Ridgeback Dimension 20 - 2026
The lightweight Dimension 20 is the perfect kids bike for riders aged 5½ and upwards who are making the exciting move to gears and going further than ever before!
Designed with a light aluminium frame, fork and parts, the Dimension 20 is easier to manage, making every ride smoother and more enjoyable. Wide-range 7-speed Shimano gearing tackles the ups and downs with ease, while an adjustable fit ensures the bike grows along with your little rider.
Easy-Pedal Cranks — Our pedal cranks are ergonomically correct, proportional to the child's leg length. They also place the pedals closer to the bike's centre so that children can pedal as smoothly and naturally as possible.
Smaller Grips — Our handlebars and grips are narrower diameter so they fit small hands better, for confidence and control as well as better ability to reach the brakes safely.
Faster Tyres — Special edition Nutrak Speedsters with puncture resistance and reflective sidewalls roll comfortably and smoothly.
Lowered Frames — Our frames are lower where it counts, making it easier to get on and off and increasing clearance for greater confidence.
Steering Limiter — To help prevent falls when learning to co-ordinate pedalling and cornering, the steering has a limit stop that helps avoid an over-steering situation.
Specifications
Age Range: 5.5 to 8.5 years
Height Range: 112cm to 130cm
Inside Leg Range: 50.5cm to 61cm
Frame: Butted 6061-T6 heat-treated aluminium
Fork: 6061-T6 heat-treated aluminium
Handlebars: 19.0mm OD grip area, 520mm W, 40mm rise, 10° sweep
Grips: 19.0mm ID Velo grips, Kraton rubber
Stem: 40mm extension, 10° rise, 25.4mm clamp
Saddle: Madison, soft PU foam padding, 236L x 140W
Seat Post: 27.2 x 250mm, all aluminium
Headset: Upper: ZS44/28.6 | Lower: ZS44/30
Tyres: Nutrak by Vee - Speedster 20" x 2.0", reflective strip and flat-resistant belt, natural colour sidewall
Rims: Aluminium, machined sidewall with wear indicators, 32H F+R, Car-type valve
Front Hub: Aluminium, M6 bolted axle
Rear Hub: Shimano FH-N300 freehub, nutted axle
Shifters: Shimano SL-M315 trigger shifter, Jagwire LEX-SL lubricated cable housing
Rear Mech: Shimano RD-TY200 short cage w/ protective bash guard
Cassette: Shimano CS-HG210 cassette, 7 speed, 12-32T
Chain: KMC, silver/grey finish
Cranks: Forged aluminium, low Q-factor design, 114mm length
Chainring: 34T, aluminium, double chain retention discs
Bottom Bracket: Thun Germany, sealed bearings, CrMo 113mm axle
Pedals: Nylon resin compact pedals, ball-bearings
Brake Levers: Promax BL367-AL, reach adjustable, aluminium body
Brakes: Aluminium V-brake, adjustable linear spring, Jagwire LEX-SL lubricated cable housing
