Hi All,
I have been running the stock gearing on my 04 550 and it seems to be about right for me. With the stock rear tire out where I ride, it sort of felt under geared for the desert. But, after proper suspension set up, and more so a brand new set of Michelen s-12 tires it seems about right. Still low enough for the really, really tight stuff, and 96 mph on the dry lake. I think if anything, maybe just slightly lower gearing might be the ticket. On my 01 501 I went to 16-52 which is 3.25:1, compared with the stock 3.2:1. I did this for two reasons 1) less wear on the chain, bigger diameter on the front is the main benefit here, and 2) I wanted to try and prove out a theorr I had read about the effect of sproket diameter's on suspension performance. Seems the bigger sprokets you run, mainly the back I believe, helps to alleviate binding forces that the chain exerts through engine torque on the rear suspension. I don't know if it made that much of a difference b/c I never tested this by switching chain/sproket sets. But I do know that set of chain and sprokets lasted 18 months, and that I did notice the slight gear change. And it seemed to have tightend up the box just enough for better selection in those awkward situations. And for the record I have been running the DID 520 VMX chain and sproket specialties sprokets, and I use Maxima chain wax as the lube.