Thinking of jumping size on replacement.

Thats what i run and no issues here at all

I run 295/75/16s on my '01, and it required I go with a leveling kit, as I rubbed the fenders pretty good..Granted, I run a 16x10 wheel with a good bit of offset, I just don't remember what the offset is , at the moment.. I've got about 1/5-2.0" of tire sticking out from under the fender lip..

I'm not happy with the stock rims... they're corroding under the center caps... but I seem to have a lot of room. I haven't raised or leveled & in fact, that would likely be a problem as I have trouble getting up on my step as it it. (MS has screwed my legs up pretty much.) BUT I have plow pkg & camper pkg so that may boost the height from normal.Hmmm.Anybody have advise?

With the factory rims I have had them rub on mud flaps if you have them and I have had them rub on the lower control arms, nothing serious and only at full lock turn. Just get funny looks from passenger when they hear it rub for a second.

I'm not happy with the stock rims... they're corroding under the center caps... but I seem to have a lot of room. I haven't raised or leveled & in fact, that would likely be a problem as I have trouble getting up on my step as it it. (MS has screwed my legs up pretty much.) BUT I have plow pkg & camper pkg so that may boost the height from normal. Hmmm. Anybody have advise?

Mine rub on the lower control arms too at full turn. But I wouldn't advise going up in size, you'll lose mpg's. I know they look nice but I'm pretty dissappointed in mine mpg wise and think I'll drop back down next time. I've got Toyo open country m/t's.

I run the hankook dynapro rt03s. Mine don't rub the PDAs, mine rubbed the fender pinch mold and front liner. Agree on fuel economy suffering, however.

OK, I'm going to go measure my clearances with OEM tires (which are a factory up-size... I presume, with one of the packages the truck is equipped with). I'm confused by why your MPG suffer with larger tires. My MPG isn't great & a highway speeds (with my 4:10 gears) I'm reving higher than I want... unless I kick in the OD on the Level or Down-hill (issue is towing)... I'm thinking the larger tire will cut the final ratio, moving me by some small percentage toward standard ratio like 3:55.

i had 33x12.5r16.5 on the back. i lost 1-2 MPG when i put the factory tire size back on. not everyone loses MPGs from big tires

I tried out a set of Yokohama Geolandars in 285/75/16D and they rubbed hard on the control arms when turning sharp left. Stock everything else.

The Original Mich LTX 265/75R16 (with 55K on them) appears a bit under 16" radius. With my plow & camper packages, the truck pretty much sits up there. There is ~4" of static clearance with the wheel turned towards the fender.Russ

OK, I'm going to go measure my clearances with OEM tires (which are a factory up-size... I presume, with one of the packages the truck is equipped with). I'm confused by why your MPG suffer with larger tires. My MPG isn't great & a highway speeds (with my 4:10 gears) I'm reving higher than I want... unless I kick in the OD Level or down hill (issue is towing)... I'm thinking the larger tire will cut the final ratio, moving me by some small percentage toward standard ratio like 3:55.

MPG suffers due to the additional rotating mass + "taller" final gear ratio created with a taller tire. When I say additional rotating mass, I mean like my 295-75/16 Hankook DynaPro Rt03s are about 135 lbs each (wheel + tire).

Tires may be easily changed but are the final component of the gear ratio. In my limited experience there can be too tall a ratio but also too low. In my experience 4.10 is too low for what I do, with the tires which came on it. I think a larger circumference tire, will raise the effective gear ratio moving it in the direction I want to go. I think that rather than decreasing MPGs it might improve it, at cruising speed, where I'm reving higher than I'd like. The stock 3.55 ratio or even 3.73 would be better than this. (I did not know enough about diesels & the truck salesman sold me what was on the lot... I've learned a lot since then.)

OK, I'm going to go measure my clearances with OEM tires (which are a factory up-size... I presume, with one of the packages the truck is equipped with). I'm confused by why your MPG suffer with larger tires. My MPG isn't great & a highway speeds (with my 4:10 gears) I'm reving higher than I want... unless I kick in the OD on the Level or Down-hill (issue is towing)... I'm thinking the larger tire will cut the final ratio, moving me by some small percentage toward standard ratio like 3:55.

Tires may be easily changed but are the final component of the gear ratio. In my limited experience there can be too tall a ratio but also too low. In my experience 4.10 is too low for what I do, with the tires which came on it. I think a larger circumference tire, will raise the effective gear ratio moving it in the direction I want to go. I think that rather than decreasing MPGs it might improve it, at cruising speed, where I'm reving higher than I'd like. The stock 3.55 ratio or even 3.73 would be better than this. (I did not know enough about diesels & the truck salesman sold me what was on the lot... I've learned a lot since then.)

I'm not happy with the stock rims... they're corroding under the center caps... but I seem to have a lot of room. I haven't raised or leveled & in fact, that would likely be a problem as I have trouble getting up on my step as it it. (MS has screwed my legs up pretty much.) BUT I have plow pkg & camper pkg so that may boost the height from normal. Hmmm. Anybody have advise?

Thanks bugman,I'm also 8800 gvw so sounds like pretty identical suspensions. I'd like to just bump to 285s/75R16's, if they'll fit. I like the look of a off-road tread but really don't go off-road. What I need is an open enough tire to do well in snow & slush.

OK, I'm going to go measure my clearances with OEM tires (which are a factory up-size... I presume, with one of the packages the truck is equipped with). I'm confused by why your MPG suffer with larger tires. My MPG isn't great & a highway speeds (with my 4:10 gears) I'm reving higher than I want... unless I kick in the OD on the Level or Down-hill (issue is towing)... I'm thinking the larger tire will cut the final ratio, moving me by some small percentage toward standard ratio like 3:55.

According to a rpm/mph speed chart that ISX posted here somewhere I should have had 3.55's but in reality I have 4.10's so I guess they make that much difference.