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Old 05-14-2012, 10:12 PM   #1
twostep
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Default question regarding 18" rims and ion springs on a BE

I know.... another lowering thread. Sorry but i cant find the info im looking for. It seems to me that everyone with ion springs and a legacy BE is running 17" rims. I have 18" rims with a +45mm offset, wrapped in 225/40/18 and im close to buying a used set of ion springs and GR2s. My question is simple.... will it work?
Does anyone here run this setup?
With stock suspension im looking at about 2" of clearance in the front which is no problem.
The rears however, have just over an inch from what i can tell and this is what concerns me.
If anyone is running this setup successfully, please let me know. I can take pictures to show the gap if need be.
Thanks

edited to add offset.
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Old 05-15-2012, 12:45 PM   #2
Cervantes
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I had 18" rims with springs and it worked fine...they weren't ion springs though.
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Old 05-16-2012, 06:38 AM   #3
jeisen
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The diameter of your wheels has nothing to do with the tire rubbing. Geometry at play is tire diameter, tire width, wheel width and wheel offset.

Nominal Diameter:
225/40/18 = 25.1"
225/45/17 = 25.0"
205/55/16 = 24.9"

This means that a 225/40/18 tire would theoretically extend .05" further into the wheel well over a 225/45/17.

Nominal Width should be the same between the 225/45/17 and 225/40/18.

A wider wheel will make the tire wider, but smaller in diameter.

Actual tire dimensions can vary from tire to tire. For exact specs, check tirerack's site for your specific tires.
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Old 05-16-2012, 09:39 PM   #4
twostep
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Quote:
Originally Posted by jeisen View Post
The diameter of your wheels has nothing to do with the tire rubbing. Geometry at play is tire diameter, tire width, wheel width and wheel offset.

Nominal Diameter:
225/40/18 = 25.1"
225/45/17 = 25.0"
205/55/16 = 24.9"

This means that a 225/40/18 tire would theoretically extend .05" further into the wheel well over a 225/45/17.

Nominal Width should be the same between the 225/45/17 and 225/40/18.

A wider wheel will make the tire wider, but smaller in diameter.

Actual tire dimensions can vary from tire to tire. For exact specs, check tirerack's site for your specific tires.

sssooooo.... will it work?

If i understand what youre saying, 225/40/18 would have a diamether that is 5/100ths (but i think you meant 1/10th) of an inch bigger than a 225/45/17, which is negligible imo, and would theoretically work as well as those running 17" rims? and thus, not cause any rubbing issues.

The recommended tire size for my rim on a BE is 215/40 and since the price for that size is absolutely absurd, I opted for the marginal difference in a more common size at a much better price on the 225/40. My wheels are 7.5" wide, and with the 225s come very close in line with the bottom of the fender, hence my concern.

Since ive seen many people report great results with 225/45/17 and ion springs, and your comment regarding the marginal difference of upping to 225/40/18, can i go ahead and assume Ill have no probs?

I just noticed on my stock suspension:
The rear passenger wheel well has 1.75" of clearance between the bottom of the fender, and the uppermost portion of the tire that is in line with the fender. The rear driver side, has .75" of clearance. Obviously my shocks are going. I dont know what would be a 'normal' space, so i dont have much to go on.
This is why im just asking if anyone runs this suspension with the same tires size as me.

Last edited by twostep; 05-16-2012 at 10:09 PM.
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Old 05-17-2012, 08:01 AM   #5
jeisen
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Quote:
Originally Posted by twostep View Post
sssooooo.... will it work?

If i understand what youre saying, 225/40/18 would have a diamether that is 5/100ths (but i think you meant 1/10th) of an inch bigger than a 225/45/17, which is negligible imo, and would theoretically work as well as those running 17" rims? and thus, not cause any rubbing issues.
I can't say that it will work for sure as I have not run your specific combo. The diameter would be 1/10th of an inch bigger. Only 1/2 the diameter (the radius) extends upwards into the wheelwell. Thus your tire would be .05" closer than stock.

I was simply trying to point out how negligible this difference really is. For instance, a new tire with 12/32 tread will extend .375" further into the wheel well than a bald tire.

Quote:
Originally Posted by twostep View Post
The recommended tire size for my rim on a BE is 215/40 and since the price for that size is absolutely absurd, I opted for the marginal difference in a more common size at a much better price on the 225/40. My wheels are 7.5" wide, and with the 225s come very close in line with the bottom of the fender, hence my concern.

Since ive seen many people report great results with 225/45/17 and ion springs, and your comment regarding the marginal difference of upping to 225/40/18, can i go ahead and assume Ill have no probs?

I just noticed on my stock suspension:
The rear passenger wheel well has 1.75" of clearance between the bottom of the fender, and the uppermost portion of the tire that is in line with the fender. The rear driver side, has .75" of clearance. Obviously my shocks are going. I dont know what would be a 'normal' space, so i dont have much to go on.
This is why im just asking if anyone runs this suspension with the same tires size as me.
As I tried to explain before the tire type is just as important as the tire size since manufacturers and even product lines within a manufacturer vary greatly.

A 225/45/17 Bridgestone RE-11 has an actual tread width of 8.3".
A 225/45/17 Michelin Primacy MXM4 has an actual tread width of 7.7"

the .4" (10mm) difference between a 215 and a 225 is less than the variance you can see within the same nominal tire size.
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