I am going to ask a specific question, yes I have searched, please dont reply if all you are going to tell me to do is search.

My Z has the 5spoke touring wheels as well as height adjustable coilovers.
I am currently running 225/45/18 in the front, and 245/48/18 in the rear.
I would like to run tires with a smaller sidewall for aesthetic purposes.

A friend of mine suggested 235/40 F, and 255/40 rear.

I would like to know your suggestions for tire size, rubbing should not be an issue because I will be adjusting the height accordingly and subsequently getting an alignment done shortly after the tires are purchased.

I would like to know your recommended tire size to achieve what I am looking for.

But first, something I would like to note is that my rear tires have a lot of inside wear and my front tires have a small amount of excess wear on the inside but generally wear a lot more evenly than the fronts do (camber is as close to spec as possible with the drop), but In your suggestions if you could take into account and maybe even explain to me if the suggested size tires will cause more or less inside wear or if it is all negligible.

Also as a side note with the 18x8, and 18x8.5 touring wheels is a staggered setup a necessity?

Thank you for reading my novel and I appreciate your input!

 

You don't need to run staggered even though they are 8/8.5. I like the 245/40x4 set-up. Alternatively, you could run 245/40 front and 255/40 rear.

 

As Scott points out, the wheels don't have to be different sized, but it's commonly done for appearance sake and to maximize tire size (i.e. the biggest that fits). Normally when we refer to "stagger" we're talking about the difference in front and rear tire OD. That's what keeps TCS/VDC happy and safe.

 

general rule of thub is the rears ,must remain taller than fronts.... if you have a car w VDC. If not, youd still want them squared at a maximum, ie the same size fr and rr, never a bigger tire in front tho etc.
Also, the rear tire wear is due to toe, not camber. Get toe delete bolts if you run an OEM style coilover.

www.1010tires.com has a wheel and tire size calulator that will help you compare what you think you want with factory sizes.

 

wish we had specs of wheels/tires being run on a spreadsheet showing
fender gap, rolling, or camber required

 

Yeah, with VDC not the best idea to run same size all around, or even the wrong diameters for that matter. There are threads out there with guys doing that with VDC issues. The sizes you metioned seem a tad shorter than normal also.

 

I know the first # is width of the tire but if you wanted to run a smaller side wall wouldn't you just go with a less wide tire i.e. 215 front and 235 rear....wouldn't that in effect "stretch" the tire with less sidewall??

 

Yes you can run a 255 mm tire on a 8.5 inch wheel. Add the numbers here are see what you get: http://www.dakota-truck.net/TIRECALC/tirecalc.html

 

If you like the thinner side walls, that (in RED) would work very well, since it maintains the relative diam difference F/R as stock and would not trigger the VDC. Those would normally have more wheel gap, but you can lower with coil overs.

 

didn't want to start a new thread, so here is my situation.

i'm currently running
Front: 19 x 9.5, 255/35/19
Rear : 19 x 10.5, 275/35/19

both looks a bit stretched.

looking at buying a different brand of tires, i found the same size for the rears, but the fronts is only available in 245/35/19 and 245/40/19..

i went on a website that offers tire size calculator and i did a comparison between the two fronts..

255/35/19 (Current)
Rolling Radius: 207.69cm
Total Diameter: 66.11cm
Sidewall Height: 8.92cm


245/35/19
Rolling Radius: 205.49cm
Total Diameter: 65.41cm
Sidewall Height: 8.57cm


245/40/19
Rolling Radius: 213.19cm
Total Diameter: 67.86cm
Sidewall Height: 9.80cm

IMO, 245/40 would be less stretched than the current one, but taller sidewall... the 245/35 will be a bit more stretched than the current one with almost the same sidewall height.

So, what's recommended??? 245/35 or 245/40 ?

thanks

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