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Thread: Hoosier R7s size

  1. #1
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    Hoosier R7s size

    So, just got these today, they are huge. 245/40/17 next to a Maxxis 255/40/17 RC1

    Doug (BMWCCA HPDE Instructor, Respect My Authoritay!)

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  2. #2
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    They are a bit bigger than an R6 too. Ran them at Chuckwalla this past weekend, and the rear fenders required some love with a hammer and jack handle to keep from rubbing.

  3. #3
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    Man I'm hoping when they finally release the A7 275/35-17 that it "grows" too!!

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    "Purple crack".

  5. #5
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    The 225/45/15 A6 and the 225/45/15 R7 are the exact same size. Loved the lack of drop off in the R7 that I always had with the A6

  6. #6
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    Hoosier R7s size

    I just saw where Hoosier has a size that I havent seen before. It seems just right for S13s but the specs seem off. 255/35/18 24.8 tall, 10.3 in. tread, 9 in wheel Their 275s have 10.3 in tread.

  7. #7
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    I had to cut out the inner lip of the rear fenders to fit 245 40 17 R7 or A7's on my GTS2 car. The R7's at also seemed to take a little longer to get up to temp as compared to the R6's. They do seem to last a little longer however.

  8. #8
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    I didnt take another picture but laying next to a 255/40/17 NTO1 was about the same as the RC1s. The good thing is they fit. My fenders are very rolled and pulled in some areas.
    Doug (BMWCCA HPDE Instructor, Respect My Authoritay!)

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  9. #9
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    Quote Originally Posted by batista View Post
    I just saw where Hoosier has a size that I havent seen before. It seems just right for S13s but the specs seem off. 255/35/18 24.8 tall, 10.3 in. tread, 9 in wheel Their 275s have 10.3 in tread.
    That tire size was built for a "spec" series that had a max tire width of 255. They were liberal in their interpretation of the 255 width and the +/- allowance that the NHTSA gives for measuring tires. I had those tires on 18x9.5 wheels on the car in my avatar. They stuck like glue but I couldn't get the car low enough at the time because I hadn't done fender mods to clear the extra width.
    Last edited by jakermac; 02-12-2015 at 12:00 AM.

  10. #10
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    Here is a comparison of a 245 R6 vs 245 R7. The only difference is that the R6 is a 245/40/17 while the R7 is 245/35/18. Technically its just a sidewall difference and width should be same 17 vs 18.

    We had to do quite a bit of fender work to fit the R7's and get the height of the car to where we wanted. Had to do evo fenders front and pull A LOT on the rear.




  11. #11
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    Here's an S13 with those 255/35-18 A6s on 18x10.5" wheels:


  12. #12
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    Quote Originally Posted by batista View Post
    I just saw where Hoosier has a size that I havent seen before. It seems just right for S13s but the specs seem off. 255/35/18 24.8 tall, 10.3 in. tread, 9 in wheel Their 275s have 10.3 in tread.
    255/35/18 has been around for a while. It was actually considered a cheater tire in NASA TT because it measured closer to a 275... much wider than the 255 number suggests.

    Has anyone compared the width difference between a 225/40/17 R7 and a 245/40/17 R7? I know where wasn't much difference between the R6's in the same size, the 225's run WIDE!


  13. #13
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    Anyone get tire pressures/setup dialed in on the R7s yet? I've heard people say run them higher and others lower than R6.

    Ran them the same as the R6s last weekend, but something tells me they have more to give with some adjustment.

  14. #14
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    Quote Originally Posted by alwaysinboost View Post
    Has anyone compared the width difference between a 225/40/17 R7 and a 245/40/17 R7? I know where wasn't much difference between the R6's in the same size, the 225's run WIDE!
    Is this true for 16s as well? I'm trying to decide between the 225s in 16 or 17 this year

  15. #15
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    Quote Originally Posted by alwaysinboost View Post
    Has anyone compared the width difference between a 225/40/17 R7 and a 245/40/17 R7? I know where wasn't much difference between the R6's in the same size, the 225's run WIDE!
    I'm curious about this is well, although for 225/45/17. From my usual supplier the 225s are $254 less for a set. A racer compared 225/45/15s for R6 vs R7 and they were almost exactly identical, no real width change. But we all know the 245/40/17 R7 is wide as hell, so I'm curious what the 225/45/17 carcass is like. Hell, if I could find a junk one I'd do it myself, I already got a junk 245/40/17 R7.

  16. #16
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    I have compared the 225/45 and 225/40 and the 40 series is just a little bit wider when mounted.


  17. #17
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    What's the scoop on fitting a 245/40/17 R7 on a 17x9" wheel (ARC-8) on an E36?

    Anyone know how it compares in width to a 255/40/17 NT01?
    Last edited by TXBDan; 05-17-2018 at 03:57 PM.
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  18. #18
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    Fenders need to be pulled and rolled. Lots of negative camber front and rear. the R7 is at least a half inch wider than the NT01. Its more like a 275. This is next to a 255 Maxxis RC1


    - - - Updated - - -

    20150210_172520.jpg
    Doug (BMWCCA HPDE Instructor, Respect My Authoritay!)

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  19. #19
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    Wow, that's no joke. That ain't fitting. My 255 NT01s rub quite a bit in the back.

    Thanks
    Last edited by TXBDan; 05-15-2018 at 04:31 PM.
    COMSCC T70 E36 M3

  20. #20
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    just roll your fenders. I think I beat the inside in some with a Ford tool as well. they fit with no rubbing when i was done. I think I ran a small spacer in the rear as well.
    Doug (BMWCCA HPDE Instructor, Respect My Authoritay!)

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  21. #21
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    Quote Originally Posted by TXBDan View Post
    Once the scoop on fitting a 245/40/17 R7 on a 17x9" wheel (ARC-8) on an E36?

    Anyone know how it compares in width to a 255/40/17 NT01?
    Before I did flares (which meant lots of cutting, swearing, welding the inner sections together, etc) I ran 245 R7s on ARC8 17x9 42 offset wheels with pulling and not just rolling, but grinding off the inner lip of the rear fenders. In order to get the car at a decent ride height, it takes a bit of effort, but is doable without totally hacking up your car. Fronts aren't really a problem, just watch the clearance between the tire/wheel and spring perches.

  22. #22
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    I think i'll stick with 225s at least for now. Anybody try 225/40r17s for a little gearing advantage?
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  23. #23
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    I run 225/40/17 on 9.5 wheels. I think with my 3.46 diff it comes out to like a 3.55 ratio. Works great at the tracks I’ve run them so far.
    @Shut_up_racing

  24. #24
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    Quote Originally Posted by Pat533i View Post
    I run 225/40/17 on 9.5 wheels. I think with my 3.46 diff it comes out to like a 3.55 ratio. Works great at the tracks Iíve run them so far.
    Nice, i have a 3.46, too. I think the effective ratio is 3.59.

    225/40s ordered!
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  25. #25
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    Quote Originally Posted by Pat533i View Post
    I run 225/40/17 on 9.5 wheels. I think with my 3.46 diff it comes out to like a 3.55 ratio. Works great at the tracks I’ve run them so far.
    Have you ever run a 245 Hoosier on that wheel and made any comparisons, or compared it to running a 245 40 17 on a 9 inch rim?

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