Buying a bike for your child can be daunting, that’s why we developed the ZUMA range to make it that much easier. Based around the concept of a kid sized MTB bike, the ZUMA bikes are incredibly lightweight, with carefully researched geometry and designed specifically around smaller riders as the perfect balance between a bike for a child to learn the basics on, and a more advanced MTB for off-road riding conditions for weekend rides with the parents.

With a full range of sizes from 14” for the first-time rider, all the way through to a 26” wheeled machine for the aspiring rookie, there is a ZUMA for every rider. These carefully spec’d bikes feature a super lightweight alloy frame and fork with double wall rims and children specific aftermarket components from PROMAX, KMC, FSA, Vee Rubber and Satori, making them suit the rider’s size perfectly, but look, feel and ride just like a high-end full adult size MTB.

Children are the future, and the ZUMA line is designed to give them the best possible start in for that future…

Specifications:

Frame : RADIO “ZUMA 20” frame, 6061-T6 alloy
Fork : RADIO “ZUMA 20” straight rigid fork, 6061-T6 alloy
Handlebar : RADIO “ZUMA 20” bar, 6061-T6 alloy, 31.8mm bar bore, 1″rise
Grips : RADIO “ZUMA” grips, 110mm, flangeless
Stem : RADIO “ZUMA 45” frontload stem, alloy, 45mm reach
Headset : FSA A-headset, loose ball
Brake Lever : PROMAX “BL-367” lever, alloy
Brake : PROMAX “DSK-310” – mechanical disc front & rear brake
Crank : RADIO “ZUMA” 3pc crank, forged alloy, 145mm length
BB : RADIO bb set, BSA, square taper, sealed bearing
Pedals : RADIO “JUNIOR” pedals, nylon
Chain : KMC chain, Z1 narrow type, 1/2″ x 3/32″
Sprocket : RADIO sprocket, steel, 32t, narrow wide
Driver : MICROSHIFT 12-28t, 7speed
Front Hub : RADIO disc hub, alloy shell, loose ball, QR crmo axle, 20h
Rear Hub RADIO “ZUMA” disc cassette hub, alloy, sealed, QR, 20h
Front Rim : RADIO “J25SE” rim, alloy, double wall
Rear Rim : RADIO “J25SE” rim, alloy, double wall
Seat : RADIO “ZUMA 2024” railed seat
Seat Post : PROMAX “SP-2019” seat post, alloy, multi-adjust, 300mm
Seat Clamp : RADIO “SLIM” seat clamp, alloy
Tires : VEE TIRE “CROWN GEM” tires, 2.25″ front & rear
Weight : 9.85kg / 21.72lbs

Frame Geometry:

Toptube: 17.3"
Chainstays: 14.75"
Headtube Angle: 69°
Seattube Angle: 73°
Bottom Bracket Height: 10mm Drop
Standover Height: 7.7"

Radio 2021 Zuma 20″ Complete Mountain Bike - Black