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What's the biggest tire size I can go to if I have 17"rims and plan on buying the Eibach lowering springs(1.5 drop). I'm hoping for at least 45 or 50. Any help appreciated. Thanks!
 

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I'm also trying to figure out the same thing. I want to go as big as possible without much negative effects. I'm using eibachs too...1.5". If I can get something close to a B15 tire size, I might go with 16 or 17.
 

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Thanks Yos. :)
 

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bitter old man
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I disagree to the Plus sizing info provided by CarbonBlack200.

My calculations indicate 205/45-16 and 215/40-17 to maintain speedometer accuracy (hah!). This is for a USDM B14 SE-R which comes stock with 195/55-15.

I have run 215/40-16 while running 1 inch or so drop on my B13. I suspect a B14 with a mild drop can do the same.
 

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Right. I gave those numbers because i was thinking about the speed meter accuracy and minimum negative effects. If you ran 215 and didn't have any problems, i was probablly wrong then. Experience is everything.
 

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I'll probably go with the 16's anyway. Hope I can find this thread when I am ready to buy wheels.
 

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bitter old man
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To calculate appropriate wheel and tires, you need to calculate stock wheel/tire diameter so you have a baseline for maintaining speedometer and odometer accuracy.

Formula is:
Wheel diameter + (tire width*aspect ratio/100*2)/25.4.

Wheel diameter is in inches, tire width in millimeters. 25.4 converts the tire height from millimeters to inches. Aspect ratio is tire sidewall height divided by tire width. One tire's measured height and width don't necessarily match a different manufacturer's measured values for the same size tire, so exact comparison isn't possible, but it's close enough.

195/50-15 = 195 mm tire width, 50 aspect ratio, 15 in rim diameter.

Use a spreadsheet to generate a matrix of possible sizes and select those that deviate less than 2% from stock. E-mail me direct and I'll send you mine in Lotus 1-2-3 format as Excel sucks!.
 

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GETTING SPRINGS

OK, I WANNA GET SPRINGS AND I HEARD THAT THE EIBACHS WERENT GOOD, THE H&R WERE, BUT THE PROGRESS ARE THE BEST TO GET... ALSO, WHAT IS THE LOWEST I CAN DROP MY SPEC WITH MY STOCK TIRES AND RIMS?
 

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They are good there great in fact

Eibach springs are good, there great in fact. Most of the 24 Hour and American Lemans race cars use them, so you know if there on high dollar production super cars then they have to be good! Hell Eibach has been around for a long long time. H&R is aweome as well, again being used on high dollar super race cars such as the Mustang Saleen S7R so you know there quality too. It just seems that there are more Eibach applications for our cars than H&R. But maybe H&R is stepping up on our applications too.
 
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Holden,

I got some Sprint Springs on order and should have them by next weekend. Should be getting a 2" drop. Will this work with stock wheels???? I guess we'll find out!!!!:D
 
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