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Discussion Starter #1
I've been looking at wheels and tires and I want 18's but I want more meat on them than the usual set up (225-45-18, which is slightly smaller than the stock diameter). 235-45-18 seems like it should fit without any problems...its .79" wider than stock, and .17" taller...which knocks the speedo off by 1/2 a mph. Anyone with any knowledge of this, let me know... thanks
 

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No more Foz !
03 Impreza Sti
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depends on the wheel offset as well - should be fine with an et48, any higher and a 225 is probably max..
 

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No more Foz !
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Looking at this size also but tyre choice is very limited in the uk with those dimensions..will probably end up with 225/45/18
 

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Mr. November 2008
2015 BMW 335d xDrive GT Auto
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225/45-18 is pretty limited too, unless you like Bridgestones...

On mine I could go to 225/40-18 and get a whole load of the popular performance tyres available (e.g. F1's, T1R's, plenty of others) but I'm not sure about the smaller diameter.

Or I could go to 235/40-18, which has some quite good tyres and matches the original 225/45 very closely in size.

Just forked out for 4 tyres on the wife's RX8. 225/45-18's would you believe...
 

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Really? I would think you guys could get the same tires we get in the U.S.in 225/45-18. Like the Bridgestone S03s, Michelin Pilot Sport 1, Pirelli P Zero, Falken RT615, Yokohama Advan AD07, B.F. Goodrich T/A KDW 2, Toyo t1r,
 

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Mr. November 2008
2015 BMW 335d xDrive GT Auto
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NahdaDamdyke said:
Really? I would think you guys could get the same tires we get in the U.S.in 225/45-18. Like the Bridgestone S03s, Michelin Pilot Sport 1, Pirelli P Zero, Falken RT615, Yokohama Advan AD07, B.F. Goodrich T/A KDW 2, Toyo t1r,
OK, I was exaggerating a bit. In 225/45-18 I can see (in W, Y and Z-rated): *** Corrected typo ***

No S03 as far as I know.
Michelin PS but not PS2
No Falkens that I can find
Dunlop SP Sport 9000 but not the later SP Sport Maxx
P Zero Rosso and Nero - yes
No Goodyear F1.
Toyo T1R - yes, a fairly recent addition.
No Yokohamas

mytyres.co.uk the list is actually 10 tyres available, and blackcircles.co.uk lists 11.

For 225/40-18 mytyres list 66, and blackcircles list 42, including the Goodyears, Yokos and SP Sport Maxx ones.
 

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karma mechanic said:
225/45-18 is pretty limited too, unless you like Bridgestones...
You said 225 in this post and that is the size I searched. I wanted to go 235/45-18 with an 8" rim but couldn't find tires.
 

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Mr. November 2008
2015 BMW 335d xDrive GT Auto
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That's my fingers hitting different keys than intended - corrected now.

On mine the rims are 7.5 inch, so 235/40 is actually slightly to wide (for the rim, not the car)
 

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No more Foz !
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I ordered 4 T1R's today from Micheldever tyres :)

Got my PFF7's now and have ordered some 3mm spacers so with any luck I'll have them on by early next week - can't wait :D


btw I tried a wheel on with 225/40/18's to see what it was like and tbh it looked very odd with the stock ride height. Plus the diameter is way out - my speedo already reads about 7% fast as it is :(
 

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Bartop said:
I ordered 4 T1R's today from Micheldever tyres :)

Got my PFF7's now and have ordered some 3mm spacers so with any luck I'll have them on by early next week - can't wait :D


btw I tried a wheel on with 225/40/18's to see what it was like and tbh it looked very odd with the stock ride height. Plus the diameter is way out - my speedo already reads about 7% fast as it is :(
can you pls explain the need of spacers?
why not go for 245/40/18?
 

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No more Foz !
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Only needed spacers as the PFF7 Prodrive wheel has an offset of ET51 against ET48 for the stock wheel.
As it happens they were fitted today with 225/45/18 toyo T1r's and whilst they were close to the strut at the back it didn't need the spacers although I might fit them later just to be sure.
A 235 wouldn't have fitted with that wheel though...
 

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Discussion Starter #16 (Edited)
so its not good to run 235 on a 7.5" rim?

so if I went with an eight inch rim, and 235/45/18, what offset should I look for?

Is there anyway to run an offset to that it could have a deep look to it... I always get offset confused, but a lower number means it would be deeper or further in right? Example: an offset of 38 is deeper than 50?
 

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No more Foz !
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Prodrive UK recommend a 235/45/18 tyre so that would be fine on an ET48 wheel I would say
 
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i am running 225/40/18 (bf goodrich g-force) and completely satisfied with the tire. Somewhat noisier at first but became accustomed to over time. My only concern is the offset of the Motegi wheel, (45mm I think) & if it could cause any harm to the drivetrain over time? More space than I would like between tire & fender, but I will take handling over negative space anyday. No means to slander, but skrew the geolander...
 

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Mr. November 2008
2015 BMW 335d xDrive GT Auto
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sential said:
so its not good to run 235 on a 7.5" rim?
My only source for this is the range of rim widths shown on Tirerack.com when you look at the specs for each tyre. For 235/40-18 the range is 8.0-9.5 inches for the ones I've looked at.

Whether that means that 7.5 is a no-no, or just outside the preferred range I don't know !
 

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karma mechanic said:
My only source for this is the range of rim widths shown on Tirerack.com when you look at the specs for each tyre. For 235/40-18 the range is 8.0-9.5 inches for the ones I've looked at.

Whether that means that 7.5 is a no-no, or just outside the preferred range I don't know !
It's fine just not optimum. Most manufacturers recommend tires that are 1" to 1.5" wider than the rim (25MM- 37.5MM). Especially when you start getting into 45 series tires or lower. Those short, stiff sidewalls aren't made to be bulged out on too narrow of rims.Llike I said, it will work it's just not ideal.

And by the way, those tires I mentioned eaelier in 225/45-18 are made. don't know if you can get them but they do make them.
 
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