Max Tyre Width For R32 Gtr Without Rolling The Guards?

[Moodles2]

I know you can only fit 225's are the biggest you can fit on the stock R32 GTR rims, I was thinking about getting a set of R34 GTR wheels to use at the track, and I'm pretty sure they can fit 245's onto those rims. Is 245 the widest I can get on my R32 GTR without the rolling the guards, or can I go wider than 245 (with a different rim choice obviously)?

[nisskid]

u could go 245's on R32 GTR rims if u wanted, although i probably wouldnt reccomend it for circuit. but it depends on the tyres, if ur running semis with really hard sidewalls u can run 235's comfortably at the track without too much sidewall flex.

for a R32 GTR id be trying for a 17x10 +30 with a 255/40 at the rear, and a 17x9 +25 with a 235/45 at the front.

[Moodles2]

Wouldn't the 2 different tyre widths front and back not be good for the ATTESSA system?

[nisskid]

Wouldn't the 2 different tyre widths front and back not be good for the ATTESSA system?

its fine, they are the same (well similar) rolling diametre. tyre width is not an issue for atessa, its only rolling diametre.

[Moodles2]

u could go 245's on R32 GTR rims if u wanted, although i probably wouldnt reccomend it for circuit. but it depends on the tyres, if ur running semis with really hard sidewalls u can run 235's comfortably at the track without too much sidewall flex.

for a R32 GTR id be trying for a 17x10 +30 with a 255/40 at the rear, and a 17x9 +25 with a 235/45 at the front.

Can the front go any wider, or is 235 the most you can do without rolling the guards, and is the same true for 255 at the rear?

[nisskid]

i reckon u could go a 245, maybe even a 255, ur main limit is the upper control arm at the front.

but really, ur best option is to just get ur guards rolled, why dont u wanna roll ur guards?

[MrStabby]

Most ppl with GTRs go with same size all round as they are front heavy and understeer, so except for cosmetic reasons its not worth going fatter at the back. ~255s are often ok without rolling but different makes of 255s have different tread widths, which might be surprising to you. For Falken 615s in 255 i rolled the rears, but other 255s are ok without it.

[SSHatch]

Mine runs 245/40 all round on a 17x9 +20 BBS Wheels. Even with the coils overs wound right down there was no rubbing whatsoever and I have completely stock untouched guards. Heaps of clearance to the upper arms in the front as well.

[Moodles2]

i reckon u could go a 245, maybe even a 255, ur main limit is the upper control arm at the front.

but really, ur best option is to just get ur guards rolled, why dont u wanna roll ur guards?

I'm not that into getting my guards rolled, mainly I want to keep the stock thing going, I think 245's all around will suit me. Is 245 the limit with R34 GTR rims destined for track use?

[bnr#@]

Dont trust anyone who tells you to run different size wheels front to rear on a GTR, if nothing else its just stupid, and +30 offset???

For reference I run BBS LM 17X9 +20 and they are prety much spot on. Tires are RE55S in 255 40 r17 and they are perfect,

[Risking]

with the right offset rim you WILL for a 295 on the rear and a 265 on the front.

We use Supra offset rims 18 by 10 front and 18 by 11 rear with above tires. We space the rims accordingly to get them on.

Also have run a 320 rear slick with a 300 front slick but required some neg camber and slight inner guard modifications

[R324DR]

with a +30 offset such as the R34 gtr rims, 255 or 265 35 will be fine without rolling guards. Personally i think +30 offset in a 9 inch rim looks a bit odd on a gtr as they sit to deep within the guards. At minimum an R32 GTR should have at least +22 offset to fill out the fat guards (imho). I have 18x9.5 +15 offset rims with 255 35 tyres and required a small amount of guard rolling as it was rubbing ever so slightly.

[nisskid]

Dont trust anyone who tells you to run different size wheels front to rear on a GTR, if nothing else its just stupid, and +30 offset???

For reference I run BBS LM 17X9 +20 and they are prety much spot on. Tires are RE55S in 255 40 r17 and they are perfect,

firstly, he asked about max tyre width, personally i wouldnt run it or reccomend it, but im answering his question. there isnt as much room up the front due to the shit amount of inner clearance, so ultimately the front will never be able to fit as much tyre underneath.

2ndly, +30 offset at the rear is to push up as close to the rear tie rod, in case u didnt realise, a 17x10 +30 will stick out further than ur 17x9 +20, it will also stick in further, giving u more room for a larger tyre. a 17x9 +20 is not utilising a lot of room inside the guard, in fact theres about 20mm worth of unused space there.

[nisskid]

I'm not that into getting my guards rolled, mainly I want to keep the stock thing going, I think 245's all around will suit me. Is 245 the limit with R34 GTR rims destined for track use?

u would never know a rolled gaurd from the outside. u do realise to roll a guard all they do is push the inner lip up right? its not any modification to the outside of the guard.

[nisskid]

btw, it also depends on ur suspension, a lot of u guys might be running high enough that ur not really finding out the clearance of ur guards as ur tyres arent really going far up into the guards. i ran 235/45's on 17x9 +16 on standard gts-t guards and they were mexican as f**k (sat out of the guards) and yet they never scraped because my front suspension never compressed enough to.

[Beer Baron]

i'm sorry but that was poor advice. you need as much front tyre as you can get on a GTR. and a 235/45 is not the same as 255/40. one has a sidewall height of 102mm one is 106mm. it might not affect attessa, but then again it might. it's not worth the risk, and again you are just wasting front grip by running smaller tyres on the front. you can easily fit 255s on the front.

what the absolute max is I don't know. you could get custom offset wheels to maximise every mm of available clearance both inner and outer but bear in mind every car is different. castor setting, camber setting, height setting, wheel offset and even tyre brand and model (all are slightly different) will have a bearing on what size you can fit. so there is no real hard rule. what will easily fit on one GTR will rub on another.

to be safe you can comfortable run 255s on your R34 rims and they are a good size for that wheel. I would go either 245s or 255s. if it's for track use and you are using semi slicks a 235 or 245 will be a good fit (semi slicks tend to be wider in any given size than road tyres. a 235 semi slick will be about as wide as most 255 road tyres).

[djr81]

Well said Baron. Also if you want a track wheel/tyre package there are MUCH cheaper ways to go about it than using R34 rims.

Try a 255/40/17 on a 17*9 rim. It will be $500 cheaper for the R comp tyres alone. Just be aware a RE55 in that size will scrape on the rear with a +22 offset. You may get away with it with more offset eg an R33 Gtr rim but trackwidth is not something you should just give away if you can at all help it.

Something to think about, anyway.

[nisskid]

i'm sorry but that was poor advice. you need as much front tyre as you can get on a GTR. and a 235/45 is not the same as 255/40. one has a sidewall height of 102mm one is 106mm. it might not affect attessa, but then again it might. it's not worth the risk

lol, are u serious? that kind of difference ull see on most GTR's running same size tyres anyway, whether its weight distribution (more load on front tyres, causing more compression), tyre pressure (not only cold, but heat differences will cause different pressures) and more important wear difference, ur typical road tyre has a average legal wear life of around 7mm, that means overall ur tyre will change rolling diametre by 14mm from new to worn. believe me when i tell u ur GTR wont explode over 4mm rolling diameter difference.

btw, anyone remember a certain GTR, called something like the R35 i think? check the tyre specs front to rear on that.

what the absolute max is I don't know. you could get custom offset wheels to maximise every mm of available clearance both inner and outer but bear in mind every car is different. castor setting, camber setting, height setting, wheel offset and even tyre brand and model (all are slightly different) will have a bearing on what size you can fit. so there is no real hard rule. what will easily fit on one GTR will rub on another.

agreed, i was probably being a little on the cautious side when it came to how much u can fit under the front guards, my head wasnt really in the right place, i was mainly thinking about the best wheel size/offset and why the hell he doesnt just roll his guards tbh.

[djr81]

lol, are u serious? that kind of difference ull see on most GTR's running same size tyres anyway, whether its weight distribution (more load on front tyres, causing more compression), tyre pressure (not only cold, but heat differences will cause different pressures) and more important wear difference, ur typical road tyre has a average legal wear life of around 7mm, that means overall ur tyre will change rolling diametre by 14mm from new to worn. believe me when i tell u ur GTR wont explode over 4mm rolling diameter difference.

It isn't so much the rolling diameter as the fact that if you put a smaller tyre on the front your R32/33/34 will understeer like a pig on the track. Worse than it usually does in fact.

With regard to tyre wear the fronts wear quicker than the rears. Which tells you all you need to know about weight distribution.

[Beer Baron]

yes I am serious. I don't need to "check the specs" on the R35, I've owned 1 and imported 3 of them. and driven many. yes they run different tyres front to rear. it's also a completely different car with a completely different AWD system and is designed to run with those sizes from the factory. R32, 33 and 34 are not designed to run different sized tyres from the factory.

i never suggested a GTR would explode by running different sized tyres. I just suggested that it was a dumb idea. and it is. you only have to look at the number of people with awd problems in their GTRs after fitting different sized tyres to know it's a problem. and again why would you do it? tell me what is the benefit of running smaller front tyres? I would have thought less front grip was a bad idea not a good one.... unless you like sliding wide at every apex on the track.

to re-cap. the benefits of running the same sized tyres front to rear on a GTR:

you get more front grip for better handling balance

you can choose from the wide range of GTR suitable offset and size wheels (which are all in pairs of 4 the same size)

you will have trouble free AWD operation

you can rotate tyres front to back (important as the fronts will wear faster, you get a fair bit more lift by doing this)

running different sizes:

will be hard to find GTR suitable offset and size wheels

less front grip will give you plenty of understeer

the now smaller front tyres will have to work even harder as there is less of them and will wear even quicker than they normally would

you can't rotate them front to rear anymore which means less tyre life

you may have AWD problems (the fact that they will wear even quicker than usual often means you may not have problems when they are fitted new, but as the size gap between front and rear grows with wear you will run into problems as the wheel speed sensors detect what appears to be front wheel spin ALL THE TIME)

your GTR will look silly with it's small front tyres.