Join Date: May 2008
Location: Fort Worth, Texas, USA
There is a myriad of reasons why they will not ever sanction the use of a ct on a mc. And yes, one of them is due to liability issues. But you must know who it is that sets the standards for ALL the rims and tires whether they be a car, motorcycle or even an airplane. It is neither the vehicle manufacturer (automobile, motorcycle or airplane) nor the tire manufacture. It is the Tire and Rim Association. They are the people who do all the research and development as to which and why certain aspects of the rim and tire work best for it's own application.
Your quote "I'm not at all against using a CT on a motorcycle personally, but unless studies are done and statistics kept, no one has all the facts... " Umm yes, those who have do the math and spent billions of dollars on research and development for both the ct and the mt do have the answers. It is just that some people will dismiss any and all fact presented. As far as statistics, I can only refer you to the "Hurt Report". 19.1% of the 3622 motorcycle crashes studied, had a modified rear wheel. As to what a modifiedrear wheel all consisted of, he did not delineate.
But to understand as to why mc tires will not last as long as a ct, will take great lengths of understanding physics, and chemistry. But to try understand some of the chemistry that goes on with a tire, one of the main ingredients in all types of tires is silica. Silica is what makes a tire "grip" the road. Or in other words makes the tire "softer".The higher the silica level the "grippier" or the tire. The more a tires grips the road surface, the faster it will wear out. The lower the amount of silica, the less the tires wear out and the less grip they have. A motorcycle can be designed to last 40,000-60,000 miles. The problem is the level of silica required to acheive thatwould be to low to have maximum adhesion that a motorcycle requires in corners.
To understand some of the physics, a ct on mc DOES NOT increase traction. The only way to increase traction is to increase weight. Case in point, if you get stuck in the mud, the best way to get it unstuck is bounce on the bumper closest to the drive axle to gain traction. By increasing the weight, you can gaintraction. As you bounce, whenthecoil springs rebound from being compressed and release all the energy causing the the car to go up, as the car goes upthe tire spins faster in the mud because it has lost traction due to not as much weight on the drive axle.Now to try to further understand let's try an experiment with a brick. Stand the brick up on its end. Measure how much effort it takes to move the brick. Write it down. Down lay the brick flat and measure again how much effort it takes to move they brick. It will require they same amount of effort to move the brick either way the brick is orientated. It won't even matter it you balance the brick on it's sharp edge. It will still require the same amount of effort. So the amount "surface material" doe not affect traction. These are the basic laws of friction.
One of my favorite sayings "You are entitled to your own opinion but not your own facts." If your opinion is that a ct on a mc is that it fits and is safe, well that's your opinion and I'm not going to try to convince you otherwise. I have said many times, it's your ride and ride it like you want. But let's not confuse opinion with fact.
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To my beloved wife Carol, may she R.I.P 6-3-2012 @ 7:35 pm
You will forever be on my finger and forever in my heart.
Miles of 1-13-16
1977 GL1000 Nekkid Wing - 19,1000
1979 GL1000 Nekkid Wing - 58,180
1982 GL1100 Interstate - 100,000
1982 GL1100 Aspy (parts bike) - 61,522
1985 V45 Magna - 50,985
1986 GL1200 Aspy with Champion Escort II Sidecar - 128,911 (odometer broke in 9-12. around 180,000)
2003 GL1800 10,000
Two Wheels Down, Shiny Side Up
GWRRA Member Region H, Tx/Chapter P