Will 345/30-20s fit? How 'bout 345/30-19s?
06-27-2006, 06:16 PM
#4
TECH Addict
Measuring from the outside edge of the spring to the hub (put a straight edge across the hub to help you measure accurately) will give you the absolut maximum backspacing possible, you'll have to take into account the "bulge" in the tire as well.....
06-27-2006, 06:32 PM
#5
Check this out:
Offset
Offset is the distance from the rim's mounting surface to the centerline. This Camaro originally came with 16x8" rims with 0mm offset in the front and a positive 16mm offset for the rear rims. Positive offset means the mounting surface is moved towards the outside (away from the center of the car) of the rim. Negative offset is the opposite.
Backspacing
Backspacing is the inside depth of the rim. It can easily be measured by putting a yardstick across the backside of the rim, and measuring the distance between the mounting surface and the yardstick.
It can also be calculated, as shown below. Don't forget to add for the rim's lip and tire bulging past the rim (I use about .25"). Our 16x8" 0mm offset front rims would have 4.25" of backspacing. The positive 16mm rear rims (16mm/25.4 = 0.63") have about 4.9" of backspacing
Measuring Maximum Backspacing
The 89 Camaro can fit rims with a maximum of 5" front and 5.85" rear backspacing. This can be measured, or found out the hard way through trial and error. To measure it, bolt a flat piece of metal or wood to your hub using 2 studs. Towards the end of the metal, drill a hole and screw a long bolt through it. This bolt should be 1 radius from the hubs centerline (If you will be putting on 26" dia tires, the bolt should be 13" from the hubs centerline). Spin the measuring tool around, and screw the bolt in untill it no longer touches anything. The length of the bolt is your max backspacing. If you have suspension pieces jutting in the wheelwell, try different bolt locations to make sure nothing is in the way. Do this with the wheels turned left and right as well.
Offset
Offset is the distance from the rim's mounting surface to the centerline. This Camaro originally came with 16x8" rims with 0mm offset in the front and a positive 16mm offset for the rear rims. Positive offset means the mounting surface is moved towards the outside (away from the center of the car) of the rim. Negative offset is the opposite.
Backspacing
Backspacing is the inside depth of the rim. It can easily be measured by putting a yardstick across the backside of the rim, and measuring the distance between the mounting surface and the yardstick.
It can also be calculated, as shown below. Don't forget to add for the rim's lip and tire bulging past the rim (I use about .25"). Our 16x8" 0mm offset front rims would have 4.25" of backspacing. The positive 16mm rear rims (16mm/25.4 = 0.63") have about 4.9" of backspacing
Measuring Maximum Backspacing
The 89 Camaro can fit rims with a maximum of 5" front and 5.85" rear backspacing. This can be measured, or found out the hard way through trial and error. To measure it, bolt a flat piece of metal or wood to your hub using 2 studs. Towards the end of the metal, drill a hole and screw a long bolt through it. This bolt should be 1 radius from the hubs centerline (If you will be putting on 26" dia tires, the bolt should be 13" from the hubs centerline). Spin the measuring tool around, and screw the bolt in untill it no longer touches anything. The length of the bolt is your max backspacing. If you have suspension pieces jutting in the wheelwell, try different bolt locations to make sure nothing is in the way. Do this with the wheels turned left and right as well.
06-27-2006, 06:39 PM
#7
Yep your version is easier, but that one has a picture 
Gotta crawl back under there tomorrow and do some real measuring. I think I might have finally found a street tire...
Oh... One more question -- how do you know how wide a rim needs to be to fit a tire? Like I said those are 13.9" so I'm doubting they'll fit on a 10" rim...
Gotta crawl back under there tomorrow and do some real measuring. I think I might have finally found a street tire...
Oh... One more question -- how do you know how wide a rim needs to be to fit a tire? Like I said those are 13.9" so I'm doubting they'll fit on a 10" rim...
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06-27-2006, 08:31 PM
#9
Originally Posted by TurboBerserker
Yep your version is easier, but that one has a picture
Gotta crawl back under there tomorrow and do some real measuring. I think I might have finally found a street tire...
Oh... One more question -- how do you know how wide a rim needs to be to fit a tire? Like I said those are 13.9" so I'm doubting they'll fit on a 10" rim...
Gotta crawl back under there tomorrow and do some real measuring. I think I might have finally found a street tire...
Oh... One more question -- how do you know how wide a rim needs to be to fit a tire? Like I said those are 13.9" so I'm doubting they'll fit on a 10" rim...
Take your measurements carefully. Triple check them and do BOTH sides.
06-28-2006, 02:55 PM
#10
Originally Posted by SnakeOiler
Just go with the tire manufacturer's recommendations. The 345/30/19 Pilot takes a 12"-13.5" wheel. The section width on a 12" rim would be 13.6" (13.9" on a 13.5 wheel). If you're lucky, you might be able to squeeze a 7.75" backspace, but even still the tires will poke out about an inch or so past the fender.
Take your measurements carefully. Triple check them and do BOTH sides.
Take your measurements carefully. Triple check them and do BOTH sides.
Yep, you are correct sir. Berserker is back to being sad. I had even found the 20x12 rims...
On a positive note, I don't need to buy $1000 custom rims. I am really starting to think 305s are the max we can squeeze without tubs and narrowed rear ends.
Did some more measurements and spoke to a custom wheel shop.
the SSS has 13" of clearence back there which means: 10 inch rims (which are really 11"??) and a 305 tire is the max without finagling.
Last edited by TurboBerserker; 06-28-2006 at 03:36 PM.