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Charts

Bike Charts for Quick Reference

42 charts with the numbers riders look up most: bike sizes, tire pressures, gear ratios, training zones, e-bike range and standard measurements. Each one explains where the data comes from and links to the calculator for your exact case.

Updated October 19, 2026

Size and fit

Size charts by height and inseam, saddle height, crank length and kids' bikes.

Bike Size Chart by Height and Type of Bike

The frame size that fits your height on six types of bike, from 4 ft 11 in to 6 ft 7 in. Find your height in the first chart and read across to your type of bike; below it, each type has its own chart with frame sizes.

Road Bike Size Chart by Height and Inseam

Your road bike size as a letter and in centimeters of frame for your height, the classic size from your inseam, and the rule for deciding when you fall between two. Start with height, then fine-tune with inseam.

Mountain Bike Size Chart by Height, Frame Inches and Inseam

Your MTB size as a letter and in inches for your height, the classic inseam math, and the crank and saddle height that go with it. Find your height and, if you land on a cutoff, let your inseam decide.

Saddle Height Chart by Inseam and Crank Length

Saddle height for every half inch of inseam from 27 to 37 inches, with the four most common crank lengths, in inches and centimeters. Find your inseam, go to your crank length column and start with that value.

Crank Length Chart by Inseam

The crank length that matches your inseam, from the classic chart and from today's trend toward shorter cranks, for road, gravel, hybrid, mountain and triathlon bikes. Find your inseam and read the column for your bike.

Handlebar and Stem Sizes: Clamp, Steerer and Width

The handlebar clamp and steerer tube diameters you need to match when you swap a stem, plus a guide to road handlebar width based on how wide your shoulders are.

Bike Helmet Size Chart by Head Circumference

Which helmet size fits you at Giro, Bell, MET and Lazer, based on your head circumference in inches and centimeters. Measure with a soft tape and find your number in the second chart.

Cycling Shoe Size Chart: EU, US, UK and Foot Length

The US and UK equivalent of each European cycling shoe size for Shimano, Sidi and Fizik, and the foot length each brand assigns to it. Measure your foot and find the row for your brand.

Size charts by brand

Each brand's official size guide, in one consistent format.

Road Bike Size Chart by Brand and Height

Your road bike size in eight brands at once, from 5 ft to 6 ft 7 in. Find your height in the first column and read across for each brand; each brand name links to its full chart, with gravel and mountain bikes.

Canyon Size Chart by Rider Height

The size Canyon recommends for each height on its best-selling bikes, from 2XS to 2XL. Find your type of bike, locate your height in the column for your model and read the size on that row.

Specialized Bike Size Chart by Rider Height

The sizes Specialized recommends for each height on its main models, from its official size guide. Road and gravel bikes are sized by number; mountain bikes by letter or on the S1-S6 scale.

Trek Bike Size Chart by Height and Inseam

The sizes Trek recommends for each rider height and inseam on its best-selling bikes. Find the chart for your type of bike and check that both of your measurements land on the same row.

Orbea Bike Size Chart by Rider Height

The size Orbea recommends for each height on its best-selling bikes: numbered (47 to 60) on road bikes and lettered on gravel and mountain bikes. Find the chart for your type of bike, locate your height and read the size on that row.

Giant Bike Size Chart by Rider Height

The height ranges Giant gives for each size on its best-selling bikes. The ranges overlap on purpose: if your height falls into two sizes, the last section helps you choose.

Scott Bike Size Chart by Rider Height

The size Scott recommends for each height on its best-selling road, gravel and mountain bikes, from XXS to XXL. Find the chart for your type of bike, locate your height and read the size on that row.

Decathlon Bike Size Chart: Van Rysel, Triban and Rockrider

The size Decathlon recommends for each height on its road, gravel and mountain bikes. Find the chart for your type of bike, locate your height and read the size on that row: the same letter doesn't mean the same thing on every bike.

Bianchi Bike Size Chart by Height and Inseam

The size Bianchi's official guide assigns to each height, with the matching inseam. Road bikes are sized by number from 47 to 61; gravel bikes by letter from XS to XL.

Wheels and tire pressure

Tire pressures, tire sizes, wheel circumferences and valves.

Road Bike Tire Pressure Chart by Weight and Tire Width

Front and rear pressure in psi (bar in parentheses) for 25, 28, 30, 32 and 35 mm tires, for riders from 110 to 240 lb, tubeless and with inner tubes. Find your weight, go to your tire width and read front / rear.

Gravel Tire Pressure Chart by Weight and Tire Width

Front and rear pressure in psi (bar in parentheses) for 35 to 50 mm gravel tires, for riders from 110 to 240 lb, tubeless and with inner tubes. Find your weight, go to your tire width and read front / rear.

Mountain Bike Tire Pressure Chart by Weight and Tire Width

Front and rear pressure in psi (bar in parentheses) for 2.2 to 2.6 inch mountain bike tires, for riders from 110 to 240 lb, tubeless and with inner tubes. Find your weight, go to your tire and read front / rear.

Hybrid and City Bike Tire Pressure Chart by Weight and Width

Front and rear pressure in psi (bar in parentheses) for 35 to 55 mm hybrid, city and touring tires, for riders from 110 to 240 lb, with inner tubes and tubeless. Find your weight, go to your tire width and read front / rear.

Bike Tire Size Chart: ETRTO, French and Inch Sizes

Every tire size in ETRTO millimeters, with its other names in the French system and in fractional inches. Find what's printed on your tire in the first column and read the ETRTO size, the only one you can't misread.

Bike Wheel Circumference Chart for Your Bike Computer

The millimeters to enter in your bike computer or speed sensor for each tire size, calculated with our formula and compared with CatEye's official chart. Find your size and copy the value.

Bike Valve Chart: Sizes and Length by Rim Depth

The measurements of the three bike valve types and the valve length you need for your rim depth. Check your valve type first, then find your rim depth in the second chart.

Drivetrain

Speed by cadence, gear ratios and chain and cassette compatibility.

Bike Gear Ratio Chart in Gear Inches and Meters

Gear inches and meters traveled per pedal stroke for every chainring and cog combination in eight common road, gravel and mountain bike drivetrains. Find your drivetrain in the summary, then scroll to its chart to see every gear.

Bike Speed Chart by Cadence and Gear

How fast you go in every chainring and cog combination at 60 to 110 pedal revolutions per minute. Find the chart for your chainring, the row for your cog and the column for your cadence.

Bike Chain Length Chart by Chainstay, Chainring and Cog

The number of chain links for the most common big chainring and big cog combinations, by chainstay length. Find your combination in the rows and your chainstay in the columns.

Bike Chain Width and Compatibility Chart by Number of Speeds

How wide a 6- to 12-speed chain is, which brands can be mixed and what each one closes with. Find the number of speeds on your cassette: your chain has to match it.

Training and power

Power and heart rate zones, W/kg by level, watts and calories.

Cycling Power Zones Chart by FTP

The watts for each training zone at an FTP of 150 to 350 W, using Andrew Coggan's seven zones. Find your FTP in the first column and read the ranges across your row.

Heart Rate Zones by Age: Max HR and Training Zones Chart

Your estimated maximum heart rate and the heart rate for each zone at ages 20 to 70. Find your age in the first column and read your row from left to right.

Watts per kg Chart: FTP Levels and Watts by Body Weight

Which level your FTP is in watts per kilogram, and how many watts you need for each level at your weight. Find your weight in the first column and read the watts for each level.

Watts Needed by Speed on Flat Roads

The watts you need to hold 12 to 28 mph on flat ground with no wind, by bike and riding position. Find your speed in the first column and your bike across the top.

Climb Times on Famous Climbs by Your Watts per kg

How long a 159 lb (72 kg) rider on a 21 lb (9.5 kg) bike takes to ride up fifteen legendary European climbs at six levels of watts per kilogram. Find the climb in the first column and your level across the top.

Calories Burned Cycling by Speed and Weight

The calories you burn in an hour on the bike based on your average speed and body weight, plus the kilojoule to calorie conversion for riders who train with a power meter. Find your speed and cross it with your weight.

E-bikes

Range by battery and assist mode, energy use and cost per mile.

E-Bike Range Chart by Battery Size

How many miles an e-bike gets from a 400 to 800 Wh battery depending on assist mode and terrain, with kilometers alongside. Find your battery in the first column and read across to the terrain and mode you usually ride in.

E-Bike Cost per Mile Chart: E-Bike vs Car

What you pay in electricity for every 100 miles on an e-bike, and what it costs per year compared with driving. Find your energy use or your yearly miles in the first column.

Standards and measurements

Axles, bottom brackets, freehubs, rotors, helmets and torque specs.

Bike Axle Sizes: Quick Release, Thru-Axle and Boost

The hub widths and axle diameters used on today's road, gravel and mountain bikes. The first number is the axle diameter in millimeters and the second is the hub width between locknuts (O.L.D.).

Bottom Bracket Standards: Shell Width, Diameter and Thread

Shell dimensions for the threaded and press-fit bottom bracket standards on today's bikes. Measure your shell's width and inside diameter and find the matching row: the standard's name alone isn't enough.

Freehub Body Standards: Which Cassette Fits Each One

The eight freehub bodies found on today's road, gravel and mountain bike wheels, with the speeds they accept and the smallest cog possible. Find your cassette's brand and speeds and read which freehub your wheel needs.

Disc Brake Rotor Sizes: Diameters, Mounts and Adapters

The rotor diameters Shimano and SRAM make, how to recognize each caliper mount and which adapter you need to go up a size. At the end, the minimum thickness at which a rotor has to be replaced.

Seatpost Diameter Chart: Sizes and How to Find Yours

The seatpost diameters made today, which ones dropper posts come in and what size your frame's seat clamp is. The post has to match the inside diameter of the seat tube to a tenth of a millimeter.

Bike Torque Specs Chart: N·m and in-lb by Part

The torque values manufacturers publish for the parts you're most likely to work on at home, in newton meters and inch-pounds. They're a reference: the value that counts is the one printed on the part or in its manual.

How to use these charts

A chart gives you the typical value; your own case can be off by a few millimeters or a few pounds. When there's a calculator that fine-tunes the answer with your numbers, we link it at the top of each chart. You can print any chart (and printables has ready-to-print sheets for the workshop). The charts are published under aCC BY 4.0 license: you can reuse them as long as you credit BikeRatio with a link. If a number looks wrong, let us know.