Test fitting for 18x11-315/30 combo - The 1947 - Present Chevrolet & GMC Truck Message Board Network

68Stepbed · 01-08-2018, 11:24 AM

Since the install of the TCI Engineering suspension, I have room for for a wider wheel/tire combo. The popular consensus for ultimate autocrossing is 18x11 wheels with 315/30/18 tires. The biggest hurdle is figuring out backspacing. I have plenty of room up front(at least with no inner fenders), but in the back is the tricky part. The stepsides have a slightly more narrow fender lip to fender lip measurement than fleetsides. Then, there's the issue of the shock placement limiting how deep the backspacing can go.

The final numbers are 6.75" backspacing or roughly a +20 offset. I can actually use this on all four corners and rotate them.

Ekliptix · 01-08-2018, 01:14 PM

I have nothing useful to add but I want to say that looks super badass with those massive tires up front and behind.

01-08-2018, 11:24 AM	#1
68Stepbed Registered User Join Date: Mar 2005 Location: 10-Uh-See Posts: 5,609	Test fitting for 18x11-315/30 combo Since the install of the TCI Engineering suspension, I have room for for a wider wheel/tire combo. The popular consensus for ultimate autocrossing is 18x11 wheels with 315/30/18 tires. The biggest hurdle is figuring out backspacing. I have plenty of room up front(at least with no inner fenders), but in the back is the tricky part. The stepsides have a slightly more narrow fender lip to fender lip measurement than fleetsides. Then, there's the issue of the shock placement limiting how deep the backspacing can go. The final numbers are 6.75" backspacing or roughly a +20 offset. I can actually use this on all four corners and rotate them. Attached Images __________________ Matt 68 C10 stepside, LS1/700R4, TCI Engineering suspension system

01-08-2018, 01:14 PM	#2
Ekliptix Registered User Join Date: Aug 2013 Location: Calgary, Alberta Posts: 677	Re: Test fitting for 18x11-315/30 combo I have nothing useful to add but I want to say that looks super badass with those massive tires up front and behind. __________________ 1972 Cheyenne Super SWB PS, PB, Tach, A/C, Tilt. Drivetrain: Built 402BB, TCI Streetfighter 700R4, 2,500 stall, Eaton posi, 3.73. Suspension/Chassis: ECE 4.5/6.5 drop, CPP nitrogen shocks, CPP front and rear sway bar, CPP cross members. Exhaust: 3" exhaust with x-pipe, Spintech 3000 mufflers, Hooker ceramic coated headers. Best 1/4 mile time: TBD.



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