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Discussion Starter #1
Have new 06 monroe gmc with 500miles on it. It came with goodyear 225 r70 19.5s. Does anyone have any experience with the michilen 245r70 19.5s ? It is the regional tread, I know my dealer will have to re program the computer going with a little larger dia. Will my torke and fuel mileage stay the same? My last truck a 03 3500 rode and handled alot better with the michilens! Dont want to make the investment unless i hear from some experience first, thanks for any feedback, Truck does have air ride.
 

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In my experience, you will get a better ride with the larger tires, but most importantly with the Michelins. Good Year can't make a round tire anymore IMOP ;)

As the 245's are an option you can get from the factory, they should work just fine with an imperceptible difference in torque. You will need to update the PCM and the EBCM to the new tire size.
 

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jafoster;1563731; said:
Have new 06 monroe gmc with 500miles on it. It came with goodyear 225 r70 19.5s. Does anyone have any experience with the michilen 245r70 19.5s ? It is the regional tread, I know my dealer will have to re program the computer going with a little larger dia. Will my torke and fuel mileage stay the same? My last truck a 03 3500 rode and handled alot better with the michilens! Dont want to make the investment unless i hear from some experience first, thanks for any feedback, Truck does have air ride.
FYI there no increase in Diameter with that size just width, tire sizes are read in MM and %'s, ie first number 225 (width in MM) R70(sidewall height % of width MM) 19.5 diam of rim, so your gaining width (225mm vs 245mm) and not height. Wider tires will track better but will create more slighty more drag and will be more prone to "grabbing" ruts on the road. As for the Michilen's I have run those on my Dodge 3500 and found they wandered alot, I like Toyo's myself, just my .02
 

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I put toyo 245s on a few weeks back and I'm not to fond of them coming off Michelins 225s. That track like crap and dont ride any better.
 

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Discussion Starter #7
Dirt Dog;1563782; said:
In my experience, you will get a better ride with the larger tires, but most importantly with the Michelins. Good Year can't make a round tire anymore IMOP ;)

As the 245's are an option you can get from the factory, they should work just fine with an imperceptible difference in torque. You will need to update the PCM and the EBCM to the new tire size.
Dirt dog; Will i have more torque or a little less? And what about fuel mileage? Will i notice any differance?
 

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You will have the same engine torque as before. What you will loose is some mechanical advantage by going to a larger tire. ~5%. As for MPG you will see an increase due to the reduced operating rpm
 

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Volvospeed;1567398; said:
You will have the same engine torque as before. What you will loose is some mechanical advantage by going to a larger tire. ~5%. As for MPG you will see an increase due to the reduced operating rpm
volvospeed; thank you for youre reply. My dealer,which is not a 4500 dealer,but a normal gmc dealer told me when they reprogram the computer the torque and shift points would stay the same! I simply dont like the ride with the goodyears, and have had better luck with the michelins, also the tire dealer has a large contract with ups and can give me a good deal on these tires, but he can also supply the 225 70 19.5s also. I do have all the specs on the 2 tires and the 245s will fit my factory rims just fine, I am no expert on these trucks and appreicate all input from some of you guys that have owned these trucks. I really do like the truck. Thanks for the help
 

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Anyone running the 22.5 rim/tire combo? Have been thinking about going that route lately.
 
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