I keep checking different tire sources trying to determine what size tire I should use for replacement tires on my 04 Dodge Ram. The tires that are on it now are 275-60-20, but all the references I have found say that I should be putting 275-55-20 on my 04 Dodge Ram 1500 2x4. Will it really make a difference in performance. I have a few metal strands sticking out of my left front tire so I need to make a tire choice NLT Monday afternoon, so any help you can provide will be greatly appreciated.

Thanks,

Brian

 

There is only a 5% difference in the aspect ratio, the 60's are a little bigger, a little heavier.. If you like the ride keep with what is on the rim. If you haul a heavy trailer I would go with the 55's, less sway. otherwise, I like the ride of the taller tire.

 

u probably will not even notice difference

 

The 55 means the sidewall is 55% as tall as the 275MM width. The 60 has a 5% taller sidewall.

 

Here is how it works.

the first number 275 is the width of the tire in millimeters.

the second number 60 is the % of the width that is the height of the tire from the rim to the end of the tread.

the 3rd number is the rim size.

So:
275mm = 10.83" The width of the tire

60% or 10.83 = 6.5" you have to multiply that by 2, once for the top, once for the bottom
= 13"

Then add the rim size of 20.

13 + 20 = 33"

Now the new tires are 275/55R20

275mm = 10.83" width
55% of 10.83" = 5.95" * 2 = 11.9"
20" rim

11.9 + 20 = 31.9"

The R simply means Radial. If there are letters in front; P means Passenger vehicle and LT means Light Truck.

Hope this helps.

 

http://www.redrock4x4.com/tech/tire_...&method=metric This is a handy convertion calculator that changes from metric to standard and visa versa. It might help some. If the above don't show as a link just copy and paste it. I ain't figures out how to put links in yet.lol