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Discussion Starter · #1 · (Edited)
Hello all, I've been looking around for a while and I've decided that I would like to get some 33" Micky Thompson Baja MTZ tires for my new Titan. I would like to put them on 16" rims. My truck is stock. I would like to get the 285/75R16 which is 33X11.5. My truck is a 2004 4X4. Can you help me out with deciding what offset/backspace I will need on my rims in order for these tires to fit properly? Thanks guys.
 

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Needs 17s minimum. There have been a couple of people with 16s, but they had to grind their brake calipers down. Oh, and 18s minimum for the '08 Titans ... bigger brakes.

The MTZ for this size, 33X12.50R17LT 114Q D, [about 32.8"x12" wide on a 8.5" wide rim]. They are 63 lbs., have a 2,600 load capacity when inflated to 50 psi., best with an 8.5" wide rim as that's their minimum approved width.

The MTZ in this size, only has a 2-ply sidewall, so I'd probably stick to their approved minimum rim width. If it was a 3-ply, a slightly smaller rim width isn't as likely to cause tire sidewall flex.

Consider the 3-ply sidewall, BFG MT KM2 in the T305/65R17/E 121/118Q, (32.8"x12" on an 8.5" width rim), with a 3195 lb.s capacity at 65 psi. This tire is a 67 pounder.

Probably a better match, since you're not leveled, would be the BFG MT KM2 285/70QR17 121/118Q D [33"x11.5" on an 8.5" width rim, and 11.1" wide on a 7.5" width rim], ... approved for as narrow as the stock Off Road, and XE 17x7.5" width rims. This 60 pounder, has a 3195 lbs. capacity at 65 psi.
Link to Tire Rack's overview and pics of the KM2

Rim Backspacing and offset, (diameter of wheel doesn't matter for backspacing calculations).
  • A 7.5" stock rim the backspacing is 5.375" with +30mm offset. [Best range +25mm to +38mm]
  • For an 8" width rim target 5.5" backspacing, +25mm offset. [Best range +18mm to +30mm]
  • And for an 8.5" width rim target 5.5" backspacing, +18mm offset. [Best range +12mm to +25mm]
 

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Discussion Starter · #3 ·
This is a very informative reply thank you. I'll try to get back here and let you know how I make out in case anyone is wondering. Thanks ,

Andrew
 

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NorCal,

Can you extend your Rim Backspacing and offset chart to include 9" 9.5" and 10" wide wheels.

Thanks!!!
 

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QUADS said:
NorCal,

Can you extend your Rim Backspacing and offset chart to include 9" 9.5" and 10" wide wheels.

Thanks!!!
Here you go QUADS,

Note: The "Best range" will keep the backspacing between about 5.25" to 5.75". This doesn't guarantee no rubbing at the pinch weld, at full steering lock, (or close to it), especially with rims wider than stock rims. I would never want to run more than an 8.5" width rim, and my absolute maximum would be a 9".

Also, 5.75" backspacing is closer to the steering knuckle/spindle than the stock 5.5" backspacing, so 5.75" would not be a good backspacing for the CST lift kits, since even the stock 5.5" backspacing can have some 35s rub ... PRG states "such as 325 tires or Toyo/Nitto MT...the lugs will hit the spindle".

  • 7.5" stock rim the backspacing is 5.375" with +30mm offset. [Best range +25mm to +38mm]
  • 8" width rim target 5.5" backspacing, +25mm offset. [Best range +18mm to +30mm]
  • 8.5" width rim target 5.5" backspacing, +18mm offset. [Best range +12mm to +25mm]
  • 9" width rim target 5.5" backspacing, +12mm offset. [Best range +6mm to +18mm]
  • 9.5" width rim target 5.5" backspacing, +6mm offset. [Best range 0mm to 12mm]
  • 10" width rim target 5.5" backspacing, 0mm offset. [Best range -6 mm to +6mm]
 

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Thank You!!! I needed this info before I made a $1000+ mistake
 
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