Replacement tyres for your DMR Sidekick kids bike. Sidekick Balance uses the 12 x 2.25 on the rear and the 14 x 2.25 on the front. Sidekick Pedal uses the 16 x 2.25 on the rear and the 18 x 2.25 on the front. The Sidekick Ride uses the 20 x 2.25 on the rear and front.