This summer I plan on riding the CDR (MT-NM) on my 2001 -YZ250f. My: low-time org piston/rings, fresh cam chain, 4.2 gal, e-line, GPR, rekluse, Moto-Pro suspended, DID O ringed, Trail Tech & tagged, 03 camed, Ty Davis carbed, FMF Q2'd - YZ250f. It is what I own, it has been sitting a lot since a work injury in 2002. The bike is nicely set up, runs great, starts immediately. And . . . . like I said I own it and all the money spent on set up. Advice I seek: 1) Gearing: currently I run a 13/49 that results in a 3.77 raito. I plan on swapping back and forth durring the ride for conditions between a - 14/45 (FLAT TERRAIN)for a 3.21 ratio, and swithching counters to a 12 with a 45r for a 3.75 raito (MTNS) which puts it nearly the same as what I run now. This is the only solution I see as feasible. I estimate a 16% reduction in top end rpm though I don't know what that means yet in MPH. I want to be able to cruise at 55mph for hours. 2) Engine I've read of many engines of this type running well in excess of 250hrs and or over 4,000miles(WR). Mine has maybe 65hrs on it. 3) I do not plan on camping. But I do plan on surviving. I will pack very light. Does anyone have experence on what the subframe can take? 4) Jetting will I be able to get away with a mid-point set up of around 4500'PA? 5) Where can I get a Mitas 19" rear trails tire? 6) Will "Tire Balls" hold up? Thanks ahead of time to any and all for experienced relpies.