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post #11 of 17 (permalink) Old 01-14-2011, 01:27 PM
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Broke Winger wrote:
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They do the same thing as dyna beads Only they cost more.

Persoanally I would think the dyna beads are likely to work better as they (the centramatic) are placed in the rim closer to the center of the wheel assembly where the force they create isn't going to be as strong as where the dynabeads are in the tire and thus placed further away from the center where the force they create will be stronger.

For a product that costs more but doesn't really work any better...not for me.

An interesting experiment would be to attach a ball to fish scale using a 3 ft piece of string. Swing it above your head at 2 revolutions per second and then record the reading on the scale. Do that again with a 6 ft string and record the reading.


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post #12 of 17 (permalink) Old 01-14-2011, 01:59 PM
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Well, over the last 30 minutes, I performed the experiment that I put forth in the last post. Not really that exact, but I got the RPM for each string length as close to the same as possible with just swinging my arm around. I used a piece of metal about 10 oz in weight. Scale reading at 3 ft and 60 RPM was 8 lbs Scale reading at 6 ft and 60 RPM was 11 lbs. So, Broke, me thinks you are correct. Of course, the centripedal force, which the scale reads, would be somewhat affected byair resistance and the like.

Think I am going senile.------OR

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post #13 of 17 (permalink) Old 01-16-2011, 08:54 AM
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Those cantramatics get good feedback from the gl1800 owners using them. I think they are over priced, but if they stop all the wobbles and tire cupping that seem to happen many 1800 wings then I guess they are worth the money.
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post #14 of 17 (permalink) Old 01-16-2011, 10:55 AM
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I put a set on the front of my trike. Nice smooth ride for me. Im also looking to see if it helps with the cupping. It seems no matter who balances the tire or if you use Dynabeads(I tried them) you have a 50-50 shot on the tire cupping. Im looking forward to just changing the tire with no balancing and no mess on the floor while doing it.

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post #15 of 17 (permalink) Old 01-16-2011, 12:16 PM
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general math looks a little like this based on very general numbers

160-60-17( the only loose tire wheel combo I had laying around) has a circumference of 80"
One mile = 5,280 feet
5,280 feet = 63,360 inches
60mph = 1 mile per minute
Distance / Circumference = 792 revolutions per mile
Revolutions / time to cover distance
792 revolutions per mile / 1 minute per mile = 792 rpm

800rpm doesn't seem like much until you figure in wheel diameter and weight and tire weight, the numbers get pretty big pretty fast.
now lets see at 200mph thats roughly 2560 rpm the wheels are turning at,,covering approximately .27 mile or roughly 1/3 mile in 5 seconds uh uhm yeah it's already a mile BEHIND ME!
OK enough with the stupid math tricks here's the real deal wheels are rough cast for bikes. And they are not round as cast. Wheels are then center drilled for the axle next turned on a lathe(most likely a cnc) to get the wheel mounting lips and flange and outside finish areas round and centered to the axle. This process is quick simple and easy but doesn't assure static balance as spokes rim centers etc may not be perfectly centered. I discovered this years ago when polishing wheels on sportbikes became the next big thing. You could spin the wheel on the bike to polish it and it was perfectly round on the machined surfaces but when you got onto the cast areas it could be as much as 1/16th inch difference from the high to low spot!
We mount our own tires and balance them with a static manual spin balancer. Years ago I got into the habit of balancing my wheel BEFORE mounting the tire by removing small amounts of metal from the heavy area until the wheel was balanced. IF you have a wheel with a small imbalance and a tire with a small imbalance and by sheer coincidence you place the 2 together your going to need more weights!
Another fact to consider is if you have an unbalanced wheel and unbalanced tire and you mount them, the balance is off, break the bead rotate the tire on the rim and try again.
We run Pilots on Marie's Racebike and last time we went through 3 NEW tires before we found one that required very little weight to balance!.
Although your mechanic won't like it he should be able to rotate the tire on the rim to get you closed to static balance, if your doing it at home yourself balance your rim THEN mount your tire. so the numbers above tell you why we spent so much time balancing wheels but in the long run this is something that can benefit every rider on any bike if they want to spend a little time.
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post #16 of 17 (permalink) Old 01-16-2011, 06:00 PM
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Good points . And at 200 you surely want a smooth ride .

PerhapsKeith Stonecould help

Mike
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post #17 of 17 (permalink) Old 01-16-2011, 08:00 PM
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