Interchaning tire sizes?

The 235 is the width, 70 is the % of the width that makes up the sidewall height, and of course the last # is rim size.

I would check a tire shop. Going to wider and taller may catch inside the wheel well when you turn or rub when you hit a rut.

 

You can change tire sizes as long as you stay close to stock tires. With 255/70 you can easily run 245 to 265 with depth from 65 to 75. As Kstaven said it's if the wheel well has clearance to go more than that and also changing much more will skew the speedometer.

 

Try craigslist. We always buy used tires and save alot of money doing it. and we need big 10 ply truck tires for the duramax I picked up some studded snow tires for it with 85%+ tread for $150. New tires for it are always over $1000
Just look for even wear and make sure they are not to old even if they have good tread.

 

I think it's Discount Tire's website that will show you the available sizes for your vehicle. Could probably call a tire shop and ask what sizes are recommended for the truck.

We went up a size for my vehicle (Expedition). It was within the factory recommendation, not issues with rubbing or what not. Rides a bit higher, but I'm ok with that It also skewed the speedometer to run lower (so it says I'm doing 66, but I'm really doing 70).

 

The first number is the height of the tire, not the width. A 235 would be a shorter tire than say a 255. The middle number is the width, being a 60 would be much wider than a 75.

 

http://www.sears.com/shc/s/c_10153_12605_Automotive_Tires?i_cntr=1329658389740

their tire selector has a bunch oh choices for vehicle configurations.

 

Advice from my auto racing days; No problem! You can change tire widths within reason. We used to mount narrower tires in wet weather because a narrower tire is less susceptible to hydroplaning. Just make sure you have the car realigned since changing tire width will change that.

Used tires? No way on God's green earth.

1. You don't know their history. What kind of damage has been done to them?
2. How old are they? Tires do rot with age.
3. A visual inspection of an unmounted tire is completely worthless.
4. There is some reason that someone got rid of that used tire.

Remember, when riding in a car your life depends on a contact patch roughly the same size as a pocket handkerchief.

 

No kstaven has it right. The first number is the tire width. The second is the height off the rim. It is measured in a % of the width. Third is the rim size.


The first 2 only matter at to if they fit under the car but also effect speedometer error.