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      04-23-2023, 02:55 AM   #1
notslow
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Question Correct tire size for BBS FI-R?

I just got some 19" BBS FI-R and plan to get some mps4s tires.
wheels are 19 x 9.5 and 19 x 10.5.

I'm thinking 265/35 and 295/35,.
295/30 seems to be the rear size that people are mentioning.

Any advise so that the traction control doesn't have any issues?

Thanks

Last edited by notslow; 04-23-2023 at 01:32 PM..
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      04-23-2023, 06:08 AM   #2
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If it helps, I shared my car on same spec FIRs. The rears are 305/30s, but fronts are 265/35. No problems with traction control
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      04-23-2023, 11:34 AM   #3
notslow
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Wow, that is wider than I was thinking in back. It looks good. It's there any downside to using the wider rear?
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      04-23-2023, 12:03 PM   #4
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My understanding (and I’m only going off what I’ve read…someone correct me if I’m wrong) is if you push the car harder, the wider rear may give more understeer. There’s more to it, but I understand it in my empty skull but yet not enough to explain better.
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      04-23-2023, 08:44 PM   #5
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265 and 305…all day long.
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      04-23-2023, 10:53 PM   #6
notslow
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Looking at the weights on michelin site and it shows the 305 as lighter than the 298 and 285. That's surprising.
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      04-24-2023, 11:55 PM   #7
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Tons of information that I'm overwhelmed. I was thinking 305 30, but isn't that smaller diameter than front? Not sure if that will affect ride as people say 35 to 30 is noticeable.

Is 265 35 19 and 285 35 19 the safer bet/closer to stock tire diameter?

This is partially due to the 295 19 ps4s being narrower than the 285.

Last edited by notslow; 04-25-2023 at 01:30 AM..
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      04-25-2023, 02:26 AM   #8
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Quote:
Originally Posted by notslow View Post
Tons of information that I'm overwhelmed. I was thinking 305 30, but isn't that smaller diameter than front? Not sure if that will affect ride as people say 35 to 30 is noticeable.

Is 265 35 19 and 285 35 19 the safer bet/closer to stock tire diameter?

This is partially due to the 295 19 ps4s being narrower than the 285.
It's good that you're checking all the specs on tread widths. The combo you ultimately choose should be dictated by the tread width specs -- since these measurements vary from tire make/models.

A lot of people run 265/35/19 + 305/30/19. They come out to roughly the same overall diameter -- with the 305 being maybe 1mm smaller in diameter. It's really negligible. On the FIRs the 305/30 will be pinched a bit and therefore will look like it fills up the wheel well more than the 265/35.

I've run the 265/35/19 + 305/30/19 several times and have been happy with them -- albeit my wheel sizes were 19x9.5 and 19x11.

The current Apex wheels I have are 19x9.5 and 19x10.5 (same sizes as the FIRs) and I'm running 265/35/19 and 295/35/19 RT660. The RT660 are beefy wide.





Last edited by x.shell; 04-25-2023 at 02:32 AM..
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      04-26-2023, 03:07 PM   #9
notslow
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Thanks for the info everyone. I decided to go conservative and get 265/35-19 and 285/35-19. That should keep the diameter and width ratios the same as the factory setup. I would have gone 295, but the ps4s that size is narrower than the 285.
Didn't want 30 aspect ratio, main reason I didn't get 20" wheels.

Last edited by notslow; 04-27-2023 at 01:55 AM..
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      05-02-2023, 04:12 AM   #10
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For what its worth, I ran 265/35 and 305/30 R888R's with spacers F+R and never had TCS issues.
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      10-17-2023, 03:54 PM   #11
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Quote:
Originally Posted by s55jesus View Post
For what its worth, I ran 265/35 and 305/30 R888R's with spacers F+R and never had TCS issues.
Were you rubbing in the rear? I just put on some 305/30/19 on my FI-R and Im slightly rubbing on all dips on the road.
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      10-19-2023, 11:34 PM   #12
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Running 265/305 + 5mm spacer up front. No rub at all.
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      10-20-2023, 04:48 AM   #13
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Quote:
Originally Posted by jwkimura View Post
Were you rubbing in the rear? I just put on some 305/30/19 on my FI-R and Im slightly rubbing on all dips on the road.
No I didn’t but there’s a lot more that goes into whether the set up will rub or not. Tire brand/model (some tires run wider than others even if it’s the same size), suspension height settings, camber adjustment, etc.

I made sure mine didn’t rub even during full compression by adjusting those above factors.
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