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ccoop769

225/70/19.5 Tire Choice???

Im looking at getting 4 new drives. Summer Hwy tires.  Im hearing mixed reviews on michelins. im thinking of just getting the roadmasters. Got quoted $1000 mounted and balanced for the rears. I already have brand new sts on front. Im buying these mid next week when my truck gets back home. Any thoughts???? This is a 2x4 truck hence 225 and not 245's.
buster

I'll be replacing the POS goodyears this summer. Let me know what you get and how you like them.
OwenExpedited

I'm right there with buster. We have a set of continentals hdr's on there right now and they aren't that great. What kind of prices have you been seeing on michelins?  One guy told me 1556.XX for 4 225/70/19.5 load range G's.
ccoop769

OwenExpedited wrote:
I'm right there with buster. We have a set of continentals hdr's on there right now and they aren't that great. What kind of prices have you been seeing on michelins?  One guy told me 1556.XX for 4 225/70/19.5 load range G's.


Yah, michelins are about 340 a peice. The roadmasters are around 220. Havent heard anything bad about the roadmasters, nor good though. Michelins I hear the tread wear is excessive. I like the sts, wonder if that can be a drive tire?? prolly not though
Stroked 550

check out the bridgestone M729s or M726.
TriSum

I just put the Toyo's (225/70/19.5) on my steers. So far so good. Not enough miles to really say . I had Bridgestones on before and they were good. Lasted forever, but traction was marginal. I will be looking for drives here pretty soon. I may stick with the Toyo's since I get such a good deal, $200.00.

Keep us informed on what you end up getting and how you like them.

David
Coastal Hotshots
ccoop769

Well, i ended up going with the same tires that are on my steers. They are the bf goodrich st230. They run $239 a tire, g rated 14 ply, 110 psi. Dont know the weight rating but im sure I will never be over it. Overall im happy.

Figure $1000 dollars for stock generals gets your about 65,000 miles towing 100%.

These bfgst230's run about $1800 which if only lasts 120,000 miles I break even as if I still had my generals, but i have a true commercial tire now. These are regrooveable also. Will post a picture later.

Overall ride is nice i guess. Will keep you informed on wear.  Oh yeah, these tires are all position tires. So im going to be kicking myself in the arse when winter comes.
ccoop769

Brandon M

i have kumho krd-02 traction tires on my truck 245/70r19.5 14ply load range "g" 110psi.  they have about 70k miles on them. a bad alignment ruined my front tires but my rear tires still have plenty of tread left i think around 13/32". i'm replacing the steers tomorrow with kumho krs-03 steer tires. i have been very pleased with the kumho brand. was just quoted 223.00 a tire for the steers and 226 a tire for the drives/tractions.
mbeal

225/70/19.5 Tire Choice???

When you are changing from 17" to 19 inch rims and tires, how do you compensate for the speedometer ratio change?  Are you running automatics as opposed to sticks; and what axle ratios are you pulling with?
Did the 19" change your fuel economey?
Hauling cattle and hay with 24' trailers (Featherlite for the cattle and Gortzen gooseneck flatbed for the hay [14k loaded]), I got the highest axle ratio with the 6 speed stick and average mid 19 with no trailer, 13+/- on the flat and 10 running over the north cascades.

Do you have any issues getting moving from a dead stop with the 19"?
CnCTransport

225/70R/19.5

the place where I got mine say that you do not have to recalibrate speedo with this size 19.5, if you go to 22.5 or 24.5 then you will have to recalibrate.. no noticible change in take off and stops but ride is slightly rougher due to higher psi


Hope this helps

Chris
TriSum

Hey Guys, just so you know. You do NOT have to run the MAX air pressure the tire states. You only need enough pressure to support the weight the tires are carrying.

For instance:

My tires are 3620 @ 95psi in a single application (fronts) and 3450 @ 95psi in a dual application (rears). This means in the front each psi of air will hold 38.1 lbs. (3620/95=38.1). My front axle weighs in at 6400 lbs, so take 6400/38.1=168 psi divided by 2 (each tire). So I need to have 84 psi in the front tires to carry my "weight". You would do the same for the rear just divide it by 4 tires.

There is a huge difference in ride quality between 95 and 85 psi and you will notice your tires will wear better also.

Just some FYI.........

David
Coastal Hotshots
Gary

Good tip David.

Some other stuff that may save you a few bucks in tires?

If I noticed a funny wear pattern developing on any of my tires I might adjust the pressure on that entire axle to see if I could correct the wear pattern.  Within a safe range of course.  

Also, Just a small drop in pressure in one single tire on a axle can also cause a tire or tires on a sister axle to develop odd wear. The reason is the sister axle will be forced to hold more of the load weight. I walked around my truck once a week (during my down time) and checked air pressure and even checked tread depth. It's a little time consuming but it's saved me a lot of money in tires expence.

Another way to easily spot abnormal wear or low pressure is by driving trough a dirt lot. Tires showing less dust could be low. Tires that are developing a odd wear pattern can easily be spotted also.
F550

Word of caution... don't go too low on tire pressure on 19.5 tires.

Unlike 16" and 17" tires of the 3500 and 350 one tons, the 19.5" tires on the 4500 and 5500 (450 and 550) class 4 & 5 chassis have steel corded sidewalls.

If the pressure is run too low (below 75 psi for a load range G tire), then the steel in the tire's sidewall can flex too much and too often (650 times a minute at 60 mph), leading to metal fatigue and eventual failure.

Imagine wriggling a coke can back and forth back and forth a few times... it eventually separates.  So can the thin wires of the steel corded sidewall, leading to zipper failure that can be catastrophic, as well as lethal for an unfortunate few too many.

This is one of the reasons why 19.5 tires are strongly recommended to be inflated in a safety cage if found to be below a specfied psi in service.

Each tire company will have a minimum inflation pressure chart to consult before airing down too low.   I believe 65 psi is a common minimum for Load Range F tires, and 75 psi is a common minimum for Load Range G tires, but consulting the manufacturer of the specific tire is the best practice.

Speaking of airing down, some people air down for floatation.  That is not a good idea for half size rims like the 19.5, 22.5 etc.   Half size rims (xx.5) have a shallower bead taper, at 15 degrees, than whole size rims like the 16", 17", and 18" rims on one tons, that have a steeper bead taper of only 5 degrees.  The steeper 5 degree bead taper retains the tire on the rim better than the shallower 15 degree bead taper.  But the whole size tires are generally more flexible to mount over that steeper taper, whereas the half size truck tires have stiffer steel corded sidewalls that need a shallower rim bead taper in order to mount them, as their sidewalls are stiffer.

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