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06-07-2010, 10:19 AM #1
backspacing for 20X9 w/2.25 level on '08
Ok, I have searched the forums and I have found that I can run a 305/50/20 on a 20x9 with a 2.25" level kit, however I cant find a definitive answer for the backspacing and offset (which is confusing after looking at so many posts).
I have a 08 Silverado Crew Cab, 2WD.
Is anyone running this setup that can help me out? I have used the tire calcs. and I know the 305/50/20 is a 32x12.
On a similiar note....does anyone think a 275/55 would look better under my setup or should I stay with the 305/50? According to the tire calcs., the 275/55 is only.05" smaller sidewall height, but is 1.2" narrower.
06-07-2010, 10:41 AM #2
i'm running 285/65/18 on -12mm offset rims and a 3" suspension lift. only minor rubs on the plastic fender which went away after i trimmed it with scissors. a 305 size tire will definitely rub up front, especially with just a 2.25" leveling kit. many ppl have fit 33" tires (285) with leveling kits but rubs always a problem especially when you offset them. i wouldn't go higher than 285 unless you put a real lift on it.ROTARYENGINEPETE
'07 GMC SIERRA SLT | Z71 | 4X4 | 5.3L FF
ROUGH COUNTRY 3" PREMIUM SUSPENSION LIFT + ADD-A-LEAF
18" ATX THUG WHEELS
33" NITTO TRAIL GRAPPLER TIRES
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06-07-2010, 11:36 AM #3
Interesting. According to the tire calculators, the 305/50/20 is a 32x12. Which in most of the posts I have read, people run 33 with minor trimming and a leveling kit. I assumed I would be good, I just wanted to make sure I have the proper backspacing.2008 Silverado Crew Cab 2WD
2.25" leveling kit
20x9 0mm offset MB 72s
305/50/20 Nitto Terra Grapplers
Line-X color matched Spray in bedliner
2001 Camaro Z28
Lots of Sh**......12.2 in 1/4 mile.
06-07-2010, 11:52 AM #4
yeah, thats weird how the tire code works(the 305 is the width and the 50 is the aspect ratio). mine is a 33" tire, and yours would be a 32" tire. i'd be careful still as the width of the tire also comes into play not just the size, if it is really wide it can still rub. good luck though i hope it turns out looking great!
06-07-2010, 11:59 AM #5
06-08-2010, 02:45 PM #6
It looks like after some more research and talking with a couple of guys on here that I should go with a 5.5" backspacing with a 18mm offset.
06-08-2010, 07:37 PM #7
i got a 3" liift from rc and im running 20x9 iwth a 0mm offset wrapped in 305/50/r20 toyo at and they dont rub at all.
Fabtech/Banks Ram Air |Fuel Off Road/ 315/70/17 duratracs |Hyper tech / Spencershids |Color Matched Bowtie |15% Tint on Front Windows|20% Tint on Back Windows
Chevy Ridin' High
"Black rims are as cool as a boner at a swim meet"
06-08-2010, 07:40 PM #8
06-09-2010, 01:51 PM #9
So if I have done my homework correctly, going from a +18 offset to a 0 offset, the wheel will stick out a little over a half inch more, which I would rather have. I didnt want the tucked in look.
Thanks for the help Burden33! You pretty much gave me exactly what I was looking for.
Last edited by bpaulk; 06-09-2010 at 01:53 PM.
06-09-2010, 10:17 PM #10
no problem only here to help
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