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Re: 30x9.5x15
Dino #777523 June 12th 2021 2:03 pm
Joined: Jul 2014
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Uncle Rust N Dents
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Uncle 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).


[Linked Image from farm3.staticflickr.com]
Re: 30x9.5x15
Dino #777543 June 12th 2021 5:09 pm
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Dino Offline OP
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[Linked Image]Wheel-Size.com it looks up ur factory wheel and then u put in other sizes to compare,,,
These are what I got today for $80 for 4.... 16x8 4.5 back space 0 offset
So 70's will be ok?


1995 G2500 350tpi
16" wheels 245/70/16
KYB mono max all 4
Airlift rear
Re: 30x9.5x15
Dino #777544 June 12th 2021 5:16 pm
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I put in 16x8 and 255 16 8 and checked the revs and it's 661 Stock is 699 Revs and 30" might rub,,,, want to get as close as possible .245 16 8 is 684 revs and 29.5"


1995 G2500 350tpi
16" wheels 245/70/16
KYB mono max all 4
Airlift rear
Re: 30x9.5x15
Dino #777546 June 12th 2021 5:31 pm
Joined: Jun 2010
Posts: 18,286
Likes: 558
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Posts: 18,286
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I have 245 75 16 on my G30 no rubbing


[Linked Image from live.staticflickr.com]


SUNSHINE VANS-VAN DIEGO
ADRENALIN BY THE GALLON & CHASIN RACIN
ONE FOR THE DIRT & ONE FOR THE STREETS
'93 CHEVY G30 454 4X4 SPORTVAN EXT 146" WB
'92 CHEVY G30 454 BEAUVILLE EXT 146" WB
Re: 30x9.5x15
Dino #777569 June 13th 2021 12:34 pm
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Dino Offline OP
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245 75 16 that's 30.5 " tire,,,,,,I'm just wondering now that I got these Baja 16's if 70's will not be too narrow,,,really want 235 70 16 or 245 70 16,,,people may not mount them for me.
May go staggered 255 70 16 rear 235 70 16 front,,,,these wheels are huge to me.....mounted up front wheel w/o tire and they are close to everything but seems to be ok,,,,hub rings coming of course 83-78.1
Bottom line what's smallest tire you would run on 16x8???? for front only of course....
Frscke1 those are on 8" ?


1995 G2500 350tpi
16" wheels 245/70/16
KYB mono max all 4
Airlift rear
Re: 30x9.5x15
Dino #777572 June 13th 2021 1:55 pm
Joined: Jun 2010
Posts: 18,286
Likes: 558
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Posts: 18,286
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SUNSHINE VANS-VAN DIEGO
ADRENALIN BY THE GALLON & CHASIN RACIN
ONE FOR THE DIRT & ONE FOR THE STREETS
'93 CHEVY G30 454 4X4 SPORTVAN EXT 146" WB
'92 CHEVY G30 454 BEAUVILLE EXT 146" WB
Re: 30x9.5x15
Dino #777577 June 13th 2021 9:01 pm
Joined: Jan 2021
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I should just wait for 7" Rallys ,,,these 8" rims are giving me fits,,,I'm cleaning them up so I know I can get my $ out of them....still thinkin'


1995 G2500 350tpi
16" wheels 245/70/16
KYB mono max all 4
Airlift rear
Re: 30x9.5x15
Dino #777584 June 13th 2021 11:26 pm
Joined: Jun 2010
Posts: 18,286
Likes: 558
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Those 8" rims probly are for a 10"wide tire .... put a wider or thinner tire on a rim and the bead wont lock up right and you risk losin a tire goin around a corner.


SUNSHINE VANS-VAN DIEGO
ADRENALIN BY THE GALLON & CHASIN RACIN
ONE FOR THE DIRT & ONE FOR THE STREETS
'93 CHEVY G30 454 4X4 SPORTVAN EXT 146" WB
'92 CHEVY G30 454 BEAUVILLE EXT 146" WB
Re: 30x9.5x15
Dino #777607 June 14th 2021 9:29 am
Joined: Aug 2005
Posts: 21,211
Likes: 25
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Supreme Master
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From a personal note...on my 93 G20 I'm running 255-70-15 on all four corners on an 8" Rally wheel. No rubbing in the back, BUT on the front I have to be careful hitting dips in the road or going over speed bumps because the outer wall of the tire will slight rub on the inner lip of the wheel wheel. As with most vans the front track is wider than the rear track.

I just go slow and I don't have any issues.


Nate Breece
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