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Old 02-07-2010, 10:58 AM   #31
Kenneth_Moore
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Originally Posted by sarnali2 View Post
Hook, Line and Sinker eh?......roflmao
You had me right up to the Slime. Nobody is stupid enough to put that crap in a motorcycle tire.
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Old 02-07-2010, 12:39 PM   #32
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Hook, Line and Sinker eh?......roflmao
Damned hook was sharp too!
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Old 02-07-2010, 03:29 PM   #33
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"It looked fine, thought all was good."

'Thought' is a real bad word when making modifications.

"As near as we could figure out, it fit ok until the wheel speed was high enough to "sling" the tire a bit bigger,...."

What was he doing like 200 MPH on his Sportster? Even if is 'slung' it a bit bigger, how much bigger could that tire have gotten? 1/64th of an inch? It was obviously a defective tire, or it was never clearanced correctly to begin with. There is nothing wrong with changing tire sizes if one actually knows what they are doing. It is not any dangerous than changing oil viscosity. I do stress the 'if you know what you are doing' part though. Yooz guys are trying to make it into rocket science.
If youve seen what my eyes have witnessed you'd realize how tall a tire can become at high speeds on a dyno. Think about a drag car doing a burn out. Try standing right to next to a rear motorcycle tire that's spinning at 186 mph.

Iv seen rude deformations in tires that exceeded the tires capacity on a dyno and let me tell you, it's strange looking. Imagine the tire having cupped sections starting from the contact patch of the tire on the Dyno
wheel and multipling three times around the back of the tire,...at that speed. Alot of force.
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Old 02-07-2010, 03:45 PM   #34
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Try standing right to next to a rear motorcycle tire that's spinnings at 186 mph.
That '72 Ironhead wasn't quite that fast...
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Old 02-07-2010, 03:54 PM   #35
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That '72 Ironhead wasn't quite that fast...
Yeah it was more like 18.6 mph for the Ironhead.
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Old 02-07-2010, 03:56 PM   #36
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"If youve seen what my eyes have witnessed you'd realize how tall a tire can become at high speeds on a dyno."

Tell when you last saw an Ironhead Sportster on a dyno deforming tires?
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Old 02-07-2010, 05:08 PM   #37
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I saw the weirdest thing on my '78 Sporty...I had one of those Cheng Shin tires on there that are really hard compound. I was doing burn outs and the tire got going so fast it expanded but only the center tread, as we all know the side walls on Cheng Shin are the same compound they use in ceramic brake pads so they stayed firm and the center softened up to form a point.....Well I was on asphalt and after all that Sporty torque wearing away the asphalt got hot and melted allowing the tire to slice down into it.! As soon as I stopped the asphalt hardened up again trapping the wheel, boy it took me forever to chip the dam* tire and wheel out of that stuff as all I had was a rock and my Buck knife.....You can still see the spot where they had to come patch the road.
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Old 02-07-2010, 06:35 PM   #38
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That '72 Ironhead wasn't quite that fast...
Answer from typical Harley rider: "Yeah but that Muther F-er has a shyt load of torque".
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Old 02-07-2010, 06:37 PM   #39
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"If youve seen what my eyes have witnessed you'd realize how tall a tire can become at high speeds on a dyno."

Tell when you last saw an Ironhead Sportster on a dyno deforming tires?
Never,... but obviously the tire encountered some type of clearance problem which was most likly due to the expansion of the tire at speed,..right? Thats all I was referencing was that a tire expands under that much load/speed.
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Old 02-07-2010, 07:29 PM   #40
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Never,... but obviously the tire encountered some type of clearance problem which was most likly due to the expansion of the tire at speed,..right? Thats all I was referencing was that a tire expands under that much load/speed.
The clearance problem was most likely from something contacting the tire with the dude sitting on the bike. It's one thing most guys don't check. They check everything on a lift and it all looks great. Sit on in and compress the suspension a couple inches and everything changes, including what contacts the tires at times. It is HIGHLY doubtful that the tire expanded any appreciable degree to cause a blowout. The old Ironhead just wasn't capable of doing that.
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