I currently have this tire set up on my TEs (19x9.5 +22 all corners)
245/35-19 fr
265/30-19 re

My VDC is going nuts (even though the difference is only 1.95%) , so I'm looking for new tires for the rear. I don't want to replace all four because this tires are pretty good conditions and I need to save as much $ as possible for some other reasons.

I was doing a lot of reading about which tire should I get on the rear. Most people are running 275/35-19. Well if I run that tire with my 245/35-19, it is 3.1% taller, going over the 3% rule, even more with a 285/35-19. If I run the same tire with the 265/30-19 up front, the difference is 5%. The only way it looks like it will work is, if I use the 245/35-19 with a 285/30-19 and that be the same diameter all around. With a 265/30-19 and 285/30-19 the difference is only 1.9%. Am I doing something wrong with the tire calculator?
http://www.wheelsmaster.com/rt_specs.jsp

So should I use 285/30-19? If so with the 245 or 265?

thanks

 

VDC is going nuts as it should be. Front tires are 25.8" diam, rears are 25.3" diam. A violation of VDC rule #1.


If you have 245/35 up front, you need a 275/35 or 285/35 out back.

I'm running 255/35 & 285/35 and have no VDC issues.

 

a 35 series in the rear still put me over the 3% rule

 

I'm not 100% convinced of the 3% rule just as I'm not that confident in the other un-official rule of making the rear 0.25 to 0.75" taller than the front. The basic problem is that Nissan has nothing officially published so nobody really knows what the upper limit is. For sure, the lower limit is that the fronts can't be taller than the rears (-%).

As I stated before, I'm running 255/285 which is about 3.5% and have had no problems. There are guys running even bigger rears (295, 305, etc. with 30 & 35 profiles) and have no VDC issues to speak of. I've got a local guy running 255/35 & 295/30 which are essentially the same diameter and he has no VDC issues.

The trick is to find front and rear diameters that stay pretty close to the stock diameters so that 1) you keep the stagger and 2) you keep speedometer reading fairly close. So don't focus on the height/ratio as much as the overall diameter. The stock 18" were 25.9/26.7" diameter.

You can always go with the old standard of 245/35 and 275/35. That gives you 25.8"/26.6" which are close to OEM diameter. My 255/285 combo is 26"/26.9" by comparison.

BTW - I have a set of autocross wheels/tires that are 265/35 on all four corners. I have no problems with VDC during normal street driving. Apparently VDC is pretty forgiving.

 

That makes more sense than the 3% rule. I think I was doing the calculations wrong also. Considering my rim size, I think I should stick with 275/35 on all corners though.

 

Yes, looking back at your first post, the 9½" wheels do limit the size of the rear tires. Stick to the 275/35 and you'll be fine.

 

all around?

 

Nope, 245/35 in front, 275/35 in rear. I assumed all along you were keeping the front tires.

 

i have toyo t1-s rears for sale. they are 275-35-19. there is about 40-50% tread left. asking 150 for both if your interested. i started a thread in the classifieds. pm if interested

 

you assumed right. I will like to have the same size all around eventually, just not right now. thanks


it is tempting but I would like to keep the same brand of tire all around. Right now I have Dunlops SP 9000

 

actually it might be cheaper to buy this 2 and 2 new ones than buy 2 Dunlop SP9000 in the same size. you have PM

 

so in your opinion you think its possible to run square with no TCS VDC issues?

how is the speedo affected?

 

Has anyone ever ran a 275/30 up front and a 275/35 in the rear? I wonder how this would work?

 

Apparently it works in a lot of cases. From what I've seen over the years is that some cars are more sensitive than others. I normally autocross with VDC turned off anyway, but driving to and from the events I leave it on. I had always planned that I would need to keep it off even on the street so this is just an added bonus.

My speedo is WAY off. The 265/35 is 25.4" diam (852 rev/mile) whereas the stock 245/40 was 26.7" diam (780 rev/mile). The smaller diam allows the wheels to spin up quicker and I reach the rev limiter at a lower speed. It's kinda like installing a different rear end gear.

 

It should work since the rear will be taller than the fronts.

 

If a car has TCS only is it as sensitive to tire sizes? or is it VDC only?

 

It's mainly a problem with VDC cars. In theory it can occur on a car with just TCS, but I can't recall anybody ever reporting "Slip" warnings after changing out tires on a TCS only Z.