The 1947 - Present Chevrolet & GMC Truck Message Board Network - View Single Post - Wheel size (offset) on a lowered '68 C20 ??

**KevinK7** · 03-28-2018, 05:52 PM

Just want to run this past the experts to see if I'm on track with regard to wheel offset for my planned setup.

The truck: '68 C20 Utility bed (396 BB, 4sp)

Lowering: I plan on going with Performance Online (POL) 2 1/2" front (8-lug) drop spindles (with Disc brake conversion) along with 4" drop coils in the rear (hence 2.5/4 drop).

Wheels: I plan to go with with 17x8" ('05 OEM Dodge) aluminum wheels with a 5.7" backspace (8"/2 + 1.7" offset=5.7 BS).

Since factory BS was I think 4.5"(16x6.5 wheels), I believe I will need to make-up 1.2" hence thinking I might need to ADD about 1" spacers.
POL notes that the (disc) spindles bring the front wheels out 3/4" (0.75").

Based on the above, what is your take on my need for spacers up front/rear?
I am thinking I might be OK up front with no spacers, but need to add (1"?) spacers in the rear (to line up with the fronts)?

As for...
Tires: Going to go with whatever fills the wheelwells best with the lowering and wheels above. Thinking in the range of
275-55-17 (6.0SideWall 10.8Width 28.9Dia) or
275/60-17 (6.5SideWall 10.8Wide 30Dia)

Note: The truck will otherwise maintain complete stock (C20) equipment. With the exception of course of whatever is necessary to update with the lowering (ie. shock relocation brackets, adj. panhard, etc)

03-28-2018, 05:52 PM	#1
KevinK7 Senior Member Join Date: Oct 2017 Location: Hudson Valley, New York Posts: 658	Wheel size (offset) on a lowered '68 C20 ?? Just want to run this past the experts to see if I'm on track with regard to wheel offset for my planned setup. The truck: '68 C20 Utility bed (396 BB, 4sp) Lowering: I plan on going with Performance Online (POL) 2 1/2" front (8-lug) drop spindles (with Disc brake conversion) along with 4" drop coils in the rear (hence 2.5/4 drop). Wheels: I plan to go with with 17x8" ('05 OEM Dodge) aluminum wheels with a 5.7" backspace (8"/2 + 1.7" offset=5.7 BS). Since factory BS was I think 4.5"(16x6.5 wheels), I believe I will need to make-up 1.2" hence thinking I might need to ADD about 1" spacers. POL notes that the (disc) spindles bring the front wheels out 3/4" (0.75"). Based on the above, what is your take on my need for spacers up front/rear? I am thinking I might be OK up front with no spacers, but need to add (1"?) spacers in the rear (to line up with the fronts)? As for... Tires: Going to go with whatever fills the wheelwells best with the lowering and wheels above. Thinking in the range of 275-55-17 (6.0SideWall 10.8Width 28.9Dia) or 275/60-17 (6.5SideWall 10.8Wide 30Dia) Note: The truck will otherwise maintain complete stock (C20) equipment. With the exception of course of whatever is necessary to update with the lowering (ie. shock relocation brackets, adj. panhard, etc)