WEIZE Bike Size Chart
Size chart and fit guide for 2026
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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) |
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) |
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).
WEIZE 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.
WEIZE 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.
WEIZE 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.
WEIZE 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.
WEIZE 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.
WEIZE 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.
WEIZE 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.
WEIZE 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.
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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 barefoot with feet 6 inches apart, press a level book firmly upward, and measure from the floor to its top edge
- • 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.
Bell
Bell Nomad 2 MIPS
This ASIN is Small/Medium 52-57 cm. Check the selected Amazon size/color before checkout.
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.
Bell
Bell Lumina 300 Headlight
Tool-free handlebar mount; check bar space around computers, bells, and baskets.
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.
Bivo
Bivo Duo 25 oz Stainless Bottle
Fits most major cages, but the 77 mm maximum diameter is a touch larger than a standard plastic bottle. Check tight side-load cages on very small frames.
Giro
Giro Register MIPS
S 51-55 cm, M 55-59 cm, L 59-63 cm
WEIZE Comparisons & Guides
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