Widest tire using stock 15x8 rallies

[mydads84]

H,all. I have a 1984 C10 long bed that I am going to lower the front 2-3"using cPPdrop spindles and then lower the rear with a belltech4"-5" shackle hanger drop kit.I will be using the stock 15x8 rallies .what is the widest tires I can run on the front and back without rubbing sorry if this has been covered somewhere else I searched and didn't find anything that fit my situation.

 

[mydads84]

More info....gonna run 3:73'swith a 700r4

 

[HotWheelsBurban]

More info....gonna run 3:73'swith a 700r4

We ran LR60/15 on the 78 Sierra shop truck, on 15x8 factory wagon wheels...back in the early 80s. I think that translates to a 255/70 now? Most tire stores would/should be able to help with this....

 

[bucket]

255/70 works well on a stock height truck. For lowered a little, a 275/60 is a simply wonderful fit.

 

[Grit dog]

H,all. I have a 1984 C10 long bed that I am going to lower the front 2-3"using cPPdrop spindles and then lower the rear with a belltech4"-5" shackle hanger drop kit.I will be using the stock 15x8 rallies .what is the widest tires I can run on the front and back without rubbing sorry if this has been covered somewhere else I searched and didn't find anything that fit my situation.

You actually left out one of the most important parts. Trans and gearing is irrelevant. However your desired tire height is a big part of the equation when deciding how wide will work on the rims, another consideration you didn’t ask and may not know.
As far as what will clear well with the lowering kit, there’s a bunch of folks who can help you dial that in. But you can fit a pretty fat (relatively) front tire without issue. Even lowered.

 

[mydads84]

You actually left out one of the most important parts. Trans and gearing is irrelevant. However your desired tire height is a big part of the equation when deciding how wide will work on the rims, another consideration you didn’t ask and may not know.
As far as what will clear well with the lowering kit, there’s a bunch of folks who can help you dial that in. But you can fit a pretty fat (relatively) front tire without issue. Even lowered.

700r4 with3:73's tire height I guess depends on what will clear

 

[mydads84]

700r4 with3:73's tire height I guess depends on what will clear

I guess I need some enlightenment lol!

 

[Scruffy49]

255/70 used to be known as 30-9.50r15. I test fit a set on an 85 swb with over 8” of rear drop, plenty of room. It likely could stuff a 31-10.5r15 with only 4-5” of rear drop. At stock height a skinny 33” tire fits with room to spare. I hate fenderwell gap, so…

 

[HotWheelsBurban]

255/70 used to be known as 30-9.50r15. I test fit a set on an 85 swb with over 8” of rear drop, plenty of room. It likely could stuff a 31-10.5r15 with only 4-5” of rear drop. At stock height a skinny 33” tire fits with room to spare. I hate fenderwell gap, so…

We had 30-9.50R15 Michelin TRX tires on the stock alloys on our first '99 C1500 Burb, on it when we got it. IIRC those are 7" wide wheels, and they fit fine. Apparently in the mid 2000s that was a common tire upgrade for those OBS Burbs because I saw a lot of them then.

 

[Grit dog]

255/70 used to be known as 30-9.50r15. I test fit a set on an 85 swb with over 8” of rear drop, plenty of room. It likely could stuff a 31-10.5r15 with only 4-5” of rear drop. At stock height a skinny 33” tire fits with room to spare. I hate fenderwell gap, so…

Say wut?

 

[Scruffy49]

Say wut?

I want -zero- excess wheelwell, grew up with Street Freaks and Pro Streets. The fattest tire I can fit with 8” of rear drop is an old Hercules Terra Trac 30-9.50r15.

 

[xm20k]

A 15x8 height is the worry not width. You can get a 305/50 20 under the rear of these, basically a 32x12.5 if your spacing is right.

Mine when it had the Nitto R2 drag radial under the rear. On a 20x10 with 5.75" BS

You must be registered for see images attach

It's now running a 15x10with 5.5 BS with an MT sportsman S/R 28x12-15

You must be registered for see images attach

How tall is the question width is good up to 12.5 with proper BS.

The front will be the end that may have an issue due to height. Mine with 2" springs and 2.5" spindles was really close to rubbing with a 20x8 255/45 in the front. If you plan on only running spindles up front anything 28 and under should be fine, any taller and it may hit the wheel opening in a turn.

Currently (second pic) it has a 17x4.5 with a 26x6 tire in the front to clear fenderwell headers. I had to put stock springs back in the front because the 2" smaller tire didn't leave me any room to get a jack under the crossmember if it ever had a flat or was on unlevel ground.

 

[Grit dog]

I want -zero- excess wheelwell, grew up with Street Freaks and Pro Streets. The fattest tire I can fit with 8” of rear drop is an old Hercules Terra Trac 30-9.50r15.

Still don’t get it. Why would you want to put a lowered truck on skinny high profile off road tires?

 

[Scruffy49]

Still don’t get it. Why would you want to put a lowered truck on skinny high profile off road tires?

For testing, work fine. Readily available in HT tread as well. Be it the 30-9.50, 31-10.5 or even 33-12.5 sizes.

 

[Scruffy49]

That is the rear tire I will be running on 15x8s. Truck has P235/75r15 AT on 15x6 in the pic. Too much fenderwell gap showing. Will have P215/70r15s on 15x6 up front. 2.5 or 3” drop spindle, cut springs, shock relocators, smaller bump stops. Might use rear spacers to center the tires up a bit in a rear view.

If you’re dropping a swb, ought as well “Faux Street” it. This particular truck being a carbed 4.3/Th400, it’s rather gutless.