18x8 40mm offset fitment question - TCCoA Forums
 
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post #1 of 4 (permalink) Old 06-30-2016, 12:22 AM Thread Starter
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18x8 40mm offset fitment question

Guys, thinking of replacing my current 18x8.5 35mm offset wheels with 18x8 40mm offset wheels. ( I like the look of these new ones better than what I've got). Do you guys think they are going to look too sunken in to what I've got now? I hate the look when the wheels are tucked way in. Thinking of maybe running a spacer to make up the difference but I've never liked the idea of running a wheel spacer. Let me know what you guys think. Thanks.

1997 Ford Thunderbird, Built NA 2V/ T-45
1997 Ford Explorer AWD 5.0L
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post #2 of 4 (permalink) Old 06-30-2016, 03:25 PM
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Originally Posted by 281_TBird View Post
Guys, thinking of replacing my current 18x8.5 35mm offset wheels with 18x8 40mm offset wheels. ( I like the look of these new ones better than what I've got). Do you guys think they are going to look too sunken in to what I've got now? I hate the look when the wheels are tucked way in. Thinking of maybe running a spacer to make up the difference but I've never liked the idea of running a wheel spacer. Let me know what you guys think. Thanks.
This is a great website for tire calculations.

Custom rims, wheel tire packages for your ride - RIMSnTIRES.com

According to this, if you go with a 245/45/18 tire, which is the same outside diameter as a stock 225/60/16, your new setup will stick out .4" more than previous, and will also extend inward .4" (because the wheel is one inch wider than the outgoing wheel) The tire is also .7" wider, so you'll have about .35" more width on either side.

97 Thunderbird LX (The GT Bird)
2003 Explorer WAP block with Modular Head Shop "street ported" heads and Stage 2 PI NA cams, 75mm Accufab throttle body, C&L upper intake plenum, Kooks 1.75" primary/3" collector headers, 2.5" full exhaust with mid mount Magnaflow dual in/out muffler, 24lb/hr injectors, 80mm MAF, Tuning from Don @ www.lasotaracing.com, CAI that feeds from fenderwell. Jmod, 3.73:1 TL in Mark VIII carrier, Mark VIII aluminum LCAs, 93 Mark VIII driveshaft, PBR brakes (soon to be Cobras), 18x9 wheels with 35mm offset, 255/40/ZR18 Tires, Front and Rear strut/shock bracing, GR-2 shocks, Eibach 1.5" springs, 1989 SC front and rear sway bars.
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post #3 of 4 (permalink) Old 07-10-2016, 07:19 PM
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Originally Posted by 281_TBird View Post
Guys, thinking of replacing my current 18x8.5 35mm offset wheels with 18x8 40mm offset wheels. ( I like the look of these new ones better than what I've got). Do you guys think they are going to look too sunken in to what I've got now? I hate the look when the wheels are tucked way in. Thinking of maybe running a spacer to make up the difference but I've never liked the idea of running a wheel spacer. Let me know what you guys think. Thanks.
KMC Wheels KM775 Rockstar Car Matte Black Wheel (18x8"/5x108, 114.3mm, +42mm offset) These are my wheels. Mounted Nitto G2 255's. Had slight clearance problem with fronts, but 10 minutes with a dremel and medium stone solved it. No spacers required.
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post #4 of 4 (permalink) Old 07-10-2016, 08:06 PM
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If you can get a 35 or 36mm offset, the wheel will move away from the middle of the car, but not too far to rub on anything. The larger the number, the closer to the suspension it gets.

97 Thunderbird LX (The GT Bird)
2003 Explorer WAP block with Modular Head Shop "street ported" heads and Stage 2 PI NA cams, 75mm Accufab throttle body, C&L upper intake plenum, Kooks 1.75" primary/3" collector headers, 2.5" full exhaust with mid mount Magnaflow dual in/out muffler, 24lb/hr injectors, 80mm MAF, Tuning from Don @ www.lasotaracing.com, CAI that feeds from fenderwell. Jmod, 3.73:1 TL in Mark VIII carrier, Mark VIII aluminum LCAs, 93 Mark VIII driveshaft, PBR brakes (soon to be Cobras), 18x9 wheels with 35mm offset, 255/40/ZR18 Tires, Front and Rear strut/shock bracing, GR-2 shocks, Eibach 1.5" springs, 1989 SC front and rear sway bars.
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