Tire Sizing - STICKY TOPIC
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Author:  yummybacon [ Mon May 23, 2011 10:56 pm ]
Post subject:  Re:  Tire Sizing - STICKY TOPIC

Well i just figured something out it took me some time but here it is.My 195 60 15 i put on my 91 vert they rubbed really bad (yes they looked cool as hell) I knew once my wife and i were in the car it was going to be by by side walls.I just took the rims off of the vert and put them on my wifes 06 KIA Spectra they fit with room to spare i then took the Kia rims and put them on the vert. I was surprised to see they did not rub they are the same size tire so what the hell???.Here is are difference's the standard Kia rims are 15 inch.The Aluminums i took off of the vert are 15.7 this small difference made all the difference in the world they do not rub at all.You can run 15 inch tires but be cautious on the rim size.
I hope this helps

Author:  FlyingGrape [ Thu May 26, 2011 8:28 am ]
Post subject:  Re:  Tire Sizing - STICKY TOPIC

Sorry to say but I dont think that really helps, perhaps need to clarify some of your comments and numbers to make things a little clearer.

There is no need to focus on the diameter of the rim (15" according to what you wrote) but rather

1. The total diameter of the tyre mounted on the wheel - with a 195/60/15 this is probably around 24.2" in diameter (note not all tyres are identical in measurements despite using the same basic sizings).

2. The width of the tyre (in this case a 195)

3. The width and offset of the rim (or backspacing).

These three factors will determine where the wheel and tyre sit relative to the wheel well and the wall of the well. There are plenty of people who have run wide rims by playing with the tyre width, total diameter and offset.

I am not that familiar with the vert so will refer to the GT/GTi

for example a 13x7inch rim with +40 offset will probably comfortably work on a GTi with a 205/60/13 tyre while same tyre, rim width but offset of +10 will stick out further (by 30mm) and foul on the fender wall. This tyre package has around total diameter of 22.4", very similar to a 195/50/15 tyre and not that much larger than the standard 175/60/14 (at 22.3")- ie. minimal effect on speedo and wont affect other things like ride height etc.

As you can see from this your tyre has a much larger diameter (which will also affect the speedo reading by almost 9% assuming your standard tyre is a 175/60/14).

To better see the impact of the tyre sizing and rim offset I suggest you have a play around with the following calculators

hope that's useful and makes sense.

Author:  yummybacon [ Fri May 27, 2011 10:51 am ]
Post subject:  Re:  Tire Sizing - STICKY TOPIC

I’m not sure what is not clear. I had 195/60/15 with aftermarket rims the tires rubbed both inside and outside. I replaced them with my wife’s Kia tires 195/60/15 with stock steel rims and now i have NO rubbing inside or outside. I put the 2 tires side by side and the aftermarket rims are in fact wider than the steel stock rims off of the Kia. So because the aftermarket rims are wider they made the tires slightly wider but enough to rub inside and outside of my wheel wells.

Author:  bigdog6933 [ Mon Dec 09, 2013 9:07 pm ]
Post subject:  Re:  Tire Sizing - STICKY TOPIC

Just a fast question. I finally did the 15 inch rim upgrade. The rims I bought are 15 x 6 with a +40mm offset. The car is lowered 1.6 inches on Intrax Coils. Everything has been gutted from the car so now it only weighs 1600 pounds instead of 1780 pounds. Brand new Struts at all the corners also. So this is my question. Which tire size could I use to not rub, going to start autocross racing this car next year. The current tires on the rims are a 205/65 r15 and they rub worse than old man balls on old man thighs. :D

Im stuck between these sizes

195/45 r15
195/50 r15
205/50 r15

Author:  Dattman [ Mon Dec 09, 2013 9:24 pm ]
Post subject:  Re:  Tire Sizing - STICKY TOPIC

195/50/15 will be fine on those rims.

Author:  bigdog6933 [ Mon Dec 09, 2013 11:06 pm ]
Post subject:  Re:  Tire Sizing - STICKY TOPIC

Ok ty very much. I assume the 205/50 would rub since they are a bit taller and a bit wider.

Author:  95pontiacfirefly [ Wed Feb 18, 2015 2:57 pm ]
Post subject:  Re:  Tire Sizing - STICKY TOPIC

stock tire 22.6od
195/45/15 21.9od
195/50/15 22.7od
will the 195/50/15 rub after being lowered.

Author:  bigdog6933 [ Wed Feb 18, 2015 6:57 pm ]
Post subject:  Re:  Tire Sizing - STICKY TOPIC

that is what I ran on my car. it was lowered 1.6 inches and I didn't rub. not even over big bumps. but my car was also gutted so it did weigh less.

Author:  bigdog6933 [ Wed Feb 18, 2015 6:57 pm ]
Post subject:  Re:  Tire Sizing - STICKY TOPIC

I also had my inside front and rear fender lip rolled in.

Author:  95pontiacfirefly [ Thu Feb 19, 2015 7:46 am ]
Post subject:  Re:  Tire Sizing - STICKY TOPIC

my friend does bodywork hesgunna help me roll the lip if i have to

Author:  Rustyoid [ Sat Aug 05, 2017 2:12 pm ]
Post subject:  Re:  Tire Sizing - STICKY TOPIC

205/60R13 Fits great on a lowered car. Only rubs the front fender liner a tiny tiny bit at full lock. Fills up the wheel wells very nice.

13x6.0 +40 offset

Author:  Solerpower [ Sat Jan 27, 2018 1:14 pm ]
Post subject:  Re:  Tire Sizing - STICKY TOPIC

Figured I would add to this topic:

I'm running a 15" x6.5 with a 45 offset Volt Rays TE37 with BF Goodridge Super Sport Comp 2 195 50. These will not fit without spacers. I will be precise they technically would fit on the front, but will not fit on the rear on the inside edge. The front without any spacers will hit the inner plastic fender guard at full turn. I currently have 5 mm spacers on (all four corners) that are true hub-centric from 60.1 to 73.1. Even with these spacers I will get a occasional rub on the rear inside, but sit almost dead even with the outside edge of my 92 GT with no rub on the outside edges. I am running a modest drop also with H&R sport springs.

Things to point out:
6.5" is the width from bead seal to bead seal
The actual width of a wheel will vary from wheel to wheel;
Offset is usually a rounding of a real number, my 45 offset is really 43.6 mm
Backspacing can not be found by taking 1/2 the listed wheel width (6.5" in this case) adding or subtracting offset (adding positive offset).
You need to actually measure mounting flange to outer edge to get backspacing.
Scrub radius on 89 to 92 gt(i)s starts negative. I do not know what offset of the 175 14 were on the stock wheels, but I will caution that you will enjoy driving a wheel that has a 35 offset. Using the 5 mm spacers on this set up will bring the scrub radius back closer to stock and give a combined total offset of 40 verse a 45. Even with the 40 offset I am experiencing some wheel squirm when running straight. I had on 14 x 6 with a 35 offset before and enjoyed how those handle more with no wheel squirm. The total diameter difference is around 1%, and the weight total difference even with the spacers is less now than the 14s. I will be switching to 10 mm spacers and report back.


I'm use ARP 100-7708 12 mm x 1.5 wheel studs. These are cheap for an ARP wheel studs especially if compared to 12x1.25mm ARP studs. These will require a 1/2 drill bit and a drill press to fit them. They are 2.5" UHL with the correct knurl diameter and length.
The spacer are from Blox Sports from Ebay. They will make to order any spacers, and are extreme light not to mention true hub-centric for 60.1 to 73.1.

Author:  Flipper [ Sat Feb 17, 2018 7:59 am ]
Post subject:  Re:  Tire Sizing - STICKY TOPIC

I’ve been running 205/40/17’s for about a year now. They’re 35 offset and 7.5 wide. Very tight fit. “A bit”of modification was required. Lol. Drives great but a bit rough. H&r coils and front struts are modified a bit to drop it another 6mm. Significant drop in body roll. No shakes at any speed but I’m running cooper all seasons performance tires which weren’t cheap. No difference in acceleration going from 15’s to 17’s that I noticed.


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