BikeSizeGuide

Bike Size Chart

Compare the road and mountain sizes each brand publishes for your height. Add your inseam for a Trek check.

By BikeSizeGuide Team

Find your size

Your height
Inseam optional

Road · by height

Trek—Domane SLR
Specialized—Tarmac
Giant—TCR Advanced Pro + Defy Advanced
Cannondale—SuperSix EVO

Mountain · by height

Trek—Marlin
Specialized—Stumpjumper
Giant—Trance X
Cannondale—Habit

Trek (the only brand here that publishes inseam)

Domane SLR: —

Marlin: —

Enter your height to see each brand’s published sizes.

Bike Size Chart by Height

Each brand uses its own size labels and height ranges. Your matches light up when you use the finder.

Road bike height ranges by brandEach brand has a band of horizontal bars, one per published size and model. All bars share a height axis. Exact ranges and source links are in the tables below. A gold vertical line marks the height entered in the finder.Rider height142 cm200 cm≈ 4′8″≈ 6′6.5″TrekDomane SLRXS (47cm)Trek Domane SLR XS (47cm): 143–158 cmS (50cm)Trek Domane SLR S (50cm): 158–162 cmM (52-54cm)Trek Domane SLR M (52-54cm): 162–173 cmML (56cm)Trek Domane SLR ML (56cm): 173–179 cmL (58cm)Trek Domane SLR L (58cm): 179–188 cmXL (60-62cm)Trek Domane SLR XL (60-62cm): 188–199 cmSpecializedTarmac44Specialized Tarmac 44: 142–155 cm49Specialized Tarmac 49: 155–163 cm52Specialized Tarmac 52: 163–170 cm54Specialized Tarmac 54: 170–175 cm56Specialized Tarmac 56: 175–180 cm58Specialized Tarmac 58: 180–188 cm61Specialized Tarmac 61: 188–196 cmGiantTCR Advanced ProXSGiant TCR Advanced Pro XS: 157–169 cmSGiant TCR Advanced Pro S: 165–175 cmMGiant TCR Advanced Pro M: 171–181 cmMLGiant TCR Advanced Pro ML: 177–187 cmLGiant TCR Advanced Pro L: 183–193 cmXLGiant TCR Advanced Pro XL: 189–199 cmDefy AdvancedXSGiant Defy Advanced XS: 160–168 cmSGiant Defy Advanced S: 166–174 cmMGiant Defy Advanced M: 172–180 cmMLGiant Defy Advanced ML: 178–186 cmLGiant Defy Advanced L: 184–192 cmXLGiant Defy Advanced XL: 190–198 cmCannondaleSuperSix EVO44Cannondale SuperSix EVO 44: 144–154 cm48Cannondale SuperSix EVO 48: 152–162 cm50Cannondale SuperSix EVO 50: 157–167 cm52Cannondale SuperSix EVO 52: 165–175 cm54Cannondale SuperSix EVO 54: 170–180 cm56Cannondale SuperSix EVO 56: 177–185 cm58Cannondale SuperSix EVO 58: 182–193 cm61Cannondale SuperSix EVO 61: 190–200 cm
Published road height ranges. Overlaps are kept as published; highlighted bars include your height. The gold line marks your entry. See the tables for exact ranges and sources.

Trek

Domane SLR

Trek Domane SLR: Road bike sizes by height
HeightPublished size
≈ 4′8.5″–5′2″143–158 cmXS (47cm)
≈ 5′2″–5′4″158–162 cmS (50cm)
≈ 5′4″–5′8″162–173 cmM (52-54cm)
≈ 5′8″–5′10.5″173–179 cmML (56cm)
≈ 5′10.5″–6′2″179–188 cmL (58cm)
≈ 6′2″–6′6.5″188–199 cmXL (60-62cm)

Source: Trek Domane SLR. Fetched .

Specialized

Tarmac

Specialized Tarmac: Road bike sizes by height
HeightPublished size
≈ 4′8″–5′1″142–155 cm44
≈ 5′1″–5′4″155–163 cm49
≈ 5′4″–5′7″163–170 cm52
≈ 5′7″–5′9″170–175 cm54
≈ 5′9″–5′11″175–180 cm56
≈ 5′11″–6′2″180–188 cm58
≈ 6′2″–6′5″188–196 cm61

Source: Specialized Tarmac. Fetched .

Giant

TCR Advanced Pro

Giant TCR Advanced Pro: Road bike sizes by height
HeightPublished size
≈ 5′2″–5′6.5″157–169 cmXS
≈ 5′5″–5′9″165–175 cmS
≈ 5′7.5″–5′11.5″171–181 cmM
≈ 5′9.5″–6′1.5″177–187 cmML
≈ 6′0″–6′4″183–193 cmL
≈ 6′2.5″–6′6.5″189–199 cmXL

Source: Giant TCR Advanced Pro. Fetched .

Defy Advanced

Giant Defy Advanced: Road bike sizes by height
HeightPublished size
≈ 5′3″–5′6″160–168 cmXS
≈ 5′5.5″–5′8.5″166–174 cmS
≈ 5′7.5″–5′11″172–180 cmM
≈ 5′10″–6′1″178–186 cmML
≈ 6′0.5″–6′3.5″184–192 cmL
≈ 6′3″–6′6″190–198 cmXL

Source: Giant Defy Advanced. Fetched .

Cannondale

SuperSix EVO

Cannondale SuperSix EVO: Road bike sizes by height
HeightPublished size
≈ 4′8.5″–5′0.5″144–154 cm44
≈ 5′0″–5′4″152–162 cm48
≈ 5′2″–5′5.5″157–167 cm50
≈ 5′5″–5′9″165–175 cm52
≈ 5′7″–5′11″170–180 cm54
≈ 5′9.5″–6′1″177–185 cm56
≈ 5′11.5″–6′4″182–193 cm58
≈ 6′3″–6′6.5″190–200 cm61

Source: Cannondale SuperSix EVO. Fetched .

Both endpoints are included. Shared boundaries and overlaps show every matching size. Imperial heights are approximate conversions of the published cm ranges; size labels stay as published.

Bike Size Chart by Bike Type

Each kind of bike is sized its own way. Use the chart for the bike you’re buying.

Road bikeSide view of a road bike with a level top tube, drop handlebars, and thin tires.
Road bike. The highlighted seat tube is a frame measurement. Use the model’s published size label.
Mountain bikeSide view of a mountain bike with a sloping top tube, flat handlebar, suspension fork, and wide knobby tires.
Mountain bike. These charts keep the brand’s published size labels. The top tube slopes down for clearance.

Mountain bikes

Published labels are specific to each model. Compare reach and standover as well as height.

Mountain bike height ranges by brandEach brand has a band of horizontal bars, one per published size and model. All bars share a height axis. Exact ranges and source links are in the tables below. A gold vertical line marks the height entered in the finder.Rider height145 cm203 cm≈ 4′9″≈ 6′8″TrekMarlinXSTrek Marlin XS: 145–155 cmSTrek Marlin S: 155–165 cmMTrek Marlin M: 165–177 cmMLTrek Marlin ML: 173–180 cmLTrek Marlin L: 177–188 cmXLTrek Marlin XL: 188–195 cm2XLTrek Marlin 2XL: 195–203 cmSpecializedStumpjumperS1Specialized Stumpjumper S1: 150–160 cmS2Specialized Stumpjumper S2: 157–173 cmS3Specialized Stumpjumper S3: 165–180 cmS4Specialized Stumpjumper S4: 173–188 cmS5Specialized Stumpjumper S5: 178–193 cmS6Specialized Stumpjumper S6: 188–203 cmGiantTrance XSGiant Trance X S: 163–172 cmMGiant Trance X M: 171–180 cmLGiant Trance X L: 179–188 cmXLGiant Trance X XL: 187–196 cmCannondaleHabitXSCannondale Habit XS: 152–157 cmSMCannondale Habit SM: 154–165 cmMDCannondale Habit MD: 162–175 cmLGCannondale Habit LG: 172–182 cmXLCannondale Habit XL: 180–195 cm
Published mountain height ranges. Overlaps are kept as published; highlighted bars include your height. The gold line marks your entry. See the tables for exact ranges and sources.

Trek

Marlin

Trek Marlin: Mountain bike sizes by height
HeightPublished size
≈ 4′9″–5′1″145–155 cmXS
≈ 5′1″–5′5″155–165 cmS
≈ 5′5″–5′9.5″165–177 cmM
≈ 5′8″–5′11″173–180 cmML
≈ 5′9.5″–6′2″177–188 cmL
≈ 6′2″–6′5″188–195 cmXL
≈ 6′5″–6′8″195–203 cm2XL

Source: Trek Marlin. Fetched .

Specialized

Stumpjumper

Specialized Stumpjumper: Mountain bike sizes by height
HeightPublished size
≈ 4′11″–5′3″150–160 cmS1
≈ 5′2″–5′8″157–173 cmS2
≈ 5′5″–5′11″165–180 cmS3
≈ 5′8″–6′2″173–188 cmS4
≈ 5′10″–6′4″178–193 cmS5
≈ 6′2″–6′8″188–203 cmS6

Source: Specialized Stumpjumper. Fetched .

Giant

Trance X

Giant Trance X: Mountain bike sizes by height
HeightPublished size
≈ 5′4″–5′7.5″163–172 cmS
≈ 5′7.5″–5′11″171–180 cmM
≈ 5′10.5″–6′2″179–188 cmL
≈ 6′1.5″–6′5″187–196 cmXL

Source: Giant Trance X. Fetched .

Cannondale

Habit

Cannondale Habit: Mountain bike sizes by height
HeightPublished size
≈ 5′0″–5′2″152–157 cmXS
≈ 5′0.5″–5′5″154–165 cmSM
≈ 5′4″–5′9″162–175 cmMD
≈ 5′7.5″–5′11.5″172–182 cmLG
≈ 5′11″–6′5″180–195 cmXL

Source: Cannondale Habit. Fetched .

Overlaps are kept as published. Imperial ranges are approximate; matching uses the original cm endpoints.

Road bike sizes and Trek inseam chart

How to Measure Your Inseam

Your cycling inseam is longer than the inseam on your jeans. It takes two minutes and a hardback book.

Measuring cycling inseam with a bookA barefoot person stands against a wall holding a hardback book level between their legs, pressed up as a saddle would sit. A measuring line runs from the floor to the top edge of the book.Inseamfloor → bookLevel book
Measure from the floor to the top edge of the book.
  1. Stand barefoot against a wall with your feet comfortably apart.
  2. Pull a hardback book up between your legs. Spine up, pressed firmly like a saddle, and kept level.
  3. Measure from the floor to the top of the spine. Mark the wall if nobody can hold the tape. Repeat to check that your reading is consistent.

Bike Size Guide

What the numbers on a size chart actually measure, and what to do when you fall between two.

Where bike frame size is measuredSide view of a road bike. The seat tube, from the center of the crank to the top of the seat tube, is highlighted as the frame size. The top tube and the standover height, from the ground to the top tube, are also marked.Frame sizeseat tubeTop tubeStandover
Road frames are sized by seat tube length in cm; mountain frames often in inches or letters.

Between sizes?

Compare reach, stack, and standover clearance on the two frames. Height alone cannot tell you which riding position will feel better. Try both sizes if you can.

Centimeters ↔ letter sizes

Use the brand’s published label rather than translating between centimeters and letters. A medium in one brand may fit differently from a medium in another. Letter sizes are not a universal standard.

Standover

You should be able to stand over the top tube with both feet flat. Your inseam is the number to compare with a bike’s listed standover height.

Does Your Bike Fit?

A size chart gets you close. These are the signs to check on a test ride or on a bike you already own.

Bike that is too smallA rider on a frame that is too small: lots of exposed seatpost, an upright hunched back, sharply bent elbows, and knees coming up close to the handlebars.
Too small
  • Knees come close to the bars
  • Lots of seatpost showing
  • Cramped, hunched back
Bike that is good fitA rider on a frame that fits: a slight bend in the knee at the bottom of the pedal stroke, a relaxed bend in the elbows, and a comfortable forward lean.
Good fit
  • Slight knee bend at the bottom
  • Elbows relaxed, not locked
  • Easy reach to the brakes
Bike that is too bigA rider on a frame that is too big: the saddle cannot go low enough so the leg is fully straight and the foot struggles to reach the pedal, and the arms are locked straight to reach the bars.
Too big
  • Legs overreach the pedals
  • Arms locked straight
  • Little or no standover clearance
Checking standover clearanceA rider stands over a road bike with both feet flat on the ground. There is a small gap between the top tube and the rider's crotch, marked as the clearance.Clearancefeet flat
Stand over the top tube with both feet flat. You want a gap, not contact.

Standover first

Before you ride, straddle the bike with both feet flat. If the top tube presses into you, the frame is too big, whatever the chart says.

Then saddle height

Set the saddle so your knee is slightly bent at the bottom of the pedal stroke. If the seatpost can’t go low enough, or needs to stick out past its limit line, try another size.

Then reach

On the bars, your elbows should stay soft and you should reach the brakes without stretching. A stem change can fix a little; it can’t fix a frame that’s a full size off.

Frequently Asked Questions

Is height enough to choose a bike size?

Height gives you a starting range. Check your inseam, standover clearance, and the brand’s geometry chart, then try the bike if possible. Riders of the same height can have different leg and torso lengths.

Are bike frame sizes the same across brands?

No. A letter size or frame measurement can describe a different fit across brands and bike types. Compare the specific model’s geometry and official sizing chart.

Should I size up or down if I am between sizes?

Compare both frames rather than choosing by the size label alone. Check reach, stack, and standover clearance. A test ride or bike fit can help you decide which frame suits your proportions and riding position.