| Brand | Model | Year |
|---|---|---|
| BMW | R 100 S | 1976 |
| BMW | R 100 S - 0324 | 1977-1978 |
| BMW | R 100 S - 0376 | 1979-1980 |
| BMW | R 100 T - 0375 | 1978-1980 |
| BMW | R 100/7 - 0304 | 1976 |
| BMW | R 100/7 - 0323 | 1977-1978 |
| BMW | R 90 S - 0272 | 1973-1974 |
| BMW | R 90 S - 0276 | 1975 |
| BMW | R 90 S - 0284 | 1976 |
Wirth -made in Germany- progressive fork springs are an upgrade of conventional springs. While conventional fork springs have the same spacing all the way down, progressive fork springs are wound tighter at one end – as the suspension is compressed the springs become stronger, for improved handling when the going gets rough without disturbing handling in normal conditions.



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