Biggest tire on OBS DRW w/o spacer?

Got Smoke? · Jun 30, 2013

What's the biggest tire you can fit on a OBS dually without the bolt on style spacers? Can a 235/85 fit with a slide on spacer? Truck may be put into work hot shot hauling cars with a heavy triple axle trailer, would like to go to a slightly bigger tire to reduce my RPM's a little but don't want them to touch obviously.

Truck currently has 215/85R16's

OldschoolPSD · Jun 30, 2013

I ran 235/85's on my welding truck with a 1/4" spacer.

Patrick Feeley · Jun 30, 2013

I ran 235/85-16E' on my 94 without any spacers. I didn't have any issues when towing my 9k 5th-wheel, but if you're towing bigger, you might want a spacer. Not that the wheels are hub-centric and not lug-centric and the dually hub does not have much shoulder left on the hub for the outer wheel to center on. Almost any spacer will need to have a provision to keep the wheel centered. Cheers!

always-strokin · Jul 1, 2013

I've got 315's and have no spacer (yet). Dont need a spacer due to lift, you need a spacer due to how wide the tires are. 285's wouldn't need a spacer and will prob fit on stock lift I'm pretty sure.

Bare in mind that unless you get custom tuning going w/ bigger tires will hurt you a bit w/ the auto in terms of power off the line. I ran my 35's on stock tuning and it was a slug off the line, but w/ the 4.10's I could carry a 5-10k load in the hills at 90mph w/ ease. Tuning + the 35's = I have absolutely zero issues moving off the line w/ a 10k lb load.

Patrick Feeley · Jul 1, 2013

285's on an OBS dually? No way they would fit on mine! 235's didn't rub together, but anything larger probably would when towing. Cheers!

always-strokin · Jul 1, 2013

Ouch NO not on a dually, I apologize.

Got Smoke? · Jul 2, 2013

always-strokin said:
Ouch NO not on a dually, I apologize.

Yup lol 2wd 5spd dually...was hoping to hear I could get 235-85s to fit.

Sent from the command position of my dinosaur.

Got Smoke? · Jul 2, 2013

Patrick Feeley said:
I ran 235/85-16E' on my 94 without any spacers. I didn't have any issues when towing my 9k 5th-wheel, but if you're towing bigger, you might want a spacer. Not that the wheels are hub-centric and not lug-centric and the dually hub does not have much shoulder left on the hub for the outer wheel to center on. Almost any spacer will need to have a provision to keep the wheel centered. Cheers!

Hopefully it'll only need a 1/4" spacer like oldschoolpsd said. I saw a set of 235-85s on a friends OBS dually the other day and they looked good, but heavy towing would make them touch.

Sent from the command position of my dinosaur.

OldschoolPSD · Jul 2, 2013

Mine had 235/85 toyo mt's on it and the sidewalls barely touched with around 2k on the deck and 45lbs in the tires. I think if you went with a street tread and left them pumped up hard you might get away with it. A 1/4" spacer leaves you with a little more than a full nut on the wheels studs.

Got Smoke? · Jul 2, 2013

OldschoolPSD said:
Mine had 235/85 toyo mt's on it and the sidewalls barely touched with around 2k on the deck and 45lbs in the tires. I think if you went with a street tread and left them pumped up hard you might get away with it. A 1/4" spacer leaves you with a little more than a full nut on the wheels studs.

Would definitely be hwy treads at 80psi lol

Sent from the command position of my dinosaur.

Got Smoke? · Jul 3, 2013

got a quote from Discount Tire today for Four 235/85/16 BFG Commerical T/A's & Michelin XLT M&S's....:shocked::shocked::shocked::shocked:

BFG's were like $950 M&B with Road Hazzard replacement

Michelin's were $1,150 M&B with Road Hazzard replacement

Anybody have any experience with the BFG Commercial T/As?