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#1
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Tire load
Parking here is extremely tight. Hence softroading is common if not
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 |
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#2
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Tire load
On 11/16/2011 05:38 AM, AD wrote:
> Parking here is extremely tight. Hence softroading is common if not > 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 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 |
#3
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Tire load
On 2011-11-16 10:26:54 -0500, jim beam > said:
> On 11/16/2011 05:38 AM, AD wrote: >> Parking here is extremely tight. Hence softroading is common if not >> 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 > > 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. Absolutely hilarious! Post of the year! Dave |
#4
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Tire load
On Nov 16, 8:38*am, AD > wrote:
> Parking here is extremely tight. Hence softroading is common if not > 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 ____________________ 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 |
#5
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Tire load
On Nov 17, 3:30*pm, ChrisCoaster > wrote:
> On Nov 16, 8:38*am, AD > wrote: > > > > > > > > > Parking here is extremely tight. Hence softroading is common if not > > 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 > > ____________________ > > Just as an aside - what are the speed ratings of your tires? 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 > 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. per chart at the bottom of this article http://www.tirerack.com/tires/tirete....jsp?techid=72 for T speed rating dynamic load rating is no different that static load rating or whatever is that jim beam have made up. |
#6
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Tire load
On Nov 16, 5:26*pm, jim beam > wrote:
> On 11/16/2011 05:38 AM, AD wrote: > > > > > > > > > > > Parking here is extremely tight. Hence softroading is common if not > > 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 > > 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. > this table http://www.tirerack.com/tires/tirete...adj_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 |
#7
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Tire load
On Nov 21, 1:37*am, AD > wrote:
> On Nov 16, 5:26*pm, jim beam > wrote: > > > > > > > > > > > On 11/16/2011 05:38 AM, AD wrote: > > > > Parking here is extremely tight. Hence softroading is common if not > > > 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 > > > 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. > > this tablehttp://www.tirerack.com/tires/tiretech/general/airpress_loadadj_Tspee... > > 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 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'. |
#8
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Tire load
On 11/21/2011 05:37 AM, 1 Lucky Texan wrote:
<snip> > > 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'. 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 |
#9
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Tire load
On Nov 16, 3:38*am, AD > wrote:
> Parking here is extremely tight. Hence softroading is common if not > 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 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. |
#10
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Tire load
On Nov 21, 2:23*am, AD > wrote:
> On Nov 17, 3:30*pm, ChrisCoaster > wrote: > > > > > > > On Nov 16, 8:38*am, AD > wrote: > > > > Parking here is extremely tight. Hence softroading is common if not > > > 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 > > > ____________________ > > > Just as an aside - what are the speed ratings of your tires? > > 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 > > > 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. > > *per chart at the bottom of this articlehttp://www.tirerack.com/tires/tiretech/techpage.jsp?techid=72 > for T speed rating dynamic load rating is no different > that static load rating or whatever is that jim beam have made up.- Hide quoted text - > > - Show quoted text - _______________________ "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 |
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