BMX Bike Size Chart – Ultimate Guide to BMX Bike Sizing

BMX bikes are simplistic bikes used for off-road sport bicycle or can be used for stunts. BMX bikes can be available in different models like dirt, flatland, park, race, and street bikes. These bikes normally come in one frame with flexible sizes and can be easily adjusted according to the rider’s need. To change the bike’s size or frame, you can alter the wheel size according to the rider’s frame, height, and age.

Most of the BMX bikes come in different wheel sizes from 12 inches to 24 inches, with 20 inches being the true size to these bikes, and it is also the most common and popular size among the people.  The Top Tube (TT) measurement is more important to consider than wheel size as it is the length of the horizontal distance from the top tube to the seat tube.

Mostly BMX bikes with a wheel size of 12 inches to 18 inches, and 24 inches cruisers will have relevant TT lengths to their size wheel. The true wheel size of 20 inches will have different TT sizes, making it easier for riders to alter the bikes according to their need.

BMX Rider Sizing Chart

Rider HeightsFrame SizeTT LengthStem LengthBar RiseBar widthCrank LengthGearing
4’4” & underMicro15” – 16.5”Mini: 25 mm -35 mm2”- 2.5”20″ – 22.5.”145 mm – 155 mm41 – 43 / 16
4’2” – 4’10”Mini16” – 17.5”Mini-Mini XL: 30 mm – 40 mm2”- 3.5”21” – 23.5”155 mm – 165 mm41 – 43 / 16
4’6” – 5’11”Junior17” – 18.5”Mini XL- Expert: 40 mm – 45 mm3”- 5”22” – 25”160 mm – 175 mm42 – 43 / 16
5’0” – 5’4”Expert18.5” – 19.5”Expert-Pro: 43 mm – 48 mm5”- 7”25.5” – 27”170 mm – 175 mm42 – 43 / 16
5’2” – 5’6”Expert XL19.25” – 20”Expert-Pro: 43 mm – 48 mm6”- 7”25.5” – 27”170 mm – 175 mm42 – 43 / 16
5’3” – 5’8”Pro20” – 20.5”Pro: 50 mm – 55 mm7”- 8”27” – 28”175 mm – 180 mm43 – 44 / 16
5’7” – 6’0”Pro XL20.75” – 21.25”Pro XL: 50 mm – 55 mm8” +28”180 mm – 190 mm44 / 16 & over
6’ and overPro XXL21.25” – 22”Pro XL: 52 mm – 60 mm8” +28”180 mm – 190 mm44 / 16 & over

BMX Bike Size Chart on Functionality

Height/ DisciplineFreestyleRace
Under 100 cm (under 3’3”)12 inches Wheel size balance or pedal (based on confidence)12 inches Balance Class size
99 cm – 122 cm (3’33” to 4’)12 inches to 16 inches Wheel sizeMicro Mini Class size
122 cm – 137 cm (4’ to 4’6”)16 inches to 18 inches Wheel sizeMini Class Size
137 cm – 147 cm (4’6” to 4’10”)18 inches to 20 inches Wheel size (small TT size)Junior Class size
142 cm – 177 cm (4’8” to 5’4”)19.5 inches to 20.4 inches Top Tube LengthExpert Class Size
162 cm – 178 cm (5’4” to 5’10”)20.25 inches to 21 inches Top Tube Length      Pro Class Size
172 cm – 180 cm (5’8” to 6’)20.5 inches to 21.5 inches Top Tube LengthPro XL Class Size
180 cm and over (6’ and over)21 inches to 22 inches Top Tube LengthPro XXL Class Size

BMX Bikes on The Functionality

Depending on what you will be doing, we can determine the size of the BMX bike:

  • Park: Park riding or skate park riding is where the passenger would like a bike, which is much more receptive. They can be brought out by shorter Top Tube size (TT), shorter CS size, and a steeper HT angle. Ensure you refer to the lower end of the chart while referring to BMX bikes used for park riding. Here, the terms CS stands for chainstay, and HT stands for Head Tube.
  • Trails/Dirt: Trails and dirt jumping occurs on purpose and is normally built on dirt and trails where riders do a skilful jump. These riders would go for a more sizable, more stable, and firmer bike to do the jumps flawlessly. Those tricks can be accomplished by a longer Top Tube, Chain Stay, and a slacker Head Tube angle. All these features make the bike much more balanced and convenient, and the riders can do larger jumps without hurting themselves.
  • Street: As the name typically suggests, street riders take advantage of the structures in urban civilization to perform their highly skilled tricks and turns. They typically go over the rails, stairs, and other structures, so they need a very sturdy, durable bike. The street riders generally swing one extreme of the chart or another, and depending on their personal preferences, would normally be present in the intervening portion of it. Street riders prefer to get Best BMX bikes for street riding which are built tougher to take the grindings frictions and even landings better.

The BMX Bike Sizes and Prices

Most of the BMX bike sizes and prices are related. And here you can see what price you can expect from the respective prices:

  • Under 550 dollars: A BMX bike under 550 dollars would be economical for the common masses as it will feature high tensile steel strength, single-walled rims, and unsealed and open bearings. These bikes are mostly for beginners who are starting to practice their different stunts and preferably would not take it too far. These bikes generally come under the size of the 20.5 inches, which is the bikes’ true size.
  • 550 dollars – 800 dollars: A BMX bike within the price range of 550 dollars and 800 dollars will feature main tubes made of Cro-Mo steel, usually sealed bearings, rims with double-walled structure, and other parts are mostly based on the pro models of the bike. This price range of bikes will mostly come with top tube sizes being 20.4 inches to 20.8 inches.
  • 800 dollars – 1000 dollars: A BMX bike within the price range of 800 dollars to 1000 dollars will feature a full-frame, bar, and fork made of Cro-Mo steel along with some after-market parts and premium quality components. This price range will mainly offer BMX bikes with top tubes ranging from 20.5 inches to 21 inches.
  • 1000 dollars and above: The BMX bikes above the price range of 1000 dollars will feature full Cro-Mo steel parts for better stability and lightweight and scattered with high-end pro model parts and accessories, most of which could be picked off a shelf part for part.

The Material of BMX Bike

Depending on the material of the BMX bike, the functionality depends.

  • Hi-Ten: high tensile steel or hi-ten is a steel which is tenacious than your average mild steel. It is cost-effective and easier to work with than other materials.
  • Cro-Mo: Chromoly, commonly known as Cro-Mo steel, is made from a blend of Chromium and Molybdenum. It is the most favoured steel, which makes the BMX bikes best for stunts. The Cro-Mo is steel more portable and robust than Hi-Ten Steel.
  • Heat Treating: High treated steel is used for high-end bikes. It is a special procedure for treating Cro-Mo steel. In high treating, the Cro-Mo steel is heated and cooled after welding. This process increases the firmness of Cro-Mo steel tubing.

BMX Bike Size Depending on Parts

  • Crank Arm Lengths: A crank arm length of 175 mm is a stock standard where your feet would be slightly spaced apart for balance. This crank arm provides an effortless and steadier ride for many trails and transition riders. Street riders would originally go for a 10 mm shorter, 165 mm crank. This crank arm makes your feet closer to each other as it is more responsive and can avoid hitting the rear foot while running four pegs.
  • Fork Offset: A fork offset of 30 mm or more can provide stability to the transition riders to pull back while performing the jumps or airing a quartet pipe. A street rider would prefer an offset of 28 mm or a steeper length of 20 mm for a quick receptive anterior point so that they could perform tricks like balancing on the front wheel.
  • Bar Width & Rise: Rise typically means the bar height from the stem clamp to the handlebar’s peak. The BMX rise sizing can range from 9″ and up by various increments. Bar width has extra inches on either side that might provide more control and a more balanced centre of gravity. Few might even prefer smaller bars to keep the knee area clear while performing bar spins. The BMX bar sizes come in the length of range 28.5 inches to 30 inches.


The BMX bikes are the bikes typically used for performing stunts. And to perform stunts, one must be comfortable with their bike and their framework and different sizes. Here, you will find out that the size chart specifies the basic average length, which will work with most people of different heights.

You can still opt for a size or length, which is much more suitable and comfortable for your own needs. This is solely so that you could know the size chart and what is better for what kind of tricks and why it is preferred for most people. You do not need to blindly follow the length and find which frame and sizes the best work for you.

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