20-9" wheels..what's the biggest tire?? - Chevy and GMC Duramax Diesel Forum

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post #1 of 25 (permalink) Old 03-22-2011, 10:13 PM Thread Starter
D04
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20-9" wheels..what's the biggest tire??

I've got some 20-9" wheels on my truck.. What is the biggest tire I can run on the without a lift..I've got some 275/60/20 on there now and am wanting a good AT. Idont mind a little trimming...

Thanks

2008 black Sierra slt crew cab
Moto metal 962 wheels
Kory Willis tuned
Deleted
Transgo

03 black crew cab
single tow tune
straight pipe
130k miles
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post #2 of 25 (permalink) Old 03-22-2011, 10:16 PM
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a 35" can be done but you will need to crank the bars a start cutting...33" would be best

06' CHEVY 2500HD CCSB PULLER/DD
Danville Billet S475
SoCal Stg.2 Heads
SoCal Cam
Mahle Forged Pistons .040 ovr
Hamilton Rods
Floor it pump
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post #3 of 25 (permalink) Old 03-22-2011, 10:26 PM
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Im running a 305/55-20 on a 20x8.5 wheel. I barely cranked and did some slight trimming. It sits like a stock truck with the rear slightly higher than the front.

2006 CCSB LBZ 4x4- Turbo-back 4 inch w/ 5inch tip, K&N intake, EFI Live DP5 by Diesel Addiction, EGR delete, TransGo Jr, Allison Deep Pan, Suncoast Filter Lock, MA Pump Rub Kit, Ipod Aux-in, Weathertech mats, All On Headlight mod, Tow Mirrors, Line-x, B&W Gooseneck hitch, Autometer Sport-comp II Boost and Pyro, 20% tint, Bilstein 5100's, Pacer NBS Smoked Cab lights, 20inch Eagle Alloys, 305-55-20 Trail Grapplers
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post #4 of 25 (permalink) Old 03-22-2011, 10:26 PM
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305/55/20 is the biggest i would go.

02 GMC CC SB SRW 4x4 2500 Black MAX. 4inch MBRP turbo back Duals with 5inch tips, PPE Boost Increase Valve, AFE CAI, Turbo Mouth Piece Mod, 20x9 XD Black n Machined Hoss rims, 305/55/20 MT Baja Atz's,EFI DSP 5 tuned by Nick at DURAMAXTUNER.COM
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post #5 of 25 (permalink) Old 03-23-2011, 07:18 AM Thread Starter
D04
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any pics of some 305/55/20 on trucks

2008 black Sierra slt crew cab
Moto metal 962 wheels
Kory Willis tuned
Deleted
Transgo

03 black crew cab
single tow tune
straight pipe
130k miles
D04 is offline  
post #6 of 25 (permalink) Old 03-23-2011, 09:50 AM
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Here ya go


02 GMC CC SB SRW 4x4 2500 Black MAX. 4inch MBRP turbo back Duals with 5inch tips, PPE Boost Increase Valve, AFE CAI, Turbo Mouth Piece Mod, 20x9 XD Black n Machined Hoss rims, 305/55/20 MT Baja Atz's,EFI DSP 5 tuned by Nick at DURAMAXTUNER.COM
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post #7 of 25 (permalink) Old 03-23-2011, 10:36 AM
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Some of it depends on offset and backspacing also!

Mack: 2004 lb7
1960 f100 Cummapart conversion


Ex's:2006 LBZ ppe tuned
2007.5 LMM s366. 12.4@109
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post #8 of 25 (permalink) Old 03-23-2011, 10:03 PM Thread Starter
D04
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Is there a way to figure out my offset and baxkspacing? Idont want to drop a bunch of money on tires and have then rubbing like crazy

2008 black Sierra slt crew cab
Moto metal 962 wheels
Kory Willis tuned
Deleted
Transgo

03 black crew cab
single tow tune
straight pipe
130k miles
D04 is offline  
post #9 of 25 (permalink) Old 03-23-2011, 10:54 PM
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It can be measured but I dont remember exactly how to do it, you may try googling it. I got mine off the sticker which was still on the inside of my wheels, but I also looked it up on the manufacturers website. What brand and series of wheels do you have?

Here is another pic with a 305/55. The trucks kind of dirty plus its a cell phone pic, but its the newest one I have since some upgrades...

2006 CCSB LBZ 4x4- Turbo-back 4 inch w/ 5inch tip, K&N intake, EFI Live DP5 by Diesel Addiction, EGR delete, TransGo Jr, Allison Deep Pan, Suncoast Filter Lock, MA Pump Rub Kit, Ipod Aux-in, Weathertech mats, All On Headlight mod, Tow Mirrors, Line-x, B&W Gooseneck hitch, Autometer Sport-comp II Boost and Pyro, 20% tint, Bilstein 5100's, Pacer NBS Smoked Cab lights, 20inch Eagle Alloys, 305-55-20 Trail Grapplers

Last edited by sifd4x4; 03-23-2011 at 10:58 PM.
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post #10 of 25 (permalink) Old 03-24-2011, 06:40 AM Thread Starter
D04
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i have some Ultras. they have about a 4in dish if i was guessing.

2008 black Sierra slt crew cab
Moto metal 962 wheels
Kory Willis tuned
Deleted
Transgo

03 black crew cab
single tow tune
straight pipe
130k miles
D04 is offline  
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