[J'MM'N]

2.2" wheels first appeared at the 1989 worlds in Australia.

Before the worlds Masami and Yokomo had been testing at St Ives track in Australia and even returned home with dirt samples from the track. From this they developed the tyres and compound that would work on the track. Problem was IFMAR ruling stated that any tyre used at the worlds had to be commercially available. Tyres were made commercially available by Yokomo directly before the worlds started and Yokomo were even happy to give out the tyres at the worlds.

Cunningly no other manufacturers had anything near a 2.2" wheel, so they had no way of using them. It was a big advantage to Yokomo drivers, although other manufacturers thought it very unfair. Yokomo also released the TH-1 wheel adapters at the same time, so all Associated drivers could use the Yokomo wheels on RC10's.