Kids love the "roaring engine noise" that the wheels of the BIG-Bobby-Car make when they're driving over asphalt. Many parents would perhaps prefer something a little quieter. The BIG-Whisper-Wheels wheel set is the ideal alternative and can be retrofitted to the BIG-Bobby-Car-Classic. The special rubber compound ensures significantly quieter motoring in the garden and nursery. The wheel set can be fitted to all BIG-Bobby-Car-Classics using the fitting tool supplied. To do this, the hat clips must be removed from the wheels already fitted. The set also includes attachment clips and simple fitting instructions.