Enkei RPF1 rim width/offset for Nitto NT01 235/40-17 tire?

[dp1]

Measured rim width for 235/40-17 NT01 is 8.5".
Light 17x8.5 rims are not plentiful and good ones can be expensive (i.e., Volk TE37). I don't want to break the bank if I get wheels off on track and need replacements, so going with RPF1.
HPDE (track) and AX use.
Running -3f/-2.5r camber at just under 1" drop, Ohlins R&T, AP Racing Sprint BBK.

I know that NT01 will fit both 17x8 and 17x9 rims. I think that a little wider is better (when in between) to handle tire flex during hard cornering and to avoid having to run higher pressures to compensate.

Looking at 17x9 +35.
Not sure if I would need spacers with +45, may be tight but would most likely clear BBK and wouldn't rub - want to make sure that there is no rubbing anywhere when pushing on track/AX.
17x9 also fits 245/40 size perfectly so I can try Hankook Ventus RS-3 next.

Any reason to go with +45 over +35?

Also, if someone in tri-state has black or bronze RPF1 in 17x9 +35 or +45 for sale (no repairs or significant curb rash, straight), let me know what you have.

Thx

[G-Man]

are you asking about 17x8 +45 vs 17x9 +35? becuase I thought we already got you covered in the 17x9+35/45 over here

here are their confirmed fitments from their website
Enkei RPF1 17x7.5 +48
Enkei RPF1 17x8 +35
Enkei RPF1 17x8 45
Enkei RPF1 (very tight fit, but works) 17x9 +35
Enkei RPF1 18x9.5 +38

17x9 +45 will not fit the sprint kit without spacers

AP racing fitment thread

Essex fitment guide

[dp1]

Originally Posted by G-Man

are you asking about 17x8 +45 vs 17x9 +35? becuase I thought we already got you covered in the 17x9+35/45 over here

here are their confirmed fitments from their website
Enkei RPF1 17x7.5 +48
Enkei RPF1 17x8 +35
Enkei RPF1 17x8 45
Enkei RPF1 (very tight fit, but works) 17x9 +35
Enkei RPF1 18x9.5 +38

17x9 +45 will not fit the sprint kit without spacers

AP racing fitment thread

Essex fitment guide

You got me covered here and there, thanks again

Should have just added this to the other thread - since that post, somebody (quite experienced with our cars) mentioned to consider 17x9 +45 and spacers for my setup as opposed to +35...didn't have a chance to discuss why. Thoughts on that?

I am hoping for feedback about 17x9 RPF1 offset from those own these rims and push their cars on track/AX and use 235/40 or 245/40 tires, and have coilovers, and use -2.5 or more negative camber all around.

I am also hoping for feedback from those who know from track/AX experience if 17x9 is a better fit than 17x8 for NT01 in 235/40 size that's intended for 17x8.5 rim width.

I see that +35 clears the BBK without spacer, and I don't mind using spacers to get the most optimal setup for +45.
I don't care about the looks (poke, etc), only fit/performance.

Much appreciate feedback

[G-Man]

I cannot think of any benefits to using spacers at all unless you have clearance issues or already own the +45. I run 17x9+35 weds tc105n with no problems on 245/40/17.

Maybe there is something to getting the extra clearance because they are afraid of how close they are to the BBK, but AP racing and i think the whole RPF1 +35 thread says they have never had anything hit maybe someone else can chime in on anything that is being forgotten.

[dp1]

Originally Posted by G-Man

I cannot think of any benefits to using spacers at all unless you have clearance issues or already own the +45. I run 17x9+35 weds tc105n with no problems on 245/40/17.

Maybe there is something to getting the extra clearance because they are afraid of how close they are to the BBK, but AP racing and i think the whole RPF1 +35 thread says they have never had anything hit maybe someone else can chime in on anything that is being forgotten.

Great feedback, thanks

I think that I read that +35 can rub in the rear a little with no or little negative camber (I believe it was on 245/40, will check), and I'm looking at -2.5 to -2.8 rear camber on a 1" drop, so probably not a concern in the rear. If I got +45, there should be no rubbing with this camber in the rear, without spacers.

I wonder if 10mm spacer with +45 in the front gives the same clearance as +35 with no spacer.

Sorry to be a pain but want to make sure I do this right the first time, as it's easy and safe to use 5-12mm spacers for fine-tuning but with +35 I'm stuck if it rubs on track.

I already have 235/40-17 Toyo RA-1 on 17x8 RPF1, shaved and heat cycled and with 3-4/32 tread. They worked really well on track and AX, with and without 12mm spacers, but they get a little squirmy at the limit...it may be the driver and JRSC

Got NT01 to see if breakaway and recovery works a little smoother.

Thanks again!

[dp1]

I'll try again...

If you:
- own RPF1 in 17x9 and 235-245 width tires
- track the car (drive over curbs, etc)
- have AP Racing Sprint kit
- have coilovers
- have at least -2 deg camber all around
- experience no rubbing

...which rim offset did you go with (+35 or +45) and what spacers are you using, if any? Thx

[CSG Mike]

+45 is lighter than +35, even if you add the weight of spacers and extended studs.

You WILL need spacers with the +45 to clear the AP kit.

+45 in 5x100 is less common than +35.

Disclaimer: I run a 17x8.5 +55 wheel on my personal car... but they're BBS :p

[dp1]

Originally Posted by CSG Mike

+45 is lighter than +35, even if you add the weight of spacers and extended studs.

You WILL need spacers with the +45 to clear the AP kit.

+45 in 5x100 is less common than +35.

Disclaimer: I run a 17x8.5 +55 wheel on my personal car... but they're BBS :p

Thank you @CSG Mike. What size spacers to clear AP BBK? Already have 12mm spacers but can get different size if needed.

I am also looking at potentially buying 17x8.5 rims, the best size for 235 and many 245 tires...unicorns are easier to find unless one spends over $2,500 on a set...still looking. I have a feeling that NT01 (thanks for the PM) in 235 width will serve me very well for track and AX.

[CSG Mike]

Originally Posted by dp1

Thank you @CSG Mike. What size spacers to clear AP BBK? Already have 12mm spacers but can get different size if needed.

I am also looking at potentially buying 17x8.5 rims, the best size for 235 and many 245 tires...unicorns are easier to find unless one spends over $2,500 on a set...still looking. I have a feeling that NT01 (thanks for the PM) in 235 width will serve me very well for track and AX.

I have no idea... but the 12mm should be fine.

You should consider the Maxxis RC1 in 235 as well; they're faster than the NT01 in cooler weather.