Woom designs lightweight, child-specific bikes and accessories from the ground up. Every component - from helmet shells based on thousands of head scans to bells with kid-friendly thumb levers - is engineered for small hands, low weight, and confidence-building ergonomics.
Measure head circumference at the widest point across the forehead. Most brands size: XS (50-53 cm), S (53-56 cm), M (56-59 cm), L (59-62 cm), XL (62+ cm). Kids
As an Amazon Associate we earn from qualifying purchases. This helps support our free calculators.
Lumens guidance: 100-200 for being-seen commuting, 300-600 for mixed urban, 800-1500 for unlit trails/roads, 2000+ for technical MTB night riding.

Woom
Designed specifically for the woom Ready Kids' Helmet - clips into the top rear ventilation hole. No tools required.

Woom
Tool-free silicone strap mounts fit most kids' handlebars and seatposts. Compatible with woom bikes and the woom POP basket.
As an Amazon Associate we earn from qualifying purchases. This helps support our free calculators.
Match basket capacity to commute load (typically 7-25L). Confirm handlebar diameter compatibility (standard 22.2mm, 25.4mm, or 31.8mm). Check fork/rack clearanc
As an Amazon Associate we earn from qualifying purchases. This helps support our free calculators.
Match lock value to bike value (rule of thumb: spend ~10% of bike value). Inner U-lock dimensions need to clear frame + wheel + secure object. Standard U-lock:
As an Amazon Associate we earn from qualifying purchases. This helps support our free calculators.
Confirm handlebar diameter (22.2 mm flat-bar / 23.8 mm drop / 31.8 mm oversized). Many bells use shims, rubber bands, or universal mounts to fit multiple diamet
As an Amazon Associate we earn from qualifying purchases. This helps support our free calculators.
Standard cycling bidons are 600-750 ml and fit any 73 mm-OD cage; larger 1 L touring bottles may need side-load cages on small frames (see the bottle cages guid
As an Amazon Associate we earn from qualifying purchases. This helps support our free calculators.
Pumps don't size to riders, but three specs decide whether a pump actually fits your bike. First is valve compatibility - Schrader (the fat car-style valve, com
As an Amazon Associate we earn from qualifying purchases. This helps support our free calculators.
Measure hand circumference at the widest point across your palm, just below the knuckles, with the tape snug but not compressing the hand. Exclude the thumb. Mo
As an Amazon Associate we earn from qualifying purchases. This helps support our free calculators.
Not sure if Woom is right for you? Our head-to-head accessory comparisons put the top brands side by side - readers cross-shop Woom with Knog, Lezyne, CamelBak, Crane Bell Co. and Fidlock.