struns - 01 October 2009 09:39 PM

GreyWolf74 - 30 September 2009 11:20 PM

struns - 30 September 2009 08:12 PM

[
NO!

Take a 6000lb Suburban down the highway doing 80mph SLAM on the binders !! DO those tires move on the rim?same as a fast getaway. If this would happen ever passenger car and truck would have to bring thier ride in every time to re-balance the tires! After riding and repairing bikes for some 45 years the only way the tire will move on the rim is if there is not enough air pressure! I started mounting tires on cars in 1970, the hardest part was breaking the bead, even with the machine! The only part I seem to agree with is the old drag racers w/screws in the rim(do they still do this?)Even if they would move it would be very little! Otherwise they are on there like a crabs A..!

Even a street car when the tire blows the bead stays intact same as a F-1 or Nascar!
do nascar tire spin in the rim?

Struns, you're missing a few things here. The most important is the limiting factor of tyre grip. A racing tyre has tremendous grip -- Formula One tyres can achieve upwards of four Gs in a turn, sometimes more. Drag racing tyres launch the cars to over 300 mph in under six seconds. The average street tyre can generate maybe 0.8Gs in most applications, with an exceptional one going around 0.9 on a very good chassis. The same holds true for braking and accellerating.

Put simply, the friction circle for a street tyre is just too small to cause the wheels to turn inside the tyre beads, in most cases. Some truck tyres on the drive axels can do it, but it takes a heavy load and a lot of torque in the lowest gears to do it.

Most of the time, however, thte friction between the tyre bead and the rim -- including the ridges on the side and bottom of the bead area -- are sufficient to keep the wheel from turning.

The problem of a tyre suddenly going flat in hard cornering? I've seen it happen in slow-motin footage. What happens is this: Car makes sudden turn, outside front wheel starts sliding. If the side wall has a tall profile and it is under-inflated, the side wall tucks under the wheel rim as the tread grips the road. If the load is sudden enough, the bead at that point can be unseated. The result is called an "Air Out," and results in a sudden deflation. Since the result is a crash, people don't usually ask why the front tyre is off the rim and flat as a pancake; it just "is."

What keeps Formula One cars from that kind of fate is the construction of the tyres and how they're secured to the wheel. If the wheel is designed so the bead can't easily break free, no air-out. Also, the sidewalls are very stiff, so there is very little tucking-under as the wheel steers through a corner.

Your missing a few things too!
The word spin for one.
Reading a complete post.
Misinterpreting a post.
And going off topic!

NASCAR Cup cars sometimes have problems at tracks that require heavy braking, the brakes get hot which heats the rim which in turn causes the tire to break loose and either spin or as GW said, AIR-OUT.

Sprint cars and dragsters use Bead-Locks which literally bolt the bead to the rim. They run very low air pressures (5-9 LBS) and were known to spin the tire on the rim without them.

I can't say what F1 does, because I don't know, But SS has spent lots of time working on high-tech stuff, so I'd tend to believe what he says. AA JMHO

Bill

hobbymanbill -

NASCAR Cup cars sometimes have problems at tracks that require heavy braking, the brakes get hot which heats the rim which in turn causes the tire to break loose and either spin or as GW said, AIR-OUT.

off topic

Sprint cars and dragsters use Bead-Locks which literally bolt the bead to the rim. They run very low air pressures (5-9 LBS) and were known to spin the tire on the rim without them.

already mentioned in several previous posts

I can't say what F1 does, because I don't know, But SS has spent lots of time working on high-tech stuff, so I'd tend to believe what he says.

SS has made the most sense-agree

struns - 02 October 2009 01:41 AM

author="hobbymanbill" date="1254478322

NASCAR Cup cars sometimes have problems at tracks that require heavy braking, the brakes get hot which heats the rim which in turn causes the tire to break loose and either spin or as GW said, AIR-OUT.

off topic

Wrong. On topic.

He's adding squarely to the conversation. Your posts are trolling.

ipso - 02 October 2009 01:52 AM

struns - 02 October 2009 01:41 AM

author="hobbymanbill" date="1254478322

NASCAR Cup cars sometimes have problems at tracks that require heavy braking, the brakes get hot which heats the rim which in turn causes the tire to break loose and either spin or as GW said, AIR-OUT.

off topic

Wrong. On topic.

He's adding squarely to the conversation. Your posts are trolling.

TYO

NO name calling, My posts are not

ing

Oh boy, check this out: I found the smoking gun!

Looks to me like “filled and fettled”, and the glue-gun, lend serious credence to the crazy-glue theory.



But… maybe not. The rim looks damaged to me. I doubt they are sending that rim back out on track. This is probably either a fake posed shot of something they do on a “real” wheel (which is my guess), or possibly a prep-process to separate a used tire from the rim for more convenient shipping back to the Bridgestone mothership – or for on-site failure analysis. Or maybe he is filling in/cleaning the grove simply for aero.

I’m going with glue. That is a glue-gun, therefore there must be glue.

How’s that for proper forum logic?

ipso - 02 October 2009 03:16 AM

Oh boy, check this out: I found the smoking gun!

Looks to me like “filled and fettled”, and the glue-gun, lend serious credence to the crazy-glue theory.



But… maybe not. The rim looks damaged to me. I doubt they are sending that rim back out on track. This is probably either a fake posed shot of something they do on a “real” wheel (which is my guess), or possibly a prep-process to separate a used tire from the rim for more convenient shipping back to the Bridgestone mothership – or for on-site failure analysis. Or maybe he is filling in/cleaning the grove simply for aero.

I’m going with glue. That is a glue-gun, therefore there must be glue.

How’s that for proper forum logic?

That is a heat gun.

wilmywood8455 - 02 October 2009 06:12 AM

ipso - 02 October 2009 03:16 AM

Oh boy, check this out: I found the smoking gun!

Looks to me like “filled and fettled”, and the glue-gun, lend serious credence to the crazy-glue theory.



But… maybe not. The rim looks damaged to me. I doubt they are sending that rim back out on track. This is probably either a fake posed shot of something they do on a “real” wheel (which is my guess), or possibly a prep-process to separate a used tire from the rim for more convenient shipping back to the Bridgestone mothership – or for on-site failure analysis. Or maybe he is filling in/cleaning the grove simply for aero.

I’m going with glue. That is a glue-gun, therefore there must be glue.

How’s that for proper forum logic?

That is a heat gun.

Or a very good hair dryer

YEP ,thats a smoking GUN !

Did the rubber melt to the rim from heat? As RE30B said before about heat buildup !
If so,I think that would be the wrong tool to fettle said stuff without damaging the rim!

The guy in the pic is removing residue from the bead area of a wheel with a heat gun and a scraper. Standard operating procedure before mounting a new tire.

struns - 02 October 2009 08:14 AM

wilmywood8455 -

That is a heat gun.

Or a very good hair dryer

YEP ,thats a smoking GUN !

Did the rubber melt to the rim from heat? As RE30B said before about heat buildup !
If so that would be the wrong tool to fettle said stuff without damaging the rim!

If there is rubber build-up on a wheel, it is probably cast-off rubber from tyres, which is very sticky when hot. They could also be cleaning the glue off the wheel.

Commercial-grade heat guns like that one are indeed hot enough to blister paint, but if you don't hold it in one spot for too long, there's no problem. They are routinely used to remove paint from wood without scorching it. I've also seen them used to heat tyre treads sufficiently to scrape the "marbles" off a scuffed-in tyre.

GreyWolf74 - 02 October 2009 08:32 AM

If there is rubber build-up on a wheel, it is probably cast-off rubber from tyres, which is very sticky when hot.

Is not the rubber compoud different from thread to sidewall to bead as far as "sticky" goes???