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AD posted on November 16, 2011, 8:38 am
mandatory :-[
I got onto a packed dirt embankment lately and it looked like the rear
right was nearly off
the ground (A4 with sport suspenders has extremely beefy front and
rear sway bars and i think
that was a contributing factor to my one-wheel-in-the-air scenario).
The Michelin X-Ice 2 are 195 65R15 and the front right tire was
severely squished,
as if it had 10psi (it actually is inflated to 32).
It seems that two diagonally opposed tires (FR & RL) were severely
overloaded while FL was
carrying maybe 1/8th of the car weight. XI2 survived somehow with
about 3800lbs worth of
a car essentially resting on 2.5 tires; thusly I wonder
to what extent the passenger tires are overbuilt.
Me thinks if I have 91 load rating that's 1356lbs and 3800/2.5 is
1520lbs.
If one manages to get two tires in the air that's 1900lbs per tire -
waaaay over the 1356lbs rating.
A blowout is sure to follow or not?
Now suppose I deflate to 25lbs before venturing into soft sands, load
capacity should drop lower yet, right?
thanks
jim beam posted on
Re: Tire load
you're making a mountain out of a mole hill. "load rating" for a tire
is that which is safe when driven at 100+ mph, at maximum air pressure
from sea level up to 10,000 ft+, when the outside temp is 120F. and
that's dynamic, not static,
you're static, you're not over-inflated, and you're not overheated. i'd
get back to calculating how many grains of sugar to put in your morning
coffee before over-thinking stuff like this again.
--
nomina rutrum rutrum
D. LaCourse posted on
Re: Tire load
http://www.tirerack.com/tires/tiretech/general/airpress_loadadj_Tspeed.jsp
shows ZERO change in Tire Load Capacity at the speeds above 100mph.
If you read my original post (you did that at least once, right, funny
guy?)
you would see that the discussion is for winter rubber
(which is typically rated Q for the hardcore and so on, usually ending
up somewhere in the
laidback winter T territory in case you haven't been paying attention)
but, then, there is always an opportunity for the next stand up
comedian wannabe to practice
his clown act on the wide fields of the usenet.
now lets try alt.autos.subaru now that the group haven't seen a tire
thread in a while :)
1 Lucky Texan posted on
Re: Tire load
I certainly can't speak to a lot about tires, and even less about
winter driving, but you can find multiple pictures of vehicles on the
track or autoX-ing that are making a turn and have one, maybe both,
inside tires in the air. For those few milliseconds, all the vectored
forces are on 2 tires - and those forces are 'almost' rolling the tire
off the rim!
Most engineers derate their designs. And for tires, they have to
consider what forces it could survive under the worst circumstances -
7 years old, worn to the wear bars and improperly inflated in -40 OR
115degreeF weather. What a new, properly inflated/maintained tire can
SURVIVE is a lot different than 'recommended use'.
Re: Tire load
if this guy can read an article from tire rack, which is aimed pretty
danged low, and still fail to understand, then i think we're wasting our
time.
--
nomina rutrum rutrum
Re: Tire load
I think I know the type: the one who tries to shuffle incompetence
under
the mask condescending remarks. Any other houses of cards
you want to show me? Lets discuss the likelyhood of honda
offering a Fit with a turbodiesel in the states hoping
that VW marketing missed something. Do you still want to humor me?
Re: Tire load
your post was just chicken little nonsense. either you knew that and
are pissed that people aren't playing your little game. or you didn't
but are having a problem with learning something new.
sure, go ahead and share what you think you know. but don't bother if
you just want to speculate or rumor.
--
nomina rutrum rutrum
Re: Tire load
I know (for a fact) that the majority of the americans does not buy
diesels.
thusly Introducing 'em (diesels) anywhere south of the premium segment
is
a suicidal act and you seem to have a problem
with the ways of the universe on your side of the pond.
Your countrymen do not like tractors. there won't be a subcompact
turbodiesel offered for sale this decade in the US, get used to it.
ChrisCoaster posted on
Re: Tire load
Just as an aside - what are the speed ratings of your tires?
Typically you'll see an S,T,H, or V rating mixed in with the size.
Mine are P-205/60*H*R-16. The answer you give may explain the
appearance of your sidewalls.
-CC
Re: Tire load
195/65R15 T91
I was thinking its Q but given no studs Michelin seems to be confident
the tire will survive past 100mph.
My suspicion this is solely for the end of life when you have less
then 4mm of thread
remaining and want to "finish it off" in summer.
Maybe it's an euro thing: the lack of P prefix for the euro market
tires:
I typically see C postfix for cargo van tires. Such as 205/70R15C for
example.
I don;t think I saw that in the US
per chart at the bottom of this article
http://www.tirerack.com/tires/tiretech/techpage.jsp?techid=3D72
for T speed rating dynamic load rating is no different
that static load rating or whatever is that jim beam have made up.
Re: Tire load
"T"?? I'm surprised. Typcially V- or higher speed-rated tires have
more flexible sidewalls that appear flattish even at spec PSI. And 65
is hahhdly low profile as far as contemporary tires go.
hmmm.
-CC
dsi1 posted on
Re: Tire load
My tires have fooled me many times. I guess that's why I keep it at 40
lbs. It also has some weird thing going on with the sidewalls. It looks
like it's riding on them about halfway up. It's the darnedest thing that
I've never seen before. This is on a Hyundai Sonata. I wanted a nice,
comfortable, inexpensive family car but those 50 series, V-rated, tires
are going to cost a lot to replace.
dsi1 posted on
Re: Tire load
I had that happen to me the other day. The tire looked deflated but it
was approaching 40 lbs when I measured it. These are Michelin Pilots.
I don't much care for them cause the rubber seems awfully soft and
it's all tore up.
Re: Tire load
There is a lot of Michelin Pilot models covering a few performance
categories. Do be sure to provide the full model name.
Well, "highway all-season" category seems to have been created for
people who value durability over grip. Also you could try
to go to a smaller wheel diameter necessitating a taller sidewall
to keep outer tire diameter about the same.
If you do not meticulously check the pressure just about every other
morning
you could also consider trading up to the current crop: from what
I hear uncle sam was insistent on making tire pressure monitoring
standard recently.
Sigh.
dsi1 posted on
Re: Tire load
Pilot MXM4 P225/50R17 93V - any info on what the "93" means? I probably
won't be getting Michelin tires again unless they're going for a low
price. I never did like that brand for some reason. OTOH, I used to have
skinny Michelins on my VW Rabbit. Those worked pretty good. If I entered
a corner a little too fast, the car would just slip sidewards without
under or over steer. That was fun stuff.
I like to buy cheap tires cause I don't drive long distances nor do I go
very fast. According to my on-board computer, my average speed is 14
MPH. (-:
Re: Tire load
that's the load index:
http://www.tirerack.com/tires/tiretech/techpage.jsp?techid=3D35¤tpage=
=3D3
Michelin makes stone hard "calling all the cops" tires (that's the
"highway all season category")
for "fun" like that. Just as any other tire maker. As I said, in the
US of A that
is a cop bait in case you like spirited cornering.
if you don't drive long distances i see no reason to skimp on tires.
your gripes about mxm4 make little sense to me then.
I have ContiProContacts that are in the same league as mxm4 and
they seem to wear slowly, at least in the moderate climate i live in.
As you would expect from zero grip tires in the all season group.
My brother swears by MXM4s. But, then, he never drove on UHP
or max/extreme perf tires, The ones that does not squeal when sliding
sideways on dry pavement.
Re: Tire load
That's what I paid for my XI2 set in 2011. coming from subaru 5sp+awd
I have serious doubts in torsen
snow handling prowess and, thusly, decided to have tires with a known
good "plowing through the snow"
capability
though i must say handling of packed dirt on a hill incline
(unpleasantly) surprised me:
I was spinning wheels with no water (snow or ice) in sight. That's at
around 40-45F
i'm not surprised audi is ditching torsen on 2012 A4: i guess its
cheaper for them than
to propagate active rear diff from S5 throughout the rest of the
lineup. Sigh.
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