts the same tube and prints the letter that shops use, and a gravel frame prints the letter alone. The numbers cannot match, because the tubes they measure do not match.

The ladders also start and stop at different heights. Every ladder answers a height from 155 cm to 197 cm. Outside that range the hybrid ladder starts at 148 cm and the mountain ladder ends at 204 cm. A rider below 155 cm gets an answer from the hybrid and mountain ladders before the road and gravel ladders answer at all.

Two frames with the same label still fit differently. Reach and stack describe where the bars sit, and the 6 hybrid frames at one size list reach from 374.2 mm to 410 mm, 36 mm apart. Compare the geometry table before you copy a size across brands or across bike types.

Compare reach and stack before you copy a size between bike types.

08

Inseam decides between two sizes

The inseam column checks the height answer. The road labels cover 69–95 cm of inside leg, and a rider whose inseam sits at the bottom of a height range takes the smaller of two adjacent frames. Measure the inseam the way you measured the height: barefoot, with the book pulled up tight between the legs.

Standover turns the inseam into a clearance check. The house rule leaves 20 to 30 mm of clearance on road and hybrid frames, 30 to 50 mm on gravel frames, and 50 to 100 mm on mountain frames. Read the standover figure from the product page and compare it with the inseam you measured.

A frame that clears at the top tube can still be too tall at the saddle. Check the lowest saddle height the seatpost and the frame allow, because a rider at the bottom of a height range can be left with the saddle below its safe mark.

Compare standover with your inseam before you pay.

09

Between two sizes

Adjacent sizes overlap, so a rider can sit in both. The road ladder puts 52 cm at 5'5"–5'7" (164–171 cm) and 54 cm at 5'7"–5'10" (169–178 cm), so both sizes cover 169–171 cm. Inside that range, height alone cannot choose.

The two sizes differ in clearance and reach, so choose by the riding you plan to do. The smaller size leaves more standover clearance and a shorter reach, which suits technical ground and a rider who is still building confidence. The larger size puts the bars further forward and sits the rider more upright, which suits long paved rides. Change the stem and the saddle position only after you choose the frame.

Let the inseam break the tie when the two sizes sit close. A rider with a short inseam for their height takes the smaller frame, and a rider with a long inseam takes the larger one. Then confirm the standover figure and the reach figure on the exact model year.

Take the smaller size when your inseam is short for your height.

10

Check the size before you pay

A chart by height narrows the search to one or two sizes. Finish the job with the numbers printed on the exact frame: standover, reach, and stack. Those three decide whether the bike you found is the bike you can ride.

Confirm the exact model year before you pay.

Questions

Height chart FAQ