Jett

kids350–549 EUR

Origin

Next-generation children's bike designed around how kids actually grow — adjustable fit system to extend usable life beyond typical 1-year kids bike window Specialized with Retül bike fitting team — kids' proportions studied via dedicated research group Jett — speed, energy, momentum. Same spirit as the adult Jett women's MTB but completely different product. Giant ARX, Trek Precaliber, Cannondale Trail Kids, Woom bikes

Specifications

Frame: Specialized A1 Premium Butted Alloy, unisex kids frame, internal routing, 135×10 mm forged dropouts, replaceable hanger. Retül kids-fit designed.
Weight: kg
Drivetrain: microSHIFT RD-M26S 1×7, 34T chainring, SunRace 11-34T cassette (Jett 20 Multispeed); single-speed on coaster/base models.
Brakes: V-brake (rim) front and rear, tool-less reach-adjust kid levers. Not disc.
Wheels: Alloy rims 23 mm internal, 28H, 100 mm front / 135 mm rear; 16"/20"/24" by model.

The verdict

+Strengths

Adjustable crank (105/125mm) extends usable fit range significantly vs fixed crank kids bikes
Adjustable handlebar reach — addresses faster arm growth in children
A1 aluminum frame — lightweight for a kids bike
Retül-designed kids' proportions — saddle width, grip diameter, brake reach all child-specific
Body Geometry 130mm saddle — comfort-focused
Replaceable derailleur hanger — repairable after crashes
Internal cable routing — clean, protected
Pathfinder Sport 2.0" tires — versatile on pavement and light gravel
Three color options per size — fun for kids

−Weaknesses

V-brakes — less powerful than hydraulic disc, especially in wet conditions
Alloy fork — heavier than carbon, no vibration damping
No suspension fork — rigid setup limits rough terrain capability
Single-size only per wheel — no adjustable fit within a wheel size (need to size up wheel)
Price (€350–549) above budget kids bikes — may be hard to justify for fast-growing young children

Did you know

01Designed using Retül data from a dedicated kids' research group — same fitting technology Specialized uses for professional cyclists
02Adjustable cranks (105/125mm positions) are unusual in kids' bikes — most use fixed crank length
03Kids' arms grow faster than their torso — Jett's adjustable handlebar specifically addresses this
04Marketed as 'one of the lightest kids' bikes on the market' — A1 aluminum keeps weight low
05Tested with 8 different kids aged 7–12 by Two Wheeling Tots — reviewers praised the adjustability system
06Body Geometry saddle (130mm) and 19mm narrow grips reflect the same ergonomic philosophy as adult Specialized bikes
07Replaceable derailleur hanger on a kids' bike — unusual, shows attention to durability and repairability
08Pathfinder Sport tires give light gravel capability alongside pavement use