Continental Divide Ride on a 2001-YZ250f, with a few caveats: Low time on the bike <70hrs total. I am org owner hurt at work , now healed and this is what I own; 4.2 gal, GPR, e-line 200w, lighting/license, side stand, rekluse, ZipTy carb mods, bar snake, aluminum body armor everywhere, FMF Q2, MotoPro off road spring& suspension set-up, hand guards, DID ‘O’ ring chain, fresh cam chain, short billet kick arm, and a ‘03’ cam. I’m looking for some knowledgeable advice (other than sell it) on the following technical questions: 1) Gearing; Currently I run a 13/49 for a ratio of 3.77:1 (my research comes up dry for SPECIFICS ie- actual experience, part numbers etc. . . . inserting WR 1st & 5th), I plan on swapping between countershaft sprockets. A 14/45 for the flats @ 3.21:1- and 12/45 for tighter sections giving a 3.75:1. 2) Rear Subframe; I do not plan on camping. I do plan on surviving. I will pack light, but sufficient. How durable is the aluminum subframe ref; weight bearing capacity? 3) Engine time; I have read and heard accounts of the Yamaha motor running well over 250hrs and/or 4000mls. Anyone with actual experience? 4) Tire Balls; will they hold up and alleviate the hassle of flats? 5) Where can I get a 19” 110 Mitas rear trails tire? I appreciate any and all constructive help in advance, thanks.