Kids, BMX, MTB, road
Bike Wheel Size Chart
Use this bike wheel size chart when the bike is sold by wheel diameter instead of frame size. A bicycle wheel size chart is most important for kids bikes, BMX bikes, folding bikes, and mountain bike wheel choices such as 27.5 or 29 inches.
Data reviewed: 2026-05-18
Model geometry is a reference check; sizing comes from the available size chart rows.
Enter your measurements to see your recommended size, backup size, confidence, and why it fits.
Kids bike size calculator
Calculate kids bike wheel size from height, age, inseam, and confidence.
Kids bike size chart
Compare 12, 16, 20, and 24 inch kids bike wheel-size ranges.
Kids bike size chart by age
Use age as a first-pass wheel-size shortlist.
BMX bike size calculator
Compare 20 inch bike and youth BMX wheel-size guidance.
Folding bike size calculator
Check 16 and 20 inch folding bike fit by seatpost and reach.
Sizing notes
Read the chart, then check the bike.
Kids bike wheel size is not frame size
Kids bikes are usually sold by wheel diameter. A 16 or 20 inch bike describes the wheel, while lowest saddle height, inseam, and brake reach decide whether the child can control it.
A 20 inch bike has different meanings
A 20 inch bike can be a child's bike, a youth BMX, or an adult BMX wheel standard. Compare rider height, top tube length, and intended use before choosing.
Adult road bikes usually use 700c wheels
For most adult road, gravel, and hybrid bikes, 700c is the common wheel label. Frame size, stack, reach, and standover decide fit more than the wheel label.
Mountain bikes use wheel size for handling
Mountain bike wheel size affects rollover, acceleration, and standover. A 27.5 or 29 inch wheel choice still needs the frame size to match the rider.
Bicycle wheel size chart
Size
12 inch
Height
2'10"-3'4" / toddler
Inseam: Balance bike or first pedal bike
Size
16 inch
Height
3'4"-4'0" / young child
Inseam: Check lowest saddle height and brake reach
Size
20 inch
Height
4'0"-4'8" / child or BMX
Inseam: 20 inch bike can mean kids bike or BMX wheel
Size
24 inch
Height
4'6"-5'2" / youth
Inseam: Confirm inseam before moving to adult XS
Size
26 inch
Height
4'10"-5'6" / youth or adult
Inseam: Older MTB, cruiser, folding, or compact adult fit
Size
27.5 / 29 inch
Height
adult MTB
Inseam: Choose by frame geometry, terrain, and handling
Size
700c
Height
adult road, gravel, hybrid
Inseam: Wheel size is standard; frame size decides fit
FAQ
Short answers for choosing a size before purchase.
How do I use a bike wheel size chart?
Use the wheel label to understand the bike category, then check rider height, inseam, saddle height, and frame fit before buying.
What does a 20 inch bike mean?
A 20 inch bike usually refers to wheel diameter. It can describe a kids bike, youth BMX, or adult BMX wheel, so check rider height and top tube length.
Is kids bike wheel size based on age or height?
Use both as a first pass, but height, inseam, lowest saddle height, brake reach, and confidence decide the final kids bike wheel size.
Is 700c a bike size?
700c is a wheel-size label used on many adult road, gravel, and hybrid bikes. It does not replace frame sizing.