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  #1  
Old 12-13-2007, 04:34 PM
redlinedeath redlinedeath is offline
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wheel sizing question

alright, so if my understanding and research is correct, our wheels have a 55mm backspacing. now, since those measurments are on 7.5" wheels, will that backspacing number be different on 7" wide wheels? also if i add a wheel spacer to correct the backspacing, will that be bad for the car?
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Old 12-13-2007, 05:38 PM
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On a 7" wide wheel you can run a range of offsets, I'd estimate anything between +35 mm and +60 mm should work. This is assuming you go down to a 205/55/16 tire, which is a perfect match to the stock diameter, and should fit a 7" wide wheel very well. As you reduce the offset though you'll be putting more stress on your bearings so try not to go too far.

If you happen to find a wheel with more than +60 (hugely unlikely) you'll need spacers, but otherwise there should be no problem.

Do you have a rim in mind?
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Old 12-13-2007, 06:18 PM
redlinedeath redlinedeath is offline
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my friend gave me a set, 17x7but theyre like a no name brand, never heard of them, and i dont know the offset, but when i tested them on the svx, with his tires, it looked like it may have been an issue with my newer bigger tires, and i cant even find the company on the internet. and heres the other thing, tires are expensive, and ive got 2 falken azenis st115 that are brand new i got from free from work, but the thing is, the sizes dont match when you go up a rim size, and theyre pretty big, and may not fit, and im sure the speedo will be way off, but its cheaper to buy to new tires that match those, then a set of 4. theyre 225/45 zr17.
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Old 12-13-2007, 06:26 PM
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225/45/17's should work well enough. If you look on the backside of the wheel, there is often information printed there that can tell you the offset. Just look till you see something that looks like an offset number, and that's probably it.
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92 Ebony Mica LS-L "A Rolling Restoration": 223,250 KM - Sleeping
2007 STi 6MT, Stance GR+ coilovers, PWR Rad, JDM hood badge, svxfiles 6000K HIDs, JDM Clear Corners, $15/15 min mod, $20/20 min mod, Energy Swaybar Bushings, Hella Supertones horns, Gold STi BBS rims, Group A lightweight crank pulley, A/C system removed, Custom header-back exhaust, Hybrid carbon/metal rear sway bar, restored headlights with CCFL halos
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Old 12-13-2007, 07:09 PM
redlinedeath redlinedeath is offline
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awesome, as soon as my brother gets home, im going to pull one out of my trunk and check. haveing this big of a tire/wheel package, will that affect my acceleration, and speedo accuracy?
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Old 12-13-2007, 07:14 PM
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A 225/45/17 tire will be almost an exact match to stock, so your speedo will not be affected. Your acceleration may be positively or negatively affected depending on the weight of the rim/tire combo. If it's lighter than stock, you'll accelerate faster. Heavier than stock = slower.
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92 Ebony Mica LS-L "A Rolling Restoration": 223,250 KM - Sleeping
2007 STi 6MT, Stance GR+ coilovers, PWR Rad, JDM hood badge, svxfiles 6000K HIDs, JDM Clear Corners, $15/15 min mod, $20/20 min mod, Energy Swaybar Bushings, Hella Supertones horns, Gold STi BBS rims, Group A lightweight crank pulley, A/C system removed, Custom header-back exhaust, Hybrid carbon/metal rear sway bar, restored headlights with CCFL halos
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Old 12-13-2007, 09:29 PM
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awesome, thanks!
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