285's fit in stock location?

[HB 4X4]

Alright guys, as the majority of you know I just put 285/70/17 Nitto Terra Grapplers on my truck. I went in today to have them mount my spare, and they were able to fit it under the truck... I found it odd since it's not supposed to fit.

It clears the exhaust by about 1/4 of an inch but it touches the bar that runs parallel with the rear axle. What does this bar do? Is it bad that the tire contacts it? I have heard it mentioned by members of this board, Chris mainly, that this bar is the limiting factor in why 285's don't fit; will the contact between the 2 cause any damage to the spare?

(I think it's called the panhard bar but I am unsure.)

 

[Mike07SE]

The panhard bar keeps your axle centered. It is constantly moving with your axle. It would be bad to have this in constant contact with your spare.

 

[Trdsupranick]

Can we see some pictures of your new shoes on your rig here!!??

I am looking for some new tires and wheels soon!

Thanks

 

[RonMAIDEN]

Technically a 285 will fit but yes,the tire shouldn't touch any moving parts underneath hence why it shouldn't be placed underneath.

 

[CJ3Flyr]

If it were me and I was going to tolerate 'light contact' with the panhard bar I'd consider taking the TPMS out of the spare and build the crazy PVC thing the guy at T120 did. I'd then run the spare at zero pressure (and carry a compressor, obviously).

The bar is pretty stout and a deflated tire would 'give' pretty well during chassis/suspension flexing. That setup would probably let you run safely and carry the 285 underneath.

Lastly I might smear some swaybar grease on the bar to aid in reducing friction between the tire and the bar.

That's totally an IMHO but I'd do that on my own vehicle if I had the 285's and your cool exhaust.

:cheers:

 

[HB 4X4]

If it were me and I was going to tolerate 'light contact' with the panhard bar I'd consider taking the TPMS out of the spare and build the crazy PVC thing the guy at T120 did. I'd then run the spare at zero pressure (and carry a compressor, obviously).

The bar is pretty stout and a deflated tire would 'give' pretty well during chassis/suspension flexing. That setup would probably let you run safely and carry the 285 underneath.

Lastly I might smear some swaybar grease on the bar to aid in reducing friction between the tire and the bar.

That's totally an IMHO but I'd do that on my own vehicle if I had the 285's and your cool exhaust.

:cheers:

Thanks. I am going to look at it today, since I had to go in on Valentines Day and didn't want to get dirty so I let the guy who worked there be the one on his back. I'll see how much it's rubbing. I do carry a compressor so that's not totally out of the question.

Can we see some pictures of your new shoes on your rig here!!??

I am looking for some new tires and wheels soon!

Thanks

I put it up a while ago. The link is in my signature.

 

[HB 4X4]

It's actually not touching the bar, the guy didn't look close enough. I can fit a few $$ bills through the space, but it's literally clearing it by the hairs on the tire. I don't have anywhere around here to get good flex, but with one back wheel on a decent sized speed bump, it still clears it by the same amount. I am going to order the heat tape to wrap the exhaust a little though since it's close. Even with the tape I don't want it touching the exhaust since air is the best insulator.

Would you guys say this could be fine for a while? Then when the tires get rotated, and as the other tires become more worn, the gap will increase?

Exhaust (Passenger side):

Drivers side clearance:

 

[CJ3Flyr]

Your plan sounds good.

A near miss is always better than a light rub I'd still consider running the spare without air. It's too bad that opens up such a can of worms with TPMS.

The idea of wrapping the pipe is a good one IMHO.


:cheers:

 

[HB 4X4]

Your plan sounds good.

A near miss is always better than a light rub I'd still consider running the spare without air. It's too bad that opens up such a can of worms with TPMS.

The idea of wrapping the pipe is a good one IMHO.


:cheers:

Yeah, and I will be going to Big Bear tomorrow (hopefully) so I'll be able to see how it does with some flex, and make sure that the exhaust doesn't melt the tire. :bigok:

I think that on longer trips where the exhaust will heat up the most, the air flowing between them will be enough to prevent any melting.

 

[CJ3Flyr]

Yeah, and I will be going to Big Bear tomorrow (hopefully) so I'll be able to see how it does with some flex, and make sure that the exhaust doesn't melt the tire. :bigok:

I think that on longer trips where the exhaust will heat up the most, the air flowing between them will be enough to prevent any melting.

This is super cheeseball but until you wrap the exhaust use some duct tape to tape some aluminum foil to the tire (shiny side towards exhaust pipe). That'll keep it cool and should stay on for a few days.

:cheers:

 

[HB 4X4]

This is super cheeseball but until you wrap the exhaust use some duct tape to tape some aluminum foil to the tire (shiny side towards exhaust pipe). That'll keep it cool and should stay on for a few days.

:cheers:

Haha, alright. I'll go do that in a little bit.

I just ordered the exhaust heat wrap and the metal fasteners to secure it. It's coming out of San Diego so it should be here within a few days after it gets into the mail system.

 

[Thai]

Josh, your spare tire and the panhard bar are probably too close for comfort, esp. if you take it off-roading over rough terrain...even with a worn 285 tire. Not a good thing. You need to find another spare tire option....

 

[paraordnance]

are you guys mounting 285/70/17 on stock 17" rim? I know OEM size is like 265/70/17, but I would like to go slightly bigger. May be 275/70/17 at the most. Are wheels wide enough to take extra 10 mm? I been told by tire shop that they dont like mounting anything wider than recommended size on factory rims

 

[rook]

are you guys mounting 285/70/17 on stock 17" rim? I know OEM size is like 265/70/17, but I would like to go slightly bigger. May be 275/70/17 at the most. Are wheels wide enough to take extra 10 mm? I been told by tire shop that they dont like mounting anything wider than recommended size on factory rims

Each tire manufacturer publishes an approved rim width range for each size tire it makes. 285-295/70/17 are the largest sizes I've seen able to be mounted to a stock 7.5" wide wheel.

 

[HB 4X4]

Each tire manufacturer publishes an approved rim width range for each size tire it makes. 285-295/70/17 are the largest sizes I've seen able to be mounted to a stock 7.5" wide wheel.

X2

The 285's on 17" rims are recommended for 7.5-9.5 so you're safe with the 7.5".

 

[ProMed]

Here is a 275/65R18 Cooper STT spare: