Im looking for new DR'S, and since ive got 4.11's, Im thinking about going to a taller tire. Ive got 285 35 18 555r's now. How will going from a 35 to a 45 effect my gearing? Its really steep right now with the 4.11's and am thinking I can compenate slightly by going to a taller tire. What about the 305's fitting on a 9.5 inch rim? Ive seen 315's on 9.5" inch rims, but dont want to go that wide. Overall, will these fit on the back w/o needing to clearance the wells? How will the taller tre size effect my mph in each gear?

http://cgi.ebay.com/ebaymotors/2-NEW...2em118Q2el1247

 

The main concern with that tire is the size of it. Its 28.78" tall. 28" tall tires sometimes have a hard time fitting in the wheel wells of an F-Body so I can only imagine how much working it would take for that tire to fit in there. I put some on a Marauder, they were huge. As far as your gearing, I believe this site has one, or you can do a google search for Ring and pinion or rear end gear ratio calculators, there are tons out there. You also have to think about how much a street car it is, and how much of a track car it is. Lots to consider. Hope this helped some!

 

That tire will make your 4.11's feel like a set of 3.69's (if they made them) compared to your current tires. But its a huge tire as pointed out in the post above. I run 28" slicks and had to cut the bumper cover. You won't have growth problems with a radial, but it isn't going to be easy.

 

What If if were to run a 305 35 18 on a 9.5 inch rim? Would I need to roll the fenders? Is a 305 too wide for this rim? What about 295's?

 

TTT come on guys simple question that I happen to not know the answer to!

 

The Nitto 555R requires a 10.0" wide wheel. But the Nittos tend to be a bit narrower than the size would appear to indicate. Whether that is specifically true of the 305/35 I don't know. I'd GUESS it would be OK on a 9.5" wide wheel, since a lot of people put the Nitto 315/35-17 on a 9.5" wide wheel with no problems.

A 295 typically requires a 10.0" wide wheel as well.

I don't think you would have to roll the fenders if you put what is typically a narrower than rated tire on a narrower than recommended wheel. But no one can answer the question without knowing the offset of the wheels. The closer your wheels are to a 50mm offset, the less problems you will have with tire clearance to the fenders.