20 replies to this topic

[Rallyeee]

Hi, just after peoples' experiences with fitting 245s to a gen 3. I'm aware it's possible to get these to fit but what I want to know is whether you need more than a couple of degrees camber to stop them scrubbing. I'm not going for some gay stance look, I want the wide tyres for grip so I don't want to be adding more camber than I would normally run to make the tyres clear as this will completely defeat the purpose of having wider tyres. The rims I will be using have a +45 offset, the guards will be rolled and the car will be sitting about 2 inches lower than stock. I don't want it to scrub under ANY circumstances, hard cornering, braking, track work, etc. If it will I'll just drop it down to 235s.

[Beckers]

Even 235's are a problem, a few of the guys have gone from a 235 to 225.

[Dav_fre]

I had 235's fitted by mistake, impossible amount of scrub under WOT and loaded corners, too much tyre flex and too wide

225

[SSIKness666]

THIS might help you.

[zahmad]

You're not the same Rallyee from NissanSilvia.com fame are you?

[Rallyeee]

Thanks guys. Would 235s be doable with mildly pumped guards?

 

Nope, I'm only on Subie forums.

[Beckers]

Why not use a 225 but buy a performance tyre, ie softer compound.

Tyre design & compound is more important than an extra 10mm of tyre width.

 

Just my 2 cents worth.

[RX25SE]

I don't get why you want wider tyres but wont add some camber?

You do understand the theory behind add more neg camber don't you?

Also, you have not told us the width or diameter of these +45 rims or the profile of the 245's.

Even a 235 of any size is a big tyre on a 2 inch lowered GenIII.

 

 

 

 

 

 

 

Why not use a 225 but buy a performance tyre, ie softer compound.

Tyre design & compound is more important than an extra 10mm of tyre width.

 

Just my 2 cents worth.

This!

 

[Rallyeee]

Because it will comfortably spin all four through 1st and 2nd, regardless of tyre quality. So I want to get the most traction I can without flares.

Yes I understand the theory behind camber, have been doing my own wheel alignments for years. I want to be able to adjust camber to be optimal for handling, not hellaflushness. It's not like it's a case of more is better, on the street I'll only run marginally more than stock camber to improve straight line grip and tyre wear.

Tyre width and offset are the only dimensions required to determine tyre clearance. Wheel width will only make a difference if sized incorrectly for hectic tyre stretch. Profile will be selected to match standard rolling diameter as closely as possible. So 40 or 45, haven't checked.

[RXJezza]

You will want a 245/35, 40 will be too big.

 

I have rolled and slightly pulled guards, with 18x8.5 +44 rims.

I'm confident they will fit in the front with minimal camber but the rear looks like it might need about -2 degrees.

 

In saying that my tyres are just below the guards so ill probably lift the car up another 10mm.

[Rallyeee]

Great, thanks. I'll probably use 235s, roll and pump the guards a bit and run around 1-2 degrees camber on the rear most of the time. If I end up with any spare room, which sounds doubtful, I'll be able to push the track out a little too.

[Rustyrobertson]

just giving an idea of what it may look like, i test fitted my 18x9.5 with 225x35 on my mates gen 3 and it was very very close and scrub city.

 

 

 

 

but im sure you wouldnt be running as stupidly big rims like these.

[Rallyeee]

What offset are they and are the guards rolled?


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[Rustyrobertson]

yea the guards are rolled, rear slightly pumped and they are +35 offset

[Grant]

I'll take a pic of my car if you want when I get a chance, running +48 with 225/40/18 tyres, widened track, 3mm spacers up front for brembo clearance and a bit of camber just for an idea of how much room you've got to play with

[Rallyeee]

yea the guards are rolled, rear slightly pumped and they are +35 offset

Ok, with 235s and a +45 offset, the tyre shoulder should sit 5mm further in. I'll be using 8" wide wheels which will bring the rest of the sidewall in a bit compared to that too. Sounds like it still might scrub when driving it like a dickhead though. I think I'll probably try 235s and hopefully I can get the guards pumped enough to make it work. If it's a fail, I may eventually do some more serious guard work and try to get some 255s under it. Then I'll start snapping shafts more frequently. Still half expecting the 6spd to let go after 7 years of abuse.

[Cam.]

I'm about to be running 18x8.5 +40 w/235 40 R18 (Front, Including 2mm wider track thanks to alloy control arms) and 18x8.5 +37 w/235 40 R18 (Rear, 3mm spacers fitted to near equal front track)

Front guards rolled flat, Rear guards rolled flat. 

BC V1's, 2 degrees of negative front camber and rear will most likely be natural camber depending on height. It won't be slammed, Just sitting on tyre.

I'll post pics in a few weeks.

[Scuba-Roo]

What alloy control arms are you running gc8 ones?

[Rustyrobertson]

Ok, with 235s and a +45 offset, the tyre shoulder should sit 5mm further in. I'll be using 8" wide wheels which will bring the rest of the sidewall in a bit compared to that too. Sounds like it still might scrub when driving it like a dickhead though. I think I'll probably try 235s and hopefully I can get the guards pumped enough to make it work. If it's a fail, I may eventually do some more serious guard work and try to get some 255s under it. Then I'll start snapping shafts more frequently. Still half expecting the 6spd to let go after 7 years of abuse.

the idea of 255's under a gen3 give me the warm and fuzzies

[Rallyeee]

Just an update on what I ended up doing for anyone in a similar boat. I rolled the guards out as much as I could then had a look at how much space I had and how much could be freed up with pumping. It really wasn't much so I went with 225 tyres. I ended up raising the ride height up to about an inch lower than stock too because I could still get scrubbing when driven violently. I really don't understand why anyone would fit similar width tyres and wheels with offsets any lower than +45. Even with guard pumping and camber pins, they're just a bump in the road away from locking up a wheel and spearing off into a pedestrian. They'll no doubt complain when the cops "pick on them" about their wheels though.

 

Turns out there wasn't much point going with wider tyres anyway since the driveshafts aren't strong enough to handle the grip, broke a front shaft on the third launch. Wider tyres will require guard flares and titanium shafts