Offset question - Camaro5 Chevy Camaro Forum / Camaro ZL1, SS and V6 Forums

Maro99 · 12-10-2009, 01:15 AM

I dont know much about rims and was wondering what is the best/right offset to get on a 2010 SS. Also what is backspacing and do I need to worry about that when buying aftermarket rims?? Should there be a different offset in the front and back? Any info is appreciated, Thanks.

fixxxer525 · 12-10-2009, 01:29 AM

I can't really tell you, but when I ordered thru Forgeline they had all the info for a Camaro, wheel size 20x10.5 on all fours.

Sir Nuke · 12-10-2009, 09:08 AM

Maro99, to actually answer the questions you have, we need more info. As far as which offset is best/right, it depends on what size wheels you are putting on (the width). Just like offset, backspacing is a measurement, just different. Offset is a measurement in MM (millimenters) either + or -, that the hub (where the wheels mounts), if you have a 0 (zwer) offset, the hub is perfectly centered. for example the stock 20's fronts are a +34mm offset, which means that the wheel is SUCKED IN under the wheel well 34mm from perfect center.

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Backspaceing is a measurement in inches from the mounting surface to the insde of the wheel edge.

SO, should you be worried about backspacing? YES, but you would be worried about OFFSET too, as they are basically the same, just different ways to measures where the wheel will sit within the wheel well.

Your last ? well if you are getting different size wheels, then the answer is YES, if you are getting the same size wheels front and back, the asnwer would be NO.

Doc · 12-10-2009, 11:35 AM

The wider you go, the harder it is to find off-the-shelf rims that will fit because of clearance issues. The backspace is the distance from the pad (the center of the rim where the bolt holes are) to the back of the rim edge. The maximum allowed there is going to depend on your suspension and how much distance is available before the rim contacts the strut. I have a 6" backspace on my 9.5" rims and they clear fine both front and back.

The offset depends on the style of wheel and how much movement in or out is needed for the spokes to clear the brake calipers. My rims have a 28mm offset for example. The stock rims have a 35mm offset. The spokes on my rims have better clearance than stock so they could tuck in a little more which allowed them to fit without clearance issues on the fender lip.

The first critical measurement is clearing the brakes; once you know what that distance is, you can check the other dimensions for clearance. It will depend on the spokes of the style of wheel you choose as to what that measurement will be. Measure from the base plate of the hub where the bolt studs are, to the top of the brake caliper and add a few millimeters for clearance. That's the distance you need from the base of the rim pad to the edge of the spoke where it passes over the brake caliper.

Hope all that makes sense!

Maro99 · 12-10-2009, 12:08 PM

Thanks for the help guys.. Im still not exactly sure on which rims/sizes I want yet but when I find out I will post them up. That stuff is pretty complicated lol.

12-10-2009, 01:15 AM	#1
Maro99 Drives: Heel toe express.. Join Date: Dec 2009 Location: North Charleston, S.C Posts: 1,500	Offset question I dont know much about rims and was wondering what is the best/right offset to get on a 2010 SS. Also what is backspacing and do I need to worry about that when buying aftermarket rims?? Should there be a different offset in the front and back? Any info is appreciated, Thanks.

12-10-2009, 09:08 AM	#3
Sir Nuke Master of All Things Drives: '26 Corvette Stingray Join Date: Jul 2009 Location: Southeast of Houston, Texas Posts: 22,761 View My Garage	Maro99, to actually answer the questions you have, we need more info. As far as which offset is best/right, it depends on what size wheels you are putting on (the width). Just like offset, backspacing is a measurement, just different. Offset is a measurement in MM (millimenters) either + or -, that the hub (where the wheels mounts), if you have a 0 (zwer) offset, the hub is perfectly centered. for example the stock 20's fronts are a +34mm offset, which means that the wheel is SUCKED IN under the wheel well 34mm from perfect center. Backspaceing is a measurement in inches from the mounting surface to the insde of the wheel edge. SO, should you be worried about backspacing? YES, but you would be worried about OFFSET too, as they are basically the same, just different ways to measures where the wheel will sit within the wheel well. Your last ? well if you are getting different size wheels, then the answer is YES, if you are getting the same size wheels front and back, the asnwer would be NO. __________________

12-10-2009, 11:35 AM	#4
Doc Dances With Mustangs Drives: 2010 1SS/RS MT Join Date: May 2009 Location: USA Posts: 3,819 View My Garage	The wider you go, the harder it is to find off-the-shelf rims that will fit because of clearance issues. The backspace is the distance from the pad (the center of the rim where the bolt holes are) to the back of the rim edge. The maximum allowed there is going to depend on your suspension and how much distance is available before the rim contacts the strut. I have a 6" backspace on my 9.5" rims and they clear fine both front and back. The offset depends on the style of wheel and how much movement in or out is needed for the spokes to clear the brake calipers. My rims have a 28mm offset for example. The stock rims have a 35mm offset. The spokes on my rims have better clearance than stock so they could tuck in a little more which allowed them to fit without clearance issues on the fender lip. The first critical measurement is clearing the brakes; once you know what that distance is, you can check the other dimensions for clearance. It will depend on the spokes of the style of wheel you choose as to what that measurement will be. Measure from the base plate of the hub where the bolt studs are, to the top of the brake caliper and add a few millimeters for clearance. That's the distance you need from the base of the rim pad to the edge of the spoke where it passes over the brake caliper. Hope all that makes sense! __________________ Blue Angel is here!! 1SS/RS LS3 M6 IBM

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12-10-2009, 01:29 AM	#2
fixxxer525 Account Suspended Drives: 01S10,01CBR600,05Ducati, 10 2SS/RS Join Date: Aug 2006 Location: San Diego Posts: 376	I can't really tell you, but when I ordered thru Forgeline they had all the info for a Camaro, wheel size 20x10.5 on all fours.

12-10-2009, 12:08 PM	#5
Maro99 Drives: Heel toe express.. Join Date: Dec 2009 Location: North Charleston, S.C Posts: 1,500	Thanks for the help guys.. Im still not exactly sure on which rims/sizes I want yet but when I find out I will post them up. That stuff is pretty complicated lol.