Matts right, the Schumacher mini
pins were developed from the Proline IFMAR pins from the 93 Worlds. Mini
spikes were around at the very end of the 80s in 2", and Schumacher never had any 2.2" wheels and tyres until the release of the Bosscat and Cougar 2 in 1992.
Here's a complete list of Schumachers tyre range from the Bosscat manual, released in 1992.
http://www.vintage-rc.net/manuals/sc...t/640/10-3.jpg