Wider tires on sport rims?
 

As I wear my way through the stock rubber on my sport rims, I'm looking for my replacement tires. I've pretty much decided on the Ventus v12s. However I'd like to go wider on the tires, particularly the rear.

So, a couple questions:
1) How much wider can I go on the sport rims? Stock rear size is 275/35R19 and front 245/40R19. I don't want to push the limits or stretch/squeeze the tires.

2). How do I keep the rolling circumference the same? For example, if I can put 285s on the rear rims, do I still keep the 35 proportion?

Thanks in advance.

I think 285/35-19 on the rear is fine,same size as the NISMO 370Z..

Someones already put 305s on the stockers

I have 295's on a 10" rim and wouldn't go any wider personally.

Just checked Hankook's size chart and in 19" you could go 255/35 Front and 295/30 Rear which have the same overall diameter front and rear (26.0) but are a bit shorter than stock. Differences with the shorter tires would of course be ride height (car would sit about .3" lower) and a little quicker off the line, with a corresponding loss (marginal) at the top end. You would also gain a little understeer with a 40mm stagger (difference between front and rear), likely not a big deal anywhere outside of the track (especially considering the Nismo has a 40mm stagger stock). Sways would make a big difference here.

Closer to stock diameter you could go 255/40 Front and 285/35 Rear (don't see a 295/35 listed), which are close enough to each other in overall diameter (within .2") but just slightly taller than stock.

Personally I'd go with the 255/35, 295/30 option, especially if you plan to add sways.

I'm running the Hankook V12's 305/30/19 Rear 255/35/19 fronts. The rear tire has a slight squeeze, but not too bad IMO. A 295 would be more Ideal for a 10 rim. I'm planning on changing to 10.5 rim very soon, so thats was why I went with the 305.
Overall the car feels very good, great tire for the money. :tup:
I'm running the Eibach springs with 15mm frt & 20mm rear wheel spacers. No rubbing issues on the fenders what so ever. However since these tires are slightly smaller in height I have notice that my front wheel air diffusers and chin spoiler scrape more often on driveways and large bumps. I was hoping to go with coil overs and lessen the wheel gap by about 1/2 inch more, but now I'm re-thinking that. I would definitely have to remove the chin and wheel deflectors if I did that, I'm actually considering taking them off now.

Thanks for the advice guys. I've written down my specs for the V12s...going with 255/35 and 295/30s. Can't wait to burn through my stock rubber now so I can make the upgrade :)

Why would those tires benefit from sways? Would they compensate for understeer in a 40mm stagger setup? I'm rather new to some of these mod interactions.

Any pics?
(OT) I am about to pull the trigger on some wheel spacers 15mm fr & 25mm rr and remember your comment on another thread suggesting to consider the 20mm rr in the event I may want to oversize the rear tire upon replacement and rubbing issues.

(back on topic) My question (even though I know you went with 305's on the rear), do the oversize rear tires look out of place on the sport rim? I have seen in many cases with oversizing the tire on stock rims and they look like the Michelin man.

Here are some pics with the 305/30/19 rear and 20mm spacers and 1"inch drop. IMO: I don't think the tire bulge is all that bad, but Ideally I would prefer a 10.5 rim :-)
As far as 25mm spacers go, I personally wouldn't do it, unless you have some neg camber, as it stands with mine I dialed out the camber with some SPC adjustable arms, the 25mm spacers would probably make the tire stick out past the fender.

Looks good to me. I don't see too much bulge. Do you have a pic from the back so I can appreciate the super wide rubber?

You lads should read and understand this before messing with widths :tup:

Dunlop Tires | Care & Maintenance | Rim width and aspect ratio

Some of the pros here are better equiped to answer this, but from my research, aftermarket sways will typically reduce understeer and move the car back towards neutral. For example, I am about to add Stillens to my car, daily driver. The fronts are 29% stiffer than stock, and the rears, in their stiffest setting (which everyone here recommends, as well as Stillen) are 70%stiffer than stock. So you can see, this sway setup will dial oversteer back in, taking the car from factory understeer more to neutral. A 40 or 50mm stagger will add understeer, so if your sway setup has taken the car to neutral or slight oversteer, that much stagger will dial some oversteer out.

John

My other car was parked behind it, so I couldn't get one. We just installed the new Berk catback exhaust last night, so I will be taking pics of the back, as well as video of the new awesome sound! :tup: This car sounds like a baby Ferrari now!!

Definitely in for Berk CBE pics and vids :)

Wait...you have the final production Berk exhaust with the X pipe?

Not bad on the bulge for 305/30/19, I agree 10.5 rim would look better. Decisions…decisions…Do mean the 275’s would stick out with 25mm spacers or are you referring to 295 & 305’s? I am thinking more of stock tire 275’s width with the 25mm spacers and I will be dialing out the camber with SPC rear camber kit. Sry…for the constant Q’s.

Btw…congrats on the Berk CBE, can’t wait to hear the sound clip. Guess the Nismo CBE with Berk HFC just didn’t do it for ya? Hopefully you got a good price for the Nismo. I am stuck with mine for awhile. No $$.

There are not many choices available either in 295/19, there are a lot of 285/19s available ........ something to think about in your decision. I personally think 25mm is going to stick it out too far, but thats just my opinion. I have 15mm on mine, because I didn't do the fronts. Had I done the fronts, I would have probably gone 20mm in the rear. As it is, I think a 285, which is what I will go to when the stocks wear out, will still fill out the rear nicely. If more 295s come available by then, I may go that route as well.

Food for thought…..thanks Braden and John.

I did find these available tires under Tire Rack:

255/35/19
295/30/19 = 7 tires

245/40/19
285/35/19 = 9 tires

And stock size
245/40/19
275/35/19 = 19 tires

Not sure if I want the scraping going with the 255/35/19 fronts so I would prolly also stick with the 245/40/19 up front. For the rears it would then have to be the 285/35/19 if not the stock rear tire size of 275/35/19.

Curtis

what he said! /\ Sound clip now or :ban: :icon17:

Yes, it's the 1st production "TEST" unit with X-pipe. Everything seams to be good with it, I think now they will be available for sale and to ship out very shortly. I need to confirm with Bryan on the exact time, I don't want to let the cat out of the bag with out his consent. :tup:

Clip is being uploaded to youtube right now :tup: I will post it and start another thread with link, so this one can stay on topic. :tup:

Ok, here you go, as promised: :tup:
http://www.the370z.com/intake-exhaus...tml#post311153

Where I live the roads are not the best, and I am hesitant to go 35 series front and 30 rear....... I think I need 40 front and 35 rear to maintain sidewall height for rim protection and ride comfort, YMMV.

John

^I agree, just wondering if the 25mm will still look good on 275's or 285's. I may just have to be the first to try it on 275's and see how they look.

Sounds awesome. :tup:

any updates? sorry for the bump but im thinking of 15mm front 1" drop 25mm or 20mm? rear 1" drop on stock 19"s :tiphat:

I have not installed mine yet. Matter a fact I am ordering another size so I will mounting up ALL possible combinations.

15mm fr, 20mm rr
15mm fr, 25mm rr
20mm fr, 20mm rr
20mmfr, 25mm rr

Mine will not be installed until about the begining of March. I still keep buying new mods but not installing them.

Check out posts by RCZ he has pics of 15mm fr, 20mm rr.
Josh88 has pics of 20mm fr, 25mm rr
Mike has pics of 15mm fr, 25mm rr

No one yet has pics up on 20mm fr, 20mm rr. I still may be the first.

All of these pics are posted up on thread : http://www.the370z.com/wheels-tires/...20-rear-3.html

Starting on page 1

Hope this helps!

Curtis

good stuff and thanks for the info, post some pics when u can :tup: