7.00-15LT vs P235/75R15 XL
Top asked me to join in on conversations about 7.00-15LTs particularly with regard to replacing those with P235/75R15 XLs. The threads he pointed me to were cluttered with other topics so I decided to start a new one.
Width: 8.0 (on a 5.5 rim)
Load Carrying Capacity : Load Range C: 1710# @ 45 psi (bias) / 50 psi (radial) Single (I am not going to quote duals)
Load Range D: 2040# @ 60/65
Load Range E: 2335# @ 75/80
Speed restriction: 65 mph
Width: 8.8 on a 6 rim (8.6 on a 5.5)
Load carrying capacity: 2183# @ 41 psi (1985# @ 41 psi when used on a trailer)
Speed Restriction: Varies by tire
My first reaction is that it is smaller in diameter, wider (a concern!), and for Load Range C - on paper - there is enough load carrying capacity. For Load Range D on paper there is a difference of 55# (the wrong way) - and here is where it gets complex.
Because of the difference in speed restriction, this weight difference is not a concern - FOR ME!!. It may be a concern for others and that is understandable.
Taking this a next step Load Range E: On paper, there is a 350# difference and I think this is just beyond the limit (adjusting for speed)
Lets look at an ST tire:
8.0 on a 5.5 rim
Load Carrying Capacity: Load Range B: 1480# @ 35 psi
Load Range C: 1820# @ 50 psi
Load Range D: 2150# @ 65 psi
Aside from the load carrying capacity and the reduction in diameter, this appears to be a viable option.
How about ST225/75R15?
8.8 on a 6 rim (8.6 on a 5.5 rim)
LR B: 1760# @ 35 psi
LR C: 2150# @ 50 psi
LR D: 2540# @ 65 psi
Aside from the width, this looks viable.
I want to take a moment to talk about clearances:
First, I am not a fan of tires contacting body parts, frames, and suspension members. Bad things have been known to happen.
Diameter: Thats pretty easy to deal with. The static clearance can easily be measured and there is an obvious limit before the suspension bottoms out.
Width; The static clearance can be measured, but under cornering, the issue becomes less clear. I am VERY nervous about width clearances, so I tend to emphasize staying close to the original dimension.
And those are my thoughts.