WEIZE Bike Size Chart
Size chart and fit guide for 2026
WEIZE is an Amazon-direct kids and budget mountain bike specialist. Their lineup is wheel-size-driven (14", 16", 20" for kids; 24" for older kids; 26"/27.5" for adults) with most models offering adjustable seats and handlebars to extend the fit window. Sizing is by rider height and age, not frame stack/reach. Most kids' bikes ship with training wheels; the BMX and mountain models are more capable single-purpose builds.
WEIZE Size Charts by Category
WEIZE Kids Bike Size Chart
| Size | Height Range | Inseam Range |
|---|---|---|
| 14" Wheel (ages 3-5) | 2'11" - 3'11"(89 - 119 cm) | 15.0" - 20.9"(38 - 53 cm) |
| 16" Wheel (ages 4-7) | 3'5" - 4'5"(104 - 135 cm) | 17.7" - 23.6"(45 - 60 cm) |
| 20" Wheel (ages 6-12) | 3'10" - 5'2"(117 - 157 cm) | 20.9" - 28.0"(53 - 71 cm) |
| 24" Wheel (ages 8-14) | 4'6" - 5'6"(137 - 168 cm) | 25.2" - 31.5"(64 - 80 cm) |
14" Wheel (ages 3-5)
Height: 2'11" – 3'11" (89–119 cm)
Inseam: 15.0" – 20.9" (38–53 cm)
16" Wheel (ages 4-7)
Height: 3'5" – 4'5" (104–135 cm)
Inseam: 17.7" – 23.6" (45–60 cm)
20" Wheel (ages 6-12)
Height: 3'10" – 5'2" (117–157 cm)
Inseam: 20.9" – 28.0" (53–71 cm)
24" Wheel (ages 8-14)
Height: 4'6" – 5'6" (137–168 cm)
Inseam: 25.2" – 31.5" (64–80 cm)
WEIZE Mountain Bike Size Chart
| Size | Height Range | Inseam Range |
|---|---|---|
| 26" Wheel | 5'2" - 5'10"(157 - 178 cm) | 28.7" - 33.9"(73 - 86 cm) |
| 27.5" Wheel | 5'8" - 6'2"(173 - 188 cm) | 31.5" - 35.8"(80 - 91 cm) |
26" Wheel
Height: 5'2" – 5'10" (157–178 cm)
Inseam: 28.7" – 33.9" (73–86 cm)
27.5" Wheel
Height: 5'8" – 6'2" (173–188 cm)
Inseam: 31.5" – 35.8" (80–91 cm)
Popular WEIZE Models & Sizing Notes
Specific sizing recommendations for WEIZE's most popular bike models. Geometry measurements shown for reference size (typically M or 54cm).
Kids Bike Coaster
🧒 Kids Bike • 2026Entry-level WEIZE kids bike available in 14", 16", and 20" wheel sizes covering ages 3-12 (rider height 32"-60"). Coaster brake (backpedal) for tiny hands plus a hand brake on larger sizes, full chain guard, and detachable training wheels on the 14"/16". The 20" trim adds dual-suspension styling.
Stack: 410mmReach: 285mm
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Girls Doll-Seat Bike
🧒 Kids Bike • 2026Themed girls' bike with handlebar streamers, front basket, and an attached doll seat. Available in 14", 16", and 20" wheel sizes for ages 3-12. High-carbon steel frame, training wheels, coaster brake, and a bell - designed to make first rides feel like play.
Stack: 410mmReach: 280mm
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BMX-Style Kids Bike
🧒 Kids Bike • 2026BMX-styled kids bike with front and rear fenders, dual hand+foot brake, and detachable training wheels. Available in 16" (ages 4-6, 43"-49" tall) and 20" (ages 6-12, 46"-56" tall). High-carbon steel frame, multiple colors.
Stack: 460mmReach: 310mm
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Adjustable Coaster Bike
🧒 Kids Bike • 2026Updated WEIZE kids bike with adjustable seat AND handlebar height - useful for fast-growing kids ages 4-12. Available in 16" (rider 41"-53") and 20" (rider 48"-62"). Includes a basket and bell. Coaster brake plus front hand brake.
Stack: 460mmReach: 310mm
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Retro Girls Bike
🧒 Kids Bike • 2026Vintage-style girls bike with metal frame, faux-leather brown saddle, front basket and kickstand. 20" fits ages 6-12 (46"-59" tall, inseam 21"-26"). 24" extends fit through age 14. Aluminum V-brakes front and rear - no coaster, so kids should already be confident with hand brakes.
Stack: 510mmReach: 360mm
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Kids Mountain 6-Speed
🧒 Kids Bike • 2026Real kids' mountain bike with 6-speed drivetrain, front suspension fork, and front+rear caliper brakes. 20" fits ages 6-11 (42"-56" tall) with 63-71 cm saddle height. 24" fits ages 8-14 (54"-66" tall) with 69-84 cm saddle. The first WEIZE step into actual gears and suspension.
Stack: 525mmReach: 365mm
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Mountain 18-Speed
🚵 Mountain Bike • 2026Adult mountain/hybrid bike in 26" and 27.5" wheel sizes with 18-speed twist shifters, front suspension fork plus rear coil shock (full dual suspension), and linear-pull V-brakes. Fits riders 5'2"-6'2". A budget hardtail-killer for casual trail and pavement use.
Stack: 595mmReach: 405mm
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Freestyle BMX 20
🧒 Kids Bike • 2026Entry-level 20" freestyle BMX with hi-ten steel frame, 4 stunt pegs, 360° rotor (gyro), and V-brakes. Fits riders 4'0"-5'8" (kids and shorter teens). 32T chainring with 16T freewheel, 170mm one-piece forged steel cranks, 20×2.40" tires.
Stack: 510mmReach: 350mm
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WEIZE Sizing Tips
How to Measure
- • Height: Stand barefoot against a wall and measure from floor to top of head
- • Inseam: Stand with feet 6 inches apart, measure from floor to crotch
- • Arm Reach: For road bikes, measure from shoulder to fingertips
When Between Sizes
- • Comfort priority: Choose the larger size
- • Performance priority: Choose the smaller size
- • Long torso: Size up for better reach
- • Long legs: Size down for better standover
WEIZE Sizing FAQ
Accessories for WEIZE bikes
Helmets, saddles, lights and locks that fit any WEIZE build.
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Bell
Bell Nomad 2 MIPS
This ASIN is Small/Medium 52-57 cm. Check the selected Amazon size/color before checkout.
$84.954.5
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Avasta
AVASTA Kids Bicycle Saddle
Standard saddle rail spacing fits most kids' seatpost clamps. Designed primarily for 12-20" wheel kids' bikes; larger riders may prefer a wider adult saddle.
$20.994.7
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Bell
Bell Lumina 300 Headlight
Tool-free handlebar mount; check bar space around computers, bells, and baskets.
$16.984.3
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Abus
ABUS Granit X-Plus 540
Inner dimensions: 5.5" x 8" (14 x 20cm). Premium size for frame + wheel security. Heavy-duty for high-theft areas.
$159.00
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Camelbak
CamelBak Podium Chill 21oz
Standard 73mm bottle diameter. Optimized cage fit for most bike bottle cages.
$13-184.6
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Giro
Giro Register MIPS
S 51-55 cm, M 55-59 cm, L 59-63 cm
$83.194.7
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WEIZE Comparisons & Guides
Find Your WEIZE Size
Use our free calculators and guides to determine your ideal WEIZE frame size.
Road Bike Calculator
Calculate your WEIZE road bike size
Mountain Bike Calculator
Find your ideal MTB frame size
General Calculator
Universal bike sizing tool
Saddle Size Calculator
Find your ideal saddle width
Continue Reading
How to Choose the Right Bike Size
Frame size, standover height, and reach explained
Complete Bike Fitting Guide
Dial in saddle height, reach, and handlebar position
Kids Bike Size Guide 2026
Age & height charts, wheel sizes, and safety tips
Saddle Comfort Tips
Solve discomfort with proper saddle selection and positioning