stanjohn12

Ok I need advise on a very modest setup close to OEM spec. I do not want to lower my car or roll the insides of the fender , basically I do not want my wheels to rub at the same time want my ride to look a little better than OEM.

So I go to tirerack.com and choose the following tire size. Please advise if this will look ok and not create any problem for my ride or fenders.

2010 IS 300/250 OEM tires 225 / 45 / R17 front and 245 / 45 / R17 rear.

My question is ,on the same wheels can I mount 235 / 45 / R17 up front and 265 / 40 / R17 in the rear without doing any modifications or making it look odd ?

Is there any problem due the difference in AR between 45 and 40 from front and rear , will it look bad or spoil my ride quality ?

Toster24

19x9.5 +22 fronts and 19x11 +22

rears are rolled slight pull.

looking for alittle bit of a stretch suggestions on tire sizes?

350n350

18x9.5 +15 front, 18x10.5 +15 rear

would this spec fits IS350 dropped 1.25in on Tein S.Tech? Also what tire size I need to run?

Thanks

rawfish

iTrader: (1)

2007 AWD not lowered ( yet)
19x8.5 offset 35
19x9.5 offset 38

Will this fit?

2008GT500

Well, I've been wheel shopping, so I thought I'd share my research. I took the factory wheels and recommended spacer sizes to come up with "proper" offsets. Then as wheel width increased, I adjusted the offset to compensate. For a wheel 1/2" (12.7mm) wider wheel, you would need half of that for offset, so add 6.35 mm for every 1/2" you increase the wheel width. Sorry it won't format right, but below is a little chart I made. The idea is based on a 12-15mm spacer being the right size for the front, and a 18-20mm spacer being right for the rear. With that in mind, these are the wheel widths and their offsets that should fit with no problem. I think the rear could probably be 5mm less offset to be a little more aggressive, but I think this chart is fairly safe. The top line is the stock front and stock rear 18s. So reading from left to right, you get wheel width, offset for that width, 18" tire size, tire revs per mile, 19" tire size, tire revs per mile, and the rim width recommended for those size tires. This chart is for properly fitted tires. If you want the stretched look, you can be more aggressive on your offsets, just do the math with the different tire widths.

Width Offset 18" Tire RPM 19" Tire RPM Rim W

8 45 225/40/18
8 30-33 225/40/18 829 225/35/19 824 7.5-9
8.5 36-40 235/40/18 819 235/35/19 817 8-9.5
9 42-46 255/35/18 832 255/30/19 829 8.5-9.5
9.5 49-52 265/35/18 822 265/30/19 822 9.0-10


8.5 50 255/40/18
8.5 30-32 255/40/18 799 255/35/19 799 8.5-10
9 36-39 265/40/18 790 265/35/19 790 9-10.5
9.5 42-47 285/30/18 790 275/35/19 783 9.0-11
10 49-51 285/35/18 804 295/30/19 799 10.0-11
275/30/19 813

2008GT500

Rawfish, based off my chart, the front is 1mm too aggressive, and the rear is 4mm too aggressive. That said, I think I have a 5mm cushion in the rear, so you should be fine there. As for the front, I read in another post that someone on BC coils caught their fender with the 8.5 35mm offset 235/35/19, but they were very low. You'd probably be fine at stock height to a moderate drop, but the possibility is there. If you run a stretched tire, you'd have nothing to worry about. And if you do any fender rolling, you'd have nothing to worry about.

An2ny

Widest wheel/ tire set up front?
I would like to get 255 in a 9” wide wheel and +45 Offset Front and rear…anyone running something similar?

Thanks!

ShawnD

IS350 RWD looking at 18*9.5 +35 squared setup.

Stock height for now, but what issues do you guys foresee, if any, with either springs or coil overs?

RVCAis250

Which one you go with (springs or coils) is crucial. Another question is what tire sizes you will choose to go with.

stanjohn12

Why isn't anyone replying me ? Is my post invisible / hidden ?

An2ny

Do you have a RDW? Do you know how wide the wheels are?
If they are 8” wide I would not go with a 265, but it depends on the tire as some run wider than other and also on the tire side-wall.
Among other things you will sacrifice a bit of handling as the tire sidewalls flex more when transitioning from side to side.
About looks, I would not care but I know some people will, ride quality should be around the same…again it depends on the tire.

rawfish

iTrader: (1)

Thank you for taking time to reply. mine is AWD. Bought it as a daily but the oem wheels are trashed, so I thought id get something that looks better and fills the wells a bit more but I don't want to be aggressive and have issues with rubbing or have to roll cut fenders.

stanjohn12

Thanks for your reply. No I do not know how wide my wheels are they are just the stock 17 inch wheels that came with the car when new.

Yes my car is Rear wheel drive if that's what you're asking.

I thought all 17 inch rims were of same widths. Are they different ? If so I guess what I'm trying to do is risky because I'm getting the tires from US.

I just want the car to look a little better with slightly wider tires.

ShawnD

Thanks for the reply! I will probably go springs, unless I catch a good deal on some CO's.

I have 235/35 and 265/35 at home ready to go on whatever I wind up getting.

Thoughts?

An2ny

That is why I asked; I see that you are not in the USA so I do not know if the IS came with other size wheels there. I believe that the ones here with 17" are 8" front and rear? not sure.