Standard fork on 2000 - 2003 was 43mm WP. Ohlins fork was on 2001 SE models and optional on 2002 & 2003. I don't remember ever seeing Ohlins forks stock on a 2000, but probably was an option (anythings possible with GasGas). I had an 01 and 03 with WP forks and another 03 with Ohlins fork option. Ohlins was MUCH MUCH better than the WP. However, I don't think the performance is any better than the revalved 45mm Shivers I have now. I probably would prefer the Ohlins fork over the Shiver for durability reasons though.