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. Selected Amazon listing: WEIZE Freestyle BMX Bike 20 inch Trick Bicycle. This offer is size 20, color Silver. Check the selected variant and mounting or fit requirements before ordering; other family variants are separate listings.
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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 Jr. MIPS Youth Bike Helmet - Matte Pink (2022), Universal Youth (52-57 cm)
Universal Youth, 52-57 cm.
Avasta
AVASTA Small Kids Saddle - Black
This offer is size S (For 12-20" Bike), color Black. Check the selected variant and mounting or fit requirements before ordering; other family variants are separate listings.
Bell
Bell Lumina 300 Headlight
Tool-free handlebar mount; check bar space around computers, bells, and baskets.
Abus
ABUS Granit X-Plus 540 - 9-Inch with USH Holder
Selected 9-inch shackle version with USH frame holder. Holder fits frame tubes 0.59-1.38 inches in diameter. Check clearance around the frame, wheel and fixed rack before ordering.
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 Fixture MIPS Bike Helmet - Matte Black/Grey - Universal Adult (54-61 cm)
This offer is size Universal Adult (54-61 cm), color Matte Black/Grey. Measure head circumference and check the manufacturer size chart and certification label. Children under one year should not ride as bicycle passengers.
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