Good Sam Club Open Roads Forum: Should I go back to OEM size tires?
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 > Should I go back to OEM size tires?

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twodownzero

NM

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Posted: 07/22/19 08:11am Link  |  Quote  |  Print  |  Notify Moderator

CapriRacer wrote:

2007 Suburban 2500's came with 6.5" width wheels. An LT265/75R16 requires a 7" wide wheel minimum. Using a narrow wheel tends to make the vehicle follow the ruts in the road and makes it sensitive to cross winds.


If true, that's certainly strange. Trucks came with 8" wide wheels even 30+ years ago when they came with 235mm tires. I agree that proper wheel width is a consideration I'd take into account.

blt2ski

Kirkland, Wa

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Posted: 07/22/19 09:45am Link  |  Quote  |  Print  |  Notify Moderator

twodownzero wrote:

CapriRacer wrote:

2007 Suburban 2500's came with 6.5" width wheels. An LT265/75R16 requires a 7" wide wheel minimum. Using a narrow wheel tends to make the vehicle follow the ruts in the road and makes it sensitive to cross winds.


If true, that's certainly strange. Trucks came with 8" wide wheels even 30+ years ago when they came with 235mm tires. I agree that proper wheel width is a consideration I'd take into account.


I had two SW 3500s, ran 265s on stock rims, did not like it vs a 7.5" rim. If one looks at tire load charts, you lose about 200 lb of capacity with narrower rims.

Marty


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BenK

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Posted: 07/22/19 06:17pm Link  |  Quote  |  Print  |  Notify Moderator

IMHO, GM has the 6.5" bead to bead rim width both because it is cheaper and for the higher ride quality

Ride quality, as the tire's sidewalls has more of a 'bend back', or whatever technical term is use to describe it

But, narrower rim, even withing the rim width range, will have the tire's bend back allow the rim/wheel to "roll over" more than with a wider rim

The tires slip angle also increases as the rim gets narrower on the recommended rim width. More if going narrower than recommended width range...and...the slip angle is less with wider rim width...but that is more for precision driving than towing

My Suburban came with LT245/75R16E's on 6.5" wide rims. They are okay for me, but consider myself not a normal driver

For normal drivers, the stock LT245/75R16E's will be fine on stock wheels


-Ben Picture of my rig
1996 GMC SLT Suburban 3/4 ton K3500/7.4L/4:1/+150Kmiles orig owner...
1980 Chevy Silverado C10/long bed/"BUILT" 5.7L/3:73/1 ton helper springs/+329Kmiles, bought it from dad...
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Grit dog

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Posted: 07/28/19 12:44am Link  |  Quote  |  Print  |  Notify Moderator

Every little bit helps. Won't notice much difference in power nor the nonsense about 265s not fitting right on 6.5" wide rims.

If you like the bigger tire look or want the additional load capacity, keep the 265s.
If you want every last bit of performance for the truck, stock, get the 245s. They'll be cheaper as well.


"Yes Sir, Oct 10 1888, Those poor school children froze to death in their tracks. They did not even find them until Spring. Especially hard hit were the ones who had to trek uphill to school both ways, with no shoes." -Bert A.

drsteve

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Posted: 07/28/19 09:07am Link  |  Quote  |  Print  |  Notify Moderator

I just went from 245/75s to 265/65s and I can definitely tell a difference. It changed the way the trans shifts on hills, and it doesn't hold top gear as easily.


2006 Silverado 1500HD Crew Cab 2WD 6.0L 3.73 8600 GVWR
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