i havent heard the width max,and the softness these tires are a 57, so they better recalculate there. and the gear, i dont know yet. we normally run a 390 at springfield were we run most of the time. im going to try a 410 and a 342. they all worked before there, but the 90 was always the best, im not sure about that now. i will know more for myself this weekend when i go to springfields playday! But these tires are wider then the feds or the BFG's they were a 7 and these are a 8 inch! these things look mean on the car though. only thing thats going to suck about these tires is the sidewalls, you cut it just alittle bit, there going flat and your done, tire is junk... and i hope everyone is careful this year, because these things are really a open wheel car now , since the tires stick out so far. would hate to see anyone go tumbling! i have been there done that. not fun at all, couldnt walk for a month after I rolled...