Question: Integra running 225/45/15 on +40 offset 7.5in wide rim
 

Hey guys,

I got rota 15x7.5 +40 rims, and looking to use Nitto NT-01 225/45/15. What trouble will I need to go through to run them on the road course?

I will have to remove the front fender liners right?

Thanks in advance.

Re: Question: Integra running 225/45/15 on +40 offset 7.5in wide rim
 

Fender liners for sure. Maybe spacers (probably, and definitely in the rear), and maybe some fender rolling. What chassis?

Edit: I know search is down, but this link is available as still current within the RR/AX subforum:
https://honda-tech.com/forums/road-racing-autocross-time-attack-19/225-50-15-hoosier-questions-2495853/

And this one would've been harder to find, but has a little bit of useful information for you:
https://honda-tech.com/forums/road-racing-autocross-time-attack-19/15x7-15x7-5-15x8-2469948/

With no search at all, this place is basically worthless.

Re: Question: Integra running 225/45/15 on +40 offset 7.5in wide rim
 

2000 integra gsr

Re: Question: Integra running 225/45/15 on +40 offset 7.5in wide rim
 

search was up on and off. i saw those 2 posts before, but there is more info that i like now. ^__^

I hope scott bell's experiences is with integras! I really don't want to put spacers, since i am trying to make april vir, and i still need to pull the motor to do some work.

spacer = extended studs = new bearings. I am crossing my fingers.

thanks!

Re: Question: Integra running 225/45/15 on +40 offset 7.5in wide rim
 

I was talking about an Integra. 98 Type-R to be exact. All the wheels and offsets I was talking about are 15x7.

With 7.5 wheels you are talking about an additional 12 mm of width. Take 1/2 of that, subtract the offset difference, and the inside of your wheel is 3mm closer to the suspension than mine.

However, you are talking about a different tire. Hoosiers are basicly a cantilever (technincly not, but that's the best word I have to describe them) tire and are designed to "bulge" past the edge of the rim. My statement was that a 225/45 Hoosier on a 15x7 +43 wheel just barely cleared the rear trailing arm.

Your case may be different. Do you have the wheels? Bolt one on without a tire and you will see how much room you have. My gut reaction is that it probably will clear, but you don't know how much sidewall buldge you will have untill you get the tire on the wheel.

edit: worse case you will have to run a very thin spacer on the back.

Re: Question: Integra running 225/45/15 on +40 offset 7.5in wide rim
 

Hi scott. thanks for the reply. do you track your car? in theory, high speed braking will cause toe in, so I am not sure how much clearance is really required for track car vs street cars. my integra is a track car, it doesn't see the street.

thanks

Re: Question: Integra running 225/45/15 on +40 offset 7.5in wide rim
 

Why would toe in change space with respect to the trailing arm?

And Scott, I don't know how you made that work. I've seen other ITRs with +38 15x7s and 225/45 Toyos rub there, and I know the Hoosier is a little wider.

Re: Question: Integra running 225/45/15 on +40 offset 7.5in wide rim
 

wenlyone,

You have to visualize what parts move together with toe changes. The wheel and hub are all bolted together. The tire can not change its relationship to the trailing arm.

Stinky,

+38 15 x 7 rubs there? I just do not see how that low of an offset could contact the T.A. Granted, I have a nice polished spot on the TA. I probably have .0000001 in clearance. It works, but just barely. The HoHo's have a pretty vertical side wall. Its been a while since I have used Toyos but I seem to remember a pretty good sidewall bulge. We are only talking 5 mm so I guess its possible.

Personally I am willing to accept very slight contatct to run the offset as close to stock as possible, but it does work. The offset numbers I'm talking about are accurate based on what is on the wheel and what I have personally measured.

Re: Question: Integra running 225/45/15 on +40 offset 7.5in wide rim
 

Yep, on at least two cars. It produces the polished spot you're talking about, so it's sort of workable.

Curious, can you explain your logic on maintaining stock offset?

Re: Question: Integra running 225/45/15 on +40 offset 7.5in wide rim
 

Logic....

Reading a lot of Carrol Smith books convinced me that wheel offset has an effect on suspenson geometry. I am sure that the closer I leave things to stock and the thousands of engeneering hours spent on the design the better off I am. I'd have to pull out the books to explain it in technical terms.

This is going to sound cocky, but I have a lot of track time with a lot of cars. I've learned while I may not have F1 talent, I do have a God given talent to drive a car at the limit. Getting very far off the stock offset makes almost all cars feel, well, not right. Like the car wants to trip over its self. I've run this car with the same tires on a +35 wheel and this +43 wheel, and I can tell the difference.

It's not a big difference and if I had to run a lower offset to fit a bigger tire under the car I would, because the larger tire is going to be faster. However I'm a big believer in keeping things as close to stock as possible.

Re: Question: Integra running 225/45/15 on +40 offset 7.5in wide rim
 

I've heard similar arguments. My follow-up question to you is this: while there were hundreds (thousands?) of hours put into the design of something like the ITR suspension geometry, was it not largely based off the Integra design, which was in turn based off the Civic design, which was intended to be only an economy car and never a race car?

I don't doubt your credentials or ability at all, just looking for a good answer to that question. It's been in my brain for a few years now. I have many more thoughts on the matter, but I'm OT enough as it is :)

Re: Question: Integra running 225/45/15 on +40 offset 7.5in wide rim
 

I am a suspension dummy. : ) I just read that from searching h-t, and I am guessing that toe in makes it rub more is bs. ^__^

on that note. I was calculating from this thread

https://honda-tech.com/forums/wheel-tire-56/4x100-15x7-5-15x8-wheel-options-2429965/

with 15x7.5 +40 on 225/45/15, I should clear.

does itr have a different size rear/trailing arm?

Re: Question: Integra running 225/45/15 on +40 offset 7.5in wide rim
 

So he is running 15x8 +36

I was doing some math, since I am running

15x7.5 +40 and I am looking to run 225/45/15.

his: 8in = 203.199mm; divid by 2 = 101.599mm
mine: 7.5in = 190.499mm; divid by 2 = 95.249mm

our offset difference 40mm - 36mm = 4mm

our rim inside difference 101.599mm - 95.249mm = 6.35mm

6.35mm - 4mm = 2.35mm

So I should have 2.35mm more clearance to the inside right?

I am not sure if I am doing the math right. He has a gsr like me.

Re: Question: Integra running 225/45/15 on +40 offset 7.5in wide rim
 

no problems.. just run it ! i dont c y everyone trips out on wide tires?

Re: Question: Integra running 225/45/15 on +40 offset 7.5in wide rim
 

Your math looks correct Wenly.

Red90, how can you say that after Edo went so far as to run 235s or whatever? :P ;)

Re: Question: Integra running 225/45/15 on +40 offset 7.5in wide rim
 

Hi!

Well, I def want to run 225's. But since I don't have much time to get my car ready before going to vir in april, I rather not deal with extended studs due to needing spacers. that is all. ^__^

I think I am getting closer to getting 225's instead of staying with 205 :)

If my caculations are correct that is.

I really hope itr have a beefier rear, that is why these track guys are rubbing.

*crossing my fingers*

Re: Question: Integra running 225/45/15 on +40 offset 7.5in wide rim
 

thanks Stinky!

so I am assuming ITR has a more tighter rear? since with scott's calculation, itr will def be rubbing with my wheel/tire setup. But then I have a gsr, so I hope gsr has a skinner trailing arm or somethng. lol

Re: Question: Integra running 225/45/15 on +40 offset 7.5in wide rim
 

Wenly, are your fenders rolled?

Edit:
I don't think the GSR and ITR have different trailing arms... Worst case scenario, get a pair of 2-3mm spacers, you can safely run those without extended studs and so on.

Re: Question: Integra running 225/45/15 on +40 offset 7.5in wide rim
 

I will be rolling them all. that isn't a big deal vs needing spacers + extended studs. ^___^

the fronts though. do you guys try to keep the liner?

Re: Question: Integra running 225/45/15 on +40 offset 7.5in wide rim
 

Use the power of the Google.

[search terms] site:honda-tech.com

Re: Question: Integra running 225/45/15 on +40 offset 7.5in wide rim
 

You're ****ing kidding me. That is absolutely infuriating that an outside site searches THIS site better than the goddamn search program WITHIN THIS SITE.

Re: Question: Integra running 225/45/15 on +40 offset 7.5in wide rim
 

The only decent answer I can come up with it this:

This suspension design dates back to a time when Honda was widely considered to have over-built their cars. Honda was never the cheapest economy car, but it sure was one of the best. To have a comfortable riding car you need soft springs and a lot of suspension travel. If you want the car to also handle well with a lot of suspenison travel you need to minimize the camber and toe change as the wheel moves in its range of travel. Hence you come up with the double a arm design, which also has the advantage of small packaging. This allows a sloping front end and lower aero drag which is good for economy.

There definately are problems. You can't cram more that about a 23 inch diameter tire under the thing. You can't lower it very much and still work right. Try slamming your Teg 3 inches and see how it works. (it doesn't)

The suspension on the cars is just a well desigend setup that was first intended as a great economy car. Just so happens that when we stiffen it up it works great on track as long as you don't mess it up by going too low or screwing the geometry some other way.

I never fail to get a kick out of moving the suspension through its range when I have the shock off the car and seeing the hub move straight up and down with no apparant toe or camber change. Try that on a strut car and see what happens.

Re: Question: Integra running 225/45/15 on +40 offset 7.5in wide rim
 

FYI - I have run 225/45/15 Hoosiers on my ITR with 15x7 +45mm offset Team Dynamics wheels. Front fender liners had to be removed and front and rear fenders rolled. The fronts fit fine with very little rubbing (car is lowered about 1.25" with -2.7 front and -2.0 rear camber). The rears must use extended studs and a thick 5/16" spacer to reduce, but not eliminate, rubbing on rear trailing arm. When running 225/50/15's, no spacers are needed in the rear.

I also chose 45 mm offset wheels to keep front scrub radius similar to the ITR's OEM settings for optimum steering feel and feedback. Unlike most other track wheels, Team Dynamics wheels are available in multiple offsets, so you can choose what you want. Stock ITR rims are narrower and 50 mm offset. With 7" wheels, the 45 mm offset was the most that I could run without tire rubbing on front knuckle. There is some rubbing at maximum lock and load at a few points inside the front wheel well, but it has never been a problem. I have always found that you get a lot more rubbing at full tilt on track than you might think due to tire deformation under load.

When things start to smoke, you need to add clearance!

Re: Question: Integra running 225/45/15 on +40 offset 7.5in wide rim
 

thanks for the recommendation.

does anyone know if itr rear is different than gsr rear?

Re: Question: Integra running 225/45/15 on +40 offset 7.5in wide rim
 

:)