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Old 02-22-2015, 02:43 AM   #1
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Changing tire size in the back...

I am running 235/50/18" all around.
I want to run a lil bigger in the back so I can stop spinning the rears with my new MPT 93/Perf/Race tune.

Would 245/45/18" keep the height as my 235/50/18s?
My rims are Motegi 18x8 MR118's... so I know you can't go too wide.

Thank You, very much!!
-Allan
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Old 02-22-2015, 04:32 AM   #2
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This is a very useful sight I came across...
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255/40-R19 vs 285/35-R19 Tire Comparison - Tire Size Calculator
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Old 02-22-2015, 10:21 AM   #3
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Are you worried about your speedo? You would be making a minor change in height and wouldn't affect it much at all.
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Old 02-22-2015, 12:30 PM   #4
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if you decide on going with a wider tire I would recommend going to a 255/45-18 it would be closer to your stock 235/50-18 and still fits the 8" rim
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Old 02-22-2015, 02:54 PM   #5
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Does the wider tire affect anything besides the speedo?
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Old 02-22-2015, 02:57 PM   #6
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Does the wider tire affect anything besides the speedo?

Width doesn't affect the speedometer. The overall diameter of the tire is what affects the speedo. If you look for a wider tire that has the same overall diameter as your stock tire, the speedo should be fine.


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Old 02-22-2015, 02:57 PM   #7
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Does the wider tire affect anything besides the speedo?
Technically a wider tire doesn't affect the speedo. But since the sidewall is a % of the width it'll coincide together... A wider tire is mainly going to add friction, so actually at very high speeds there will be more drag on a car because of the extra friction on the road, so when picking tires wider isn't always better, you want to find one that is wide enough but not too wide to be un neccesary.

If you are talking about it affecting other parts of the car, no it doesn't really throw anything else off.
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Old 02-22-2015, 02:58 PM   #8
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Wider won't affect anything. It's the overall tire height.

And you wouldn't be able to rotate tires after that kind of change.


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Old 02-22-2015, 03:05 PM   #9
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Sweet. Thanks for the info!
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Old 02-27-2015, 08:13 AM   #10
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thx guys. Going' with the 225/45/18..its only a 0.08% difference ...As long as its not over 3% difference you are ok.
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Old 02-27-2015, 08:46 AM   #11
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Quote:
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...And you wouldn't be able to rotate tires after that kind of change.
Unless you get directional tires, you can still rotate left to right.
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Old 02-27-2015, 09:37 AM   #12
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Unless you get directional tires, you can still rotate left to right.
Yeah ..just realized that yesterday. Cooper RS3-As.
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Old 02-27-2015, 07:12 PM   #13
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thx guys. Going' with the 225/45/18..its only a 0.08% difference ...As long as its not over 3% difference you are ok.
You're tired of spinning gears with your new found power and the solution is to go to a narrower and shorter rear tire........both reducing your contact patch and giving that power more leverage? Not really a solution. The 255/45-18 recommendation above is a good one.
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Old 02-27-2015, 11:21 PM   #14
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I heard from quite a lot of people say ...more tire patch, the less spinning of your tires. Hooking up will occur more.
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Old 02-28-2015, 08:26 AM   #15
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I run Cooper Zeon RS3-A in size 255/45-18, still can't hook up. I've 'learned' to just live with it
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Old 02-28-2015, 09:04 AM   #16
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Thanks A Lot!
Oh boy.
....not going to have have that extra tire weight and tire expense then. Savings all around except that staggered look.
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Old 02-28-2015, 06:42 PM   #17
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I couldn't hook up with my stock 255s, 3.31s, and stock tune. My 275s hook up way better though.
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Old 02-28-2015, 06:56 PM   #18
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Quote:
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I couldn't hook up with my stock 255s, 3.31s, and stock tune. My 275s hook up way better though.
Oh ok. Maybe I may give 255s a shot then....
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Old 02-28-2015, 11:52 PM   #19
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I see now...275s...
not good fir me because I have an 8" rims ...so max width is 255s.

hmmmmm...I am thinking that in need some LCAs to help my tires grip on take off, too, no???!!!!
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Old 03-01-2015, 12:48 PM   #20
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bought some BMR LCAs ...on ebay...cheap...[89 bucks!]
so let's see if I stick better...
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Old 03-01-2015, 06:52 PM   #21
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It might help. I have the performance package, which I believe has the gt500 LCAs, and still had trouble with my 255s.
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Old 03-03-2015, 08:25 AM   #22
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Now...
I am thinking of going from 235/50/18 to 245/45/18. I am getting a good deal on some Cooper RS3-s tires. I know that there is a 2.14% speed variance [too fast]...but i should be ok, correct?
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Old 03-03-2015, 12:12 PM   #23
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Anyone feel a 245/45/18 tire will affect mpg and wear too much because it will spin 10x more than a 235/50 18?
Thank You, very much!!
Allan
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Old 03-03-2015, 05:37 PM   #24
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Anyone feel a 245/45/18 tire will affect mpg and wear too much because it will spin 10x more than a 235/50 18?
Thank You, very much!!
Allan
The change from 235/50 to 245/45 shouldn't affect your MPG much. Being 2.1% smaller in dia isn't that bad, and it's only a small difference in speedometer reading. When speedometer reads 60 mph you will actually be going 58 3/4 mph.
Not sure why you're not going with the 255/45 which would only be 1.1% smaller and a wider tire.
I can only assume it's because the good deal you mentioned is on the 245/45.
I'm surprised no one brought up a discussion of a stickier tire.
Good luck!
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Old 03-03-2015, 05:54 PM   #25
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The change from 235/50 to 245/45 shouldn't affect your MPG much. Being 2.1% smaller in dia isn't that bad, and it's only a small difference in speedometer reading. When speedometer reads 60 mph you will actually be going 58 3/4 mph.
Not sure why you're not going with the 255/45 which would only be 1.1% smaller and a wider tire.
I can only assume it's because the good deal you mentioned is on the 245/45.
I'm surprised no one brought up a discussion of a stickier tire.
Good luck!
Thank You! DieHard
hmmmm...less mph...less tickets?
MPT is rewriting my tunes for tire change so speedo will be correct soon.
I got A Super deal on the [4] Sticky Icky 245/45/18 RS3-S's. [ I have snow tires on right now in NYC--- If I didn't have snows I would gotten RS3-A's.]
With the 93 Perf/Race tune I want these tires & the LCAs to help hook up on straights & turns.
thx
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Old 03-04-2015, 11:48 AM   #26
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Thank You! DieHard

hmmmm...less mph...less tickets?

MPT is rewriting my tunes for tire change so speedo will be correct soon.

I got A Super deal on the [4] Sticky Icky 245/45/18 RS3-S's. [ I have snow tires on right now in NYC--- If I didn't have snows I would gotten RS3-A's.]

With the 93 Perf/Race tune I want these tires & the LCAs to help hook up on straights & turns.

thx

Can't you just adjust the RPMs for your new tires on your tuner your self? Anyone else do this?


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