Compare bikes: Compare Btwin Rockrider 540 (2020) vs. Specialized Riprock Coaster 12 (2020) - Findabike

KMC Z510, single-speed, anti-drop, 1/2"x1/8"

Hi-Ten steel, 76mm

Hi-Ten steel

Specialized A1 Premium Aluminum

Front: Bolt-on, 95mm spacing, loose ball bearings, 16h - Rear: Coaster brake, bolt-on, loose ball bearings, 110mm spacing, 16T cog, 16h

12" alloy, 16mm depth, 21mm internal width

Stainless, 14g

Front: Rhythm Lite, 30 TPI, wire bead, 12x2.3" - Rear: Rhythm Lite, 30 TPI, wire bead, 12x2.3"

Tyres designed for urban riding, efficient and highly visible thanks to its reflective strip. 24-inch 1.7 to 2.2 cross-section inner tube with Schrader valve.

Because children have smaller hands than adults, it's not always easy for them to reach the brake lever. This is why our engineers and designers have designeda brake lever closer to the handlebars that is easier to hold. The brakes are now in reach of little hands! - Two V-Brake pads for effective braking.These brakes are composed of callipers that exert more or less pressure on the rim to slow or stop the rotation of the wheels.

Front: V-brake w/ tool-less reach adjust brake lever

BMX, steel, 10-degree backsweep, 4-degree upsweep, 65mm rise, 470mm width, 22.2mm

Specialized, slip-on

A saddle carefully designed to adapt to the morphology of children. It is equipped with a plastic section on the rear (a bumper) to protect against any impacts.

Specialized Kids'

Steel, 22.2mm

Nylon platform w/ reflectors