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Track tyres and the size game - Hardtuned.net

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Track tyres and the size game 

225 235/45 or 235/40 or 245/40
10 replies to this topic

#1 davidg2152

  • Joined:13-March 16
  • Location:Australia ACT
  • Car:S13 SR20DET

Posted 26 February 2017 - 02:36 PM

Well my 888R's are closing in on retirement and I want to try and neaten up the nugget for consistency.

I currently have 225/45/17 front and 235/45/17 rear Toyo 888R's.

I have been told Nitto NT01's are pretty similar (made by Toyo) and have a 100TW. I want to give em a go (unless something else pops up) but they come in either 225/45 (and I dont want to take tyre away) or 235/40 and 245/40 widths.

I run a 17x8 Lenso D1 rim.

From my calcs the 235/40 should be fine and the reduction (albeit sweet FA) in rolling diameter will only assist acceleration.

Has anyone played with this at all and any experiences I can learn from?

Car is 100% track only.

#2 boost-it

  • Joined:03-January 06
  • Car:180sx Type X

Posted 27 February 2017 - 10:25 AM

r888r is a faster compound than the nt01. i have run nt01 for a while now and they are a good entry level semi slick. they feel almost very much like a fast road tyre than a semi slick tbh.

when you step it up to the hankook z221 or the advan ao50 the grip level is on another level.

as for tyre sizing find a combination dont wont rub or limit your castor settings/alignment. 225 is a little on the skinny side and is an unpopular size for semis.

#3 davidg2152

  • Joined:13-March 16
  • Location:Australia ACT
  • Car:S13 SR20DET

Posted 27 February 2017 - 01:23 PM

Great advice mate. I was told the Nitto is actually a Toyo as from same factory but as you have used them I will run with it.

Would a 235/40/17 work on a 17*8 or even a 245/40?

I think the 235s should be able to somehow go on the front of it witjout too much drama?

#4 boost_bus180

  • Joined:18-December 05
  • Location:Australia ACT

Posted 27 February 2017 - 03:47 PM

I've had 235/40 and 255/40 NT01 tyres on 9" rims and to be honest there wasn't that much of a visible difference in the sidewall angle when fitted and on the car. not as much as I expected anyway. I think a 235/40 on a 8" rim would be ok, but it will be a bit sloppy compared to it on a 9" rim. that said, I remember one of the guys in QLD with the yellow silvia (SC_180 or something arather) had 255/40 all round on 9" rims with no issues, so going by that your 235 on a 8" rim will probably be fine

Edited by boost_bus180, 27 February 2017 - 03:54 PM.


#5 davidg2152

  • Joined:13-March 16
  • Location:Australia ACT
  • Car:S13 SR20DET

Posted 27 February 2017 - 10:36 PM

I currently have a 235/45 on the rear
thought a 235/40 on front woukd take away any scrub issues

#6 Varvs

  • Joined:21-December 07
  • Location:Australia NSW
  • Car:97 180sx Type X

Posted 28 February 2017 - 08:57 AM

I have 235/4517s on 8" and they rub a bit at full lock. thats RE003s though, not semis.

sidewalls are flush with the face of the wheel.

#7 davidg2152

  • Joined:13-March 16
  • Location:Australia ACT
  • Car:S13 SR20DET

Posted 28 February 2017 - 05:57 PM

Thanks mate do they scrub on inner or on the actually gourd lip?

#8 boost_bus180

  • Joined:18-December 05
  • Location:Australia ACT

Posted 01 March 2017 - 04:52 AM

Your wheel offset, and to a lesser extent your ride height, will be the determining factors of where and when your tyre scrubs. 235/40 is a very conservative size tyre to use on a silvia and can fit just fine. You're stressing over nothing here

#9 Varvs

  • Joined:21-December 07
  • Location:Australia NSW
  • Car:97 180sx Type X

Posted 01 March 2017 - 05:25 PM

scrubs on the inside and depending on incline, the outside catches in the tread grooves.

castor plays a big part too as it moves the wheel further forward, closer to the guards.

#10 Dose Pipe Sutututu

  • Joined:19-January 05
  • Location:Australia NSW
  • Car:Boat Sutututuutu

Posted 02 March 2017 - 06:43 AM

a 235 section semi and a 235 section non semi will be noticeably different in terms of overall tyre with.

If a 235 road tyre is scrubbing going to a 235 semi will scrub even more due to the thicker side walls.

#11 davidg2152

  • Joined:13-March 16
  • Location:Australia ACT
  • Car:S13 SR20DET

Posted 02 March 2017 - 07:46 AM

copy mate.
I guess is using a 235/40 over a 225/45 actually going to achieve anything really.






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