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30x9.5x15
#777206 June 07th 2021 10:58 am
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Will I have trouble in front with 30x9.5x15 on '95 G20 on 7" factory wheel? Found a new set very cheap Cooper Discovery A/T3. Running 235 75 15 now.

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Re: 30x9.5x15
Dino #777207 June 07th 2021 1:57 pm
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Sharp G20 Dino. The Factory wheel will be fine. I'd measure overall diameter of both tires, turn wheels lock to lock with current setup, and measure for clearace . See whatcha got. A 235 is small. I say it fits. You can always airbag it. grinBe nice if you could air one or two up and try it.

Re: 30x9.5x15
Dino #777412 June 10th 2021 12:40 pm
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Notice no rear sag,,,,I put AirLift bags in rear with all new shocks what a difference,,,,seeing lots of 16's out there I guess that's more common then 15's...may go with 16's and use 255 70 16 same revs or 245 little wider,,,seen these too, love Ralleys but none local,,,,these Rallys are 4 hours away 15x7 would go with 30 " or 255 on Rallys

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Re: 30x9.5x15
Dino #777417 June 10th 2021 1:19 pm
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Rust N Dents
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A lot of '90s and early 2000s vehicles have 16" wheels, so they're not as odd-ball as they may seem, but they're nowhere near as common as 15s.


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Re: 30x9.5x15
Dino #777418 June 10th 2021 3:22 pm
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I use Tire Calculator online to see dimensions it really helps...I hear ya Rusty,,,I check Craigs list and market place daily still looking for something I like,,,what are ur thoughts on spacer just on rear?

Re: 30x9.5x15
Dino #777419 June 10th 2021 6:07 pm
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Rust N Dents
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I've never used spacers on anything I've ever owned (I've had 60 some-odd cars), so I couldn't tell you anything about any personal experience.
I also don't have any friends to ask about it either, as none of them run any spacers.

From a physics standpoint...
They push the wheel away from the hub, so the forces on the hub and bearings change...
They add a piece between the wheel and the hub, so there's another possible failure point...
They bolt to the hub/drum, then the wheel bolts to the spacer. That's ten bolt/lug torque instances per wheel.

I've heard people claim that they've run spacers for years with no issues.
I've also heard people claim that they've lost a wheel, and I've seen many pictures online of spacer setups that have come apart (who knows if any of those were installed properly).

I'm probably the worst one to ask about spacers, but you asked my thoughts, so there you are.
lol


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Re: 30x9.5x15
Dino #777424 June 10th 2021 6:52 pm
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Thanks,,,,you know how the rear is stuck in further then the front,,,not a big deal best not to mess with it...
Going to look at these tomorrow 16x8 American 8 hole wheels,,,,not holes for caps. How would I mount caps on them? They sell GMC caps with or without holes for mounting?????Does the lug nut hold them on?
I can go with after market American caps but rather have GMC. Only asking $100 for all 4

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Re: 30x9.5x15
Dino #777492 June 12th 2021 12:01 am
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Rust N Dents
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On a lot of those type wheels, the center cap pushes in from the back and has a little lip on it to hold it in place.
You'd just have to measure and get the right size center cap.


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Re: 30x9.5x15
Dino #777510 June 12th 2021 8:41 am
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Thanks,,,really like the GMC or Chevy 5 hole caps,,,,,
Tell me if 255 70 16 ok on 8' wheels are ok tire calculator looks like too narrow and says to use 255 65 but damn that's a expensive tire hard to find tire,,,,rather get 255 70 245 or 235
So I guess 70 or 65? Walmart has Roll Back on Cooper 245 70 16 $90 each, other wise same tire 255 65 16 $150 and up each

Re: 30x9.5x15
Dino #777523 June 12th 2021 2:03 pm
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Rust N Dents
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What tire calculator are you using that says a 255mm wide tire is too narrow for an 8" wheel?
Most of the ones I've seen say it's on the too wide side, with 245 being the upper limit from a handling standpoint.
Wider tires will fit but are not generally recommended.

Just so we're on the same page...
The first number of the tire size is the tread width in millimeters.

The 70 and 65 in the tire size are the height from the wheel to the tread.
It refers to the height of the tire in relation to the width (aspect ratio) and is listed as a percentage.

So, both a 255 70/16 and a 255 65/16 are the same width, with the 255 70/16 being taller (by 5% of 255mm or 12.75mm).


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