Came across some new 31x13.5x15s for cheap and was wondering what backspacing I would need. I have a 3.5-4 inch lift right now and plan on trimming the fenders a little bit. Let me know what you experts think.

 

Also what sizerim is best to run with those tires? 15x8 or 15x10?

 

bump anybody?

 

for a 13.5 i tihnk a 15x10 is a must

 

one of my spares is a 13.5 and it is on a 8in rim. tire shop cussed me up and down for it.(little hard to get on, and its a mudzilla which are know for being nasty to get on)

 

Tire trouble...I run 35x12.5 on a 10.5 rim and 3.5 bs. the diffrence between a 8.5 or a 10.5 will make the tire either taller with a more narrow foot print (8.5) or squat with a wider foot print (10.5) at standard psi. until you air down if you do air down you will need to monitor the tire bead very carefully on a 8.5 rim it will be prone to pop off. and back spacing for that wide of a tire i would go with about 3.5 to 3.75 there going to stick out like a ***** but they wont rub.

Steve

 

Im running 33x13.5's on 8" rims. Its fine...

 

its supose to be mounted on 13.5 inch rims not 8 or 10.... 10 would be the bare min i would use..

 

Are you serious?!?! I run 33x12.50's on a 15x8 and it's perfect. One extra inch of tire width is not going to make much of a difference.

 

Steve. To my understanding a wide tire on a narrower rim makes the tire stay on the bead better exspecially when aired down

 

does anybody have any pics of a 31x13.5 tire? i cant seem to find any

 

Please exsplain to me then what 13.5 stands for ?

 

13.5 is how wide the tires are. I'm runnin 33 12.5 on 8's

 

How wide they are at the tread, not at the beads.

 

ah right because beads pop inward ok you win. but just the same Ive got a buddy running the same size tire with a more narrow rim and it would appear to be taller and more narrow.