Dropping Wheels from 22 to 17... Need Offset Help

[EricStanley]

Currently running 38x13.5/22 on a 22x12 4.77" backspacing and -44 offset with a 4.5" Metalcloak lift, Fab 4 fenders, etc.

Considering 38x13.5/17 on 17x9, 4.5" backspacing, -12mm offset.


The goals as I see it are as follows:
-Reduce rotational weight (this is a daily driver in addition to its other obvious uses) - the above combo saves a little over 31lbs/corner - about 22% reduction.
-Increase sidewall height (but maintain overall height - though I'm a tad flexible on that) -
-keep current lateral placement as it relates to the inside lip of the wheel/tire
-improve look (very low priority here, but at a minimum try not to make it uglier)

I'm not overly concerned with where the outside of the tire lands in relation to the fender. It sticks out a lot now and I don't really care. I'm more concerned with not moving the inside lip/sidewall any more inboard than absolutely necesarry. I don't have great pictures to show this, but at full tuck the rears are VERY close to rubbing. Up front, there is full rubbing happening if I'm turned enough (hell, there's rubbing keeping it straight).

If I'm doing my napkin cad math right (and that's highly unlikely at this hour), I'm going to need to add 1.25" spacers to keep the inside tire wall at its current position... is that right... or close to right?

Sponsored

 

[3VOLVE]

Recommend plugging your numbers into https://tiresize.com/wheel-offset-calculator/ to give you an idea of where your inner sidewall is.

 

[EricStanley]

Recommend plugging your numbers into https://tiresize.com/wheel-offset-calculator/ to give you an idea of where your inner sidewall is.

Awesome. Thank you!

 

[Dougstdig]

Just off from your perimeter request…

I’m running 37x12.5R17 with a 8.5x17 -6mm wheel. Yesterday I went on an engineered course where I purposely stuffed the outside front tire wheel into high side of Burns while turning extremely sharp with it being gladiator to make it around corners I had zero rubbing and these are on a 2 1/2 inch left.

These bead locks are 29lbs further reducing weight on a more true to height heavy tire.

 

[ross neill]

More negative spacing will increase poke reduce rubbing if you know someone with Jeep rims and large tires see how there fit I would think you need same offset -44

 

[Dougstdig]

If you’re set on running 38 x 13.50, I would look at Matt with Ozark over landing on YouTube. He has a zero rub and wheels at all over the place. I believe he’s running vision wheels and a 17 x 9.

I believe these are the whales he’s running and they are -12.

https://tiresize.com/wheel-offset-calculator/

 

[JT1]

If you’re set on running 38 x 13.50, I would look at Matt with Ozark over landing on YouTube. He has a zero rub and wheels at all over the place. I believe he’s running vision wheels and a 17 x 9.

I believe these are the whales he’s running and they are -12.

https://tiresize.com/wheel-offset-calculator/

That wheel calculator stinks, it doesn't take width into play. The wheels the OP is running are 12" wide, -44. The new ones are only 9" wide and -12. He has the backspace listed in the original post. He will have a 1/4" more room to the suspension than the 22x12s he's currently running.

Sponsored