rear tires

[67lq4]

does anyone have anyinfo on fitting 29 or 31x 15 16 or 18/20 Mickey thompsons on a 67 c10 ..rear coil springs..currently droped 4/6 but willing to go up a little bit in order to fit the right rear tire..also i had a eaton locker 4.10 rear end right now. with a 6.0 LS and 4l80 tranny..i plan to add a single turbo in the future and wondering if with this tire sizes i will need to change rear end??

[PepperTreeGarage]

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[67lq4]

i thought someone had some advice HAHA

[siggyfreud]

You need to provide more info, like the full tire size, and wheel backspacing. If you're asking if a 31" tall tire will fit, then the answer is yes, but it will depend on placement and suspension height.

[67lq4]

i dont know backspacing...full tire size is there...i was asking for some advice on backspacing...im looking at running some raceline 20x14 wheels in back not sure on backspacing to make them fit yet??? tire size is 29 or 31x 15 16 or 18/20 Mickey thompsons od prefer to go with 31 if i can ft it to fit without any crazy mods.

[siggyfreud]

So 31" tall X 15" wide tires? When I measured my fleetside, with wider tubs, I had about 15" of total space (front and backspace) to fit something. 9.5" of that was backspace available, and 5.5" of that was frontspace.

When you're going that big I think, unfortunately, you're going to need to measure it out yourself because you're pushing right up against the limits, and I'd be really reticent to buy anything without measuring it out.

I know a 15" wide would be pushing it close on my setup, and again, I have wider tubs. Do you have stock tubs on yours?

[67lq4]

i have stock tubs for now...i work in alaska up on a fishing boat so thiis is when i get all my ideas then i go home and do them haha ive already got an extra set of tubs sitting in my garage im going to cut and weld to mine to get them wide enough. i thought about buying some of the aftermarket wider tubs but i think i can widen these all the way to the frame and be more then good.

[67lq4]

i want to run 255/40/20 in front so im kind of leaning towards a rear tire that is 29x15r20. since 255/40/20 is 28" i think 31 might look too tall on back and 29" will be about perfect?

[siggyfreud]

If the frame becomes your inner barrier then you should be able to fit 15" wide okay, but again, measure first .

Just keep in mind that this will limit future suspension changes, as you'll need to run anything you do inboard of the frame. Most aftermarket setups run outboard (though I think Ridetech is inboard). May not be a concern for you, but just a heads up.

As far as what backspacing to run, you'll have to measure from your wheel mounting surface on the rotor to the outer most point a wheel will fit, which for me I chose to use the inside lip of the rear fender, a few inches up. So let's say for you that's also 5.5", and you want to run a 14" wheel. Remember, wheel measurements are also from inner lip to inner lip, so a 14" wheel is actually going to be 15" wide.

So 15" - 5.5" = 9.5", meaning you'd want a 9.5" backspacing on that wheel to be inside the wheel well.

[67lq4]

well i think i have decided on the 31x18r20 because it has a 34mm side wall versus a 30mm side wall on the 29x15r20..now to get them to fit under there without getting too crazy.