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2023 RADIO

ZUMA 20″

A 20″ aluminum frame mountain youth bike with promax mechanical disc brakes.
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Weight21.7 lbs  
FrameAluminum
SuspensionRigid
ForkAluminum
Wheels20″ Aluminum
BrakesPromax Mechanical Disc
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Insights
Ride Feel

Based on frame geometry and build specs.

Handling
nimblestable
ZUMA 20″
Other Mountain Youth bikes
Geometry
Specs
Build
Frame

RADIO “ZUMA 20” frame, 6061-T6 alloy

BB StandardBSA, Threaded

ColorsBlack; Yellow; Cyan

Fork

RADIO “ZUMA 20” straight rigid fork, 6061-T6 alloy

Bottom Bracket

RADIO bb set, BSA, square taper, sealed bearing

Headset

FSA A-headset, loose ball

Stem

RADIO “ZUMA 45” frontload stem, alloy, 45mm reach

Handlebar

RADIO “ZUMA 20” bar, 6061-T6 alloy, 31.8mm bar bore, 1″rise

Saddle

RADIO “ZUMA 2024” railed seat

Seatpost

PROMAX “SP-2019” seat post, alloy, multi-adjust, 300mm

TypeRigid

Pedals

RADIO “JUNIOR” pedals, nylon

Grips

RADIO “ZUMA” grips, 110mm, flangeless

Groupset
Crank

RADIO “ZUMA” 3pc crank, forged alloy, 145mm length

Cassette

RADIO sprocket, steel, 32t, narrow wide

Chain

KMC chain, Z1 narrow type, 1/2″ x 3/32″

Brakes

PROMAX “DSK-310” – mechanical disc front & rear brake

TypePromax Mechanical Disc

Brake Levers

PROMAX “BL-367” lever, alloy

Wheels
Rims

Front: RADIO “J25SE” rim, alloy, double wall, Rear: RADIO “J25SE” rim, alloy, double wall

Front Hub

RADIO disc hub, alloy shell, loose ball, QR crmo axle, 20h

Rear Hub

RADIO “ZUMA” disc cassette hub, alloy, sealed, QR, 20h

Tires

VEE TIRE “CROWN GEM” tires, 2.25″ front & rear

Rider Notes
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First added December 6

Last updated July 13

Not listed for 685 days