265/50/15

[stoot]

Anybody running 265/50/15 or 275/50/15 on a 10 inch wheel with 5.5 backspacing ?

 

[AJ/FormS]

Not me
Is it even possible to put a 265 on a 10 and be able to get the beads out that far? IDK
I run 295/50s on 10s but to get the treads flat to the road. I have to run down at 24psi.
Ima thinkin a 275/60 would like the 10s.
275/50s might stretch out that far, but I ran them on 8.5s

I use an 85% rule, namely that the rim size should be about 85% of the branded size.
With that in mind,
a 265 needs a 8.9
a 275 needs a 9.2
a 295 needs a 9.9
round up or down to the nearest available size.

When you do this, the tread will wear nicely.
the manufactures uses a 70% rule that establishes the branded size. In other words a 275 on a 70% rim, which is 7.6 inches, rounds to 7.5, will have a 275 profile, +/- 5mm. That means it can actually measure anywhere in between 270 and 280 on that 7.5 rim.
The 70% rule does not mean that a 7.5 rim will provide optimum tread life for a 275
In my experience the 7.5 is actually too narrow for a 275, and the edges of the tires curl up off the road, and the centers burn off long before the edges do. So I might as well have installed a smaller tire in the first place.
But the 85% rule has been working fine for me for decades.

But this means your 275 is no longer a 275.
When mounted on an 8.5, the sidewalls will be pushed out about 1/2 of the difference in rim sizes. So if the 70% rule dictates a 7.5; and the 85% rule dictates a 9.2, then the difference is 1.8, so the size will grow about .9 inch or 23mm. Adding the 23 to 275 gets you 298mm ...... which can still be +/- 5mm. So you could be looking at from 293 to 302mm.
This is important to know if you have a car with drop-down quarters like a Dart or Early-A.

As an example,
By the 70% rule, my 295s call for a rimsize of 8.13 rounds to 8inches, which would make them 295 +/-5mm
By the 85% rule, it calls for a 9.87rim, rounds to 10inches .
By the math , the section is predicted to grow .87 inch or 22mm, making it a 317 +/-5mm ,which is 312 to 322.
By actual measurement, mine came in at 12.75, or 324mm at 24 psi

Happy hunting

 

[sccachallenger]

I wouldn't worry about 24 PSI, if the tire is wearing evenly you're good.

Now if you put five big guys in the car, and hook up a nose-heavy trailer, I'd add some air!

 

[AJ/FormS]

It took a while to get used to the way it cornered
and I removed the rear seat, and as long as I own it, I ain't reinstalling that 62 pound hummer

 

[famous bob]

Not me
Is it even possible to put a 265 on a 10 and be able to get the beads out that far? IDK
I run 295/50s on 10s but to get the treads flat to the road. I have to run down at 24psi.
Ima thinkin a 275/60 would like the 10s.
275/50s might stretch out that far, but I ran them on 8.5s

I use an 85% rule, namely that the rim size should be about 85% of the branded size.
With that in mind,
a 265 needs a 8.9
a 275 needs a 9.2
a 295 needs a 9.9
round up or down to the nearest available size.

When you do this, the tread will wear nicely.
the manufactures uses a 70% rule that establishes the branded size. In other words a 275 on a 70% rim, which is 7.6 inches, rounds to 7.5, will have a 275 profile, +/- 5mm. That means it can actually measure anywhere in between 270 and 280 on that 7.5 rim.
The 70% rule does not mean that a 7.5 rim will provide optimum tread life for a 275
In my experience the 7.5 is actually too narrow for a 275, and the edges of the tires curl up off the road, and the centers burn off long before the edges do. So I might as well have installed a smaller tire in the first place.
But the 85% rule has been working fine for me for decades.

But this means your 275 is no longer a 275.
When mounted on an 8.5, the sidewalls will be pushed out about 1/2 of the difference in rim sizes. So if the 70% rule dictates a 7.5; and the 85% rule dictates a 9.2, then the difference is 1.8, so the size will grow about .9 inch or 23mm. Adding the 23 to 275 gets you 298mm ...... which can still be +/- 5mm. So you could be looking at from 293 to 302mm.
This is important to know if you have a car with drop-down quarters like a Dart or Early-A.

As an example,
By the 70% rule, my 295s call for a rimsize of 8.13 rounds to 8inches, which would make them 295 +/-5mm
By the 85% rule, it calls for a 9.87rim, rounds to 10inches .
By the math , the section is predicted to grow .87 inch or 22mm, making it a 317 +/-5mm ,which is 312 to 322.
By actual measurement, mine came in at 12.75, or 324mm at 24 psi

Happy hunting

AS usual you way over thinking and spouting off about this .
Plus or minus 1'' works on about everything , no formulas , no b.s. involved !