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Mopar1973Man

New Tire Size found 235's to 245's

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Speaking of pizza cutters...I'll be changing the 285/75R16s on my first gen back to 255/85R16s when I have some spare time next month; in the brands I have, they're both right at 32.8". I'm right at 1800rpm unloaded on a flat at 70mph with converter locked.

 

Stock tires were 235/85R16.

 

There's torque galore to overcome any minor differences in diameter from 30-33", and I can't seem to keep rubber on the rear tires regardless of how wide/skinny they are :whistle:

 

 

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3 hours ago, ofelas said:

Speaking of pizza cutters...I'll be changing the 285/75R16s on my first gen back to 255/85R16s when I have some spare time next month; in the brands I have, they're both right at 32.8". I'm right at 1800rpm unloaded on a flat at 70mph with converter locked.

 

I run a 255/80R17 in the winter and love them. They aren't huge, but have more axle clearance than 245's or 265's. Since they aren't very wide they also have less unsprung weight than other 33" tires.  

 

I had 4 chains on breaking trail yesterday thru 10" of fresh snow and only drug the diff a couple times, I am pretty sure it would have been nearly constant with 245's or 265's. 

 

There is that fine line between compromise and necessity, for me that's 255/80R17 in the winter and 245/70R19.5 in the summer. 

 

I've contemplated a gear swap to 4.10's for years, but the only place I'd really get a big benefit is at 65 with a trailer in 6th which I don't do all that often but when I do it's normally for hours so I start thinking about gears again. It's also only with the added drag of a camper trailer. 

 

Then again I did 750 miles in a day two weeks ago with a horse trailer and 4.10's would have been annoying in 6th at those speeds. So my money won't be going to gears... 

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Comparing... 255/80 R17 to 265/75 R16 basically the same width of tread. 255's are a 33 inch tire. From the ground up to the axle centers.

 

285/75 R16 - 16.4 inches. (+0.1 inches)

255/80 R17 - 16.5 inches.

235/85 R16 - 15.85 inches (-0.65 inches)

265/75 R16 - 15.8 inches. (-0.7 inches)

245/75 R16 - 15.25 inches. (-1.25 inches)

215/85 R16 - 15.20 inches (-1.3 inches)

 

Not a huge difference till you get to the 245's which is an inch difference from axle center line down to the ground. Basically, you can travel in a whole 1.25 inches more snow than I can. Not a huge loss in my book.

 

 

Edited by Mopar1973Man

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10 minutes ago, Mopar1973Man said:

Comparing... 255/80 R17 to 265/75 R16 basically the same width of tread. 255's are a 33 inch tire. From the ground up to the axle centers.

 

285/75 R16 - 16.4 inches. (+0.1 inches)

255/80 R17 - 16.5 inches.

235/85 R16 - 15.85 inches (-0.65 inches)

265/75 R16 - 15.8 inches. (-0.7 inches)

245/75 R16 - 15.25 inches. (-1.25 inches)

 

Not a huge difference till you get to the 245's which is an inch difference from axle center line down to the ground. Basically, you can travel in a whole 1.25 inches more snow than I can. Not a huge loss in my book.

 

 

I’m sure you meant 255/85R16 (sidewall being 85% of tread width), rather than the “80”. 

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32 minutes ago, Mopar1973Man said:

Comparing... 255/80 R17 to 265/75 R16 basically the same width of tread. 255's are a 33 inch tire. From the ground up to the axle centers.

 

285/75 R16 - 16.4 inches. (+0.1 inches)

255/80 R17 - 16.5 inches.

235/85 R16 - 15.85 inches (-0.65 inches)

265/75 R16 - 15.8 inches. (-0.7 inches)

245/75 R16 - 15.25 inches. (-1.25 inches)

 

Not a huge difference till you get to the 245's which is an inch difference from axle center line down to the ground. Basically, you can travel in a whole 1.25 inches more snow than I can. Not a huge loss in my book.

 

 

 

When the center of the axle is only 7.5” off the ground I’ll take 1.25” of extra clearance, same goes for rocks and such. 

 

When the axle tube starts to drag then issues start to arise and 1.25” is a lot, IMHO

 

Its all about what trade offs we want to make. We’d all get better mileage in a 2wd truck, but for many of us that would be worth it the few times a year we use 4wd. For me the taller tire means more clearance and it’s worth the slight hit I’ll take the rest of the time. 

 

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19 minutes ago, AH64ID said:

When the center of the axle is only 7.5” off the ground I’ll take 1.25” of extra clearance, same goes for rocks and such.

 

Very true. If your really offroad a bunch 35" or 37" would do much better for clearance. :wink:

 

19 minutes ago, AH64ID said:

Its all about what trade offs we want to make. We’d all get better mileage in a 2wd truck, but for many of us that would be worth it the few times a year we use 4wd. For me the taller tire means more clearance and it’s worth the slight hit I’ll take the rest of the time. 

 

Again for some that do travel offroad a bunch yeah bigger tires have their merits. I can see trying to clear rocks and such being a needed thing. Be even with stock tire sizes so close at 0.65 or 0.7 inch difference that not a heart breaker. I can see where a 285's just way too much rotational mass where your 255/80 do just a bit better. All the years of running 235's not fair from your mark. 

 

Now for someone like myself, that is now committed to being a pavement pounder that -1.25 inch is a bonus with less wind drag under the truck. If was to be able to change the role of my travels I might consider going back to 235's again being that extra bit of clearance. Merits can be had in both directions just depending on what you plan on doing with the truck.


Even in my day of back country travels and firewood hauling never really had any issues. Now being I run that BigTex trailer for firewood that even lower to the ground clearance wise. If the trailer will clear it the truck has no problem.

 

I can also see the difference in the travels were you might be true offroad (I mean off the forestry roads all together cross country). That would require that kind of extra clearance. 

Edited by Mopar1973Man
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I've been reading these posts with interest but nothing to this point has made me think I would change tires and size I have been using at least 3 or more years on this '02 and my previous '01 which got totaled.  NItto Duragrapplers 285/75x17 on 3rd Gen wheels.  Load range E, weight rating of 3970 and a very stiff sidewall which is one major feature I was after. 

 

They tow very well and I could not tell much difference in mileage between the previous 265's original on the '01.  '01 had 3.55 open diff while the '02 is 4.10 suregrip.  I did pain quite a bit over getting a straight tread tire as opposed to something with some type of traction tread.  So far no complaint and that is several times in snow and have yet to hang iron.  First time I took the '01 to Campers hideaway and if anyone knows the road there you know how steep that is in a couple places.  I never thought I would make it barefoot but climbed right through the worst part with little difficulty.  Our place is the very first at top of the hill so did not have to deal with anything too steep inside.  Coming back down the rig did try to swap ends but I managed to finagle it OK.

 

While there have been more, this last winter I really got caught by surprise.  I was on my fav steelhead fishing river and by myself as my pard had only spent one night.   Last weather report was one he came with and it was pretty fair one 2 days old.  I had nearly left day before but decided to wait until next morning to miss most of PDX suck traffic and drivers. 

 

Imagine my surprise to wake up to about 2" of snow!  As I recall it was also the first Saturday of spring break.  I figured probably not that bad on towards PDX which turned out true but not until after the coast hills.  Traffic was everywhere and some spun out including

semis and a number of TT and MH either spun out or pulled off to the side.  Any on my side I managed to drive right around.  I pulled off at rest stop east of Elderberry Inn and when I stepped out the snow was at least 18" deep.

 

Never thought I would get going again but did and never had to hang iron.  Not too much trouble at any one spot.  That was a new set of tires both of those occasions so may be different with less tread on them.  Nevertheless I am extremely pleased and I would estimate no less then 60,000 miles out of a set, probably more.

 

That's my story and I'm stickin' to it!!  :smart::lol::burnout:

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1 hour ago, AH64ID said:

Those are a good tire. Dad runs them on his 06 when the camper is loaded up. They are one of the last few 17’s with more than 3195lbs of load capacity. 

 

They are a good tire.  I had about 40,000 on the first set when I got hit and totaled the '01.  Lost a tire with no damage to rim but couldn't find a matching one so ended up finding another set of right priced 3rd Gen rims and bought 4 new.  I have 7 mounted and 1 loose rim now.  IIRC the first set still had about 7/32 tread but will measure one tomorrow just so I know for sure.  Discount tire says Nitto won't have those for much longer because they don't make enough $$$ on them.  Why is it when you find something you really like it seems like it eventually disappears???  BTW, forgot to mention in my previous post I was towing my toy hauler on hwy 26 in the snow.  While it is larger than my previous one it is also lighter but still over 15,000 gross.

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6 hours ago, Russ Roth said:

Discount tire says Nitto won't have those for much longer because they don't make enough $$$ on them. 

 

Kind of like a Big O tire I fell in love with years ago and the quit making them.

Edited by Mopar1973Man

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4 hours ago, Mopar1973Man said:

 

Kind of like a Big O tire I fell in love with years ago and the quit making them.

 

Not just tires that happens to.  I remember this chocolate desert thing that came out when I was about 25.  Loved it and couple years later no more.  What's up with that anyway???  Good product that seems quite popular and then all of a sudden no more.  Can think of others too if I spent the time. Is Big O even around anymore?  I don't recall seeing them for quite some time.

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31 minutes ago, Russ Roth said:

  I remember this chocolate desert thing that came out when I was about 25.  Loved it and couple years later no more.  What's up with that anyway??? 

It happened to me quite a few times too, not chocolate but just random stuff that makes sense 

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22 minutes ago, Dieselfuture said:

It happened to me quite a few times too, not chocolate but just random stuff that makes sense 

 

Well I happen to be a chocoholic so I notice when in that realm more than most!   :lol::lmao::smart::cool::thumbup2::thumbup2:

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Dec. 11, 2018 was my first night of running the 1996 Dodge Ram 1500 with the 215 tires on snow. All I can say is WOW! These things really bite the pavement even with a snow-covered highway. It snowing pretty good on the way home that little 1996 Dodge Ram 1500 ran great with the 215/85 R16 tires. Came to Fort Hall Grade and was count all the car and truck slid off the highway there were 6 vehicles all slid off the highway most with wide tires. I was still running 2WD. After seeing about 3 of then I pull the transfer case into 4WD. Still, in all, I was still cruising 45 to 50 MPH and it was snow good. Broke over the top of the grade and down the backside still awesome control. Grabbed the O/D off button let the truck unwind down the grade. Hit the bottom of the valley and went back to overdrive and 45 to 50 MPH speeds. This is the best this little truck has ever run in the snow!

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