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+18 or +30 Offset for 20" wheels???? 07 Crew Cab LT

20"-9" Wheels

+18 or +30 Offset for 20" wheels???? 07 Crew Cab LT

Postby matt4487 [OP] » Dec 16 2011, 1:28am

2007 silverado crew cab lt 2wd. i am getting ready to buy the rc 3.5" kit and moto metal 951 wheels (20+9) with 33+12.50+20 tires. can anybody tell me what offset i need to get?? thanks

another question- is a 33 12.50 20 the same a a 305 55 20???
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Re: +18 or +30 Offset for 20" wheels???? 07 Crew Cab LT

Postby lilmagoo1 » Dec 19 2011, 10:19pm

yes those are the same size tire. and the + offset will make the tire suck bad into the wheelwale a negative offset will make the tire stick out of the wheelwale. depends on what your looking for i think mine is a +12 offset and its just a bit inside the fender. but im planning on buying something negative offset to give me that wide stance
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+18 or +30 Offset for 20" wheels???? 07 Crew Cab LT

Postby gmctruckguy » Jan 17 2012, 2:36pm

The 305's are 33" x 12" so they are 1/2" narrower.
The first pic is a 20 x 9 with +12mm offset, the second is with a 0mm offset. The +12mm should do.
Oh I guess I should state the grey one is a factory 17" rim and the green one is the 20" rim.
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+18 or +30 Offset for 20" wheels???? 07 Crew Cab LT

Postby gmctruckguy » Jan 17 2012, 2:40pm

Here is a +30mm offset.
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10638His & Hers 2012 Sierra C/C's 6.2L, 4WD, 3.73's, Airaid CAI, Diablo Predator/inTune, Magnaflow Exhaust, Piaa's, 3 1/2" RC Lift, 285 BFG T/A's, Bushwacker Flares, Tuff Country Add-a-Leaf
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Re: +18 or +30 Offset for 20" wheels???? 07 Crew Cab LT

Postby lilmagoo1 » Jan 17 2012, 3:33pm

here is a picture of how i view it, sorry gmctruckguy i got confused of the pictures you showed lol
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: 07.5 Silverado : 3"lift & 1.25" body lift : 295/70R18 Trail Grapplers :
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Re: +18 or +30 Offset for 20" wheels???? 07 Crew Cab LT

Postby SLCCHEVY » Jan 17 2012, 5:21pm

I think the moto metal's look best with a higher offset. I was looking for those exact same wheels, I was going to put Bf goodrich AT KO 285/55/20 on it.
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Re: +18 or +30 Offset for 20" wheels???? 07 Crew Cab LT

Postby BIGBOB » Jan 17 2012, 10:06pm

I was thinking about Moto Metal 951s 18" With a -12 off set. The tire should come out about even with the edge of the fender.
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Re: +18 or +30 Offset for 20" wheels???? 07 Crew Cab LT

Postby jar-man » Jan 18 2012, 1:10am

-12 is going to be more than just even with fender. If you are goi g to run a negative offset get ready to trim.
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Re: +18 or +30 Offset for 20" wheels???? 07 Crew Cab LT

Postby BIGBOB » Jan 18 2012, 8:04pm

jar-man wrote:-12 is going to be more than just even with fender. If you are goi g to run a negative offset get ready to trim.



Even if it's leveled?
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Re: +18 or +30 Offset for 20" wheels???? 07 Crew Cab LT

Postby jar-man » Jan 18 2012, 8:12pm

YES! NNBS trucks have boxed fenders and they are not negative offset friendly. I have close to 6 inches of lift up front and had to trim a bunch of plastic front and back of wheel well to run 33's on a zero offset.
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