That's it. I'm sending this one to Mythbusters!
That's it. I'm sending this one to Mythbusters!
'09 BMW 1200 GSA, '10 BMW F650GS (in the spring for Wife), '09' V Star 950, '09 Honda Rebel (wife is learning),
'77 Honda 750A. New garage - need more room for more bikes!
Bud Meade W9BUD IBA 44018 MOA Lifetime Member
Pouring in some dynabeads just sounds so easy. Curious, is there any motorcycle manufacturer that uses them? No, why not? Is there any motorcycle tire manufacturer that has advised to do away with weights, use beads instead? Is there any motorcycle racing team that uses dynabeads rather than balancing their wheel/tires conventionally? Many times races are won and lost due to which rider has "the most tire remaining". If dynabeads extended tire life even a few percent as they claim there'd not be any team that could *not* afford to use them.
Can I use Dyna Beads for motorcycle road racing?
No. The inner liner compound of motorcycle road racing tires is too soft to allow Dyna Beads to perform properly. (this does not apply to off-road motorcycle racing)
Those are a couple pretty good points. It raises a couple questions for me...
So my question is, does it "seem" to you that the tire mfgs could develop the tire you suggested because you have a lot of experience with rubber compounds used in tires and you're going through a process of thinking "If compound x, then A happens. If compound y, then b happens?" That would be good to know. Or does it "seem" that way to you because you just kind of said "hey, why not, so it must be possible"?
A Piper Arrow and an F-16 have a lot in common, but they have a lot different also. I'd bet the R&D departments at Piper aren't applying all the principles of the F-16 because it's over kill. And the F-16 group probably isn't looking at the Piper Arrow saying "Hey, check out that wing geometry." They both have different performance requirements. That doesn't make either one invalid for it's own environment.
The discussion about dynabeads is turning out to be like zinc content in oil and motorport kevlar. I don't have a vested interest in if anyone uses dynabeads or not, but if we're going to have the discussion, let's at least debate apples and apples.
It's almost seems like STP all over again.
As an update.......I am trying them...and have noticed no appreciable nor "provable" difference. Thanks for all your comments.
Because of the doubts raised in this thread I went with lead weights yesterday when my Shinko 705 delaminated after 6700 miles. It took 2.25 oz on either side of the spoked rim. Rode home. Felt great. Marked the weight location with a grease pencil and removed the weights. Went for a ride and definitely noticed a bit of pogo activity back there. Back home, I added two oz of Dynabeads and took another test ride. Smooth as can be.
I don't know how or why they work, but they seem to make a difference on my GS.
In a humorous aside, the tire delaminated when I was just a few hundred yards from a Harley dealer. I pulled the rear wheel off, had my wife bring the spare, and I walked into the Harley dealer asking if they would at least break the bead for me so I could spoon off the tire. Not a problem, they said. They'd mount the new tire for me. So I wandered around their immaculate showroom in my one piece Stitch, all the Harley riders staring at me like I was some sort of alien. I looked at all the bikes in the showroom and really tried to like them, but all I could think was "Holy cow, look at all that chrome I'd have to clean!"
About half an hour later the service manager and owner of the dealership approach me spewing apologies right and left. "Sir, we're terribly sorry but we scratched your rim." They escorted me into their immaculate service bay and pointed to a tiny dimple on the edge of the spoked rim. It looked like someone had poked the metal with a pencil. "That's it?" I asked. "Are you sure it wasn't there when I brought it in?"
So there I am, staring at this tiny blemish that had given them so much grief, thinking I live on a dirt road and just assume dings and scratches are part of life, and they are shaking my hand and thanking me for being so understanding and forgiving.
So I left, thinking what great folks they are even if they do dress a little odd. It made me want to add SAE tools to my panniers so I could return the favor someday alongside some remote road.
'07 R1200GS for solo rides
'10 R1200GSA with Hannigan dual sport sidecar for rides with Barley
BTW, even though I like the beads, I don't think they're perfect. You have to be careful with the type of roadside tire repair you use. If you use tire ropes with rubber cement, you need to be careful. If you roll the tire before the cement dries, the beads will stick to the glue on the inside of the tire. I've been using the Neely ropes. They don't require the glue (and I think it gives a better repair).
Last edited by alzyck; 06-28-2010 at 01:06 PM.
This thread is getting funny.
Some apparently want to put stuff in a tire that interferes with most normal plug methods, can cause valve leaks and based on what I've seen from removal by others, grinds hell out of the inside of the tire.
All to do what? Fix a balance issue?
Why not just balance the tire properly?
And throw those Shinkos in the trash pit. Over 2 oz to balance a bike tire is ridiculous. So far, nothing on my RT has needed even close to 1 oz and 2 oz is more than on any of the 17 and 18 inch tires on my autos. If you speak to enough folks at bike and car places who mount tires you will find out that Michelins lead the pack for needing the least weight and having the fewest out of the factory problems re constructions, roundness, etc but many others are also pretty good. (Not surprising- Michelin has typically been the industry leader in tire manufacturing machinery and methods- they invented the modern tire "mini-plant" design, for example. And no, I don't use Michelins on everything or have any direct connection to the firm)
The idea of getting uniform wear on a tire across all surfaces is a great goal but not always possible, especially when tire rotation can't be part of the maintenance. Typically, bad owner habits such as low inflation, poor mechanical maintenance, etc contribute but so do riding habits, tread design, road surfaces and rubber compounds. The first line of defense is keep recommended (usually toward high end) pressures in tires at all times. Harbor Freight has a pancake compressor on sale with a coupon in many bike mags for $40 so there in no excuse not to have one in your garage! That's the first place to spend $ for tire maintenance. For convenience I recommend fitting one of the high accuracy track style inflation gages to it but that's not required- any ACCURATE (meaning properly calibrated and reproducible) gage will do.
Riders, especially tourers, can put tires through extremes during short periods without monitoring pressures. At the track, tires are checked several times a day but a touring rider may start on cold damp roads in the early morning and be on really toasty asphalt by afternoon without any thought to impact on tire wear or pressures, even though tread temps might be 80 degrees different in only a few hours.
If the beads as shown by data extended tire mileage for properly inflated tires they might be worth the possible problems but otherwise why mess with them? What is the benefit that is not more readily obtained by traditional methods?
I didn't go back and re-read all 59 posts, but the argument about dynabeads hasn't been they were a pain. It's been that they couldn't possibly work because somehow they would have to defy the laws of physics. That's just not true.
Over a couple sets of tires, the biggest positive impact I've seen with dynabeads has been on the front tire. Here are my simple data points. I was running BT-020's (I just switched to PR2's). My first set of BT-020's were balanced by the dealer using weights. They felt balanced on the road, but the front only went about 6,500 miles before it was so badly cupped it needed to be replaced. Looking for a solution to cupping is how I found dynabeads. My second set of BT-020's used dynabeads instead of weights. I replaced the second set with 10K miles on them (with the PR2's) in prep for a long trip. I check inflation daily and ran both sets at 36/42. No cupping on the dynabead tire and the front looked like it could go another 2K miles. 12K vs. 6.5K seems pretty good to me, but it's a small sample.
Over the last 5 years (three bikes), I'm thinking I averaged a flat I needed to repair on the road (always on the rear) about every third set of tires. I've gone away from the glue ropes, but for me, waiting for glue to dry once every three sets of tires seems small. If I had more flats it might be a bigger deal.
I also didn't see the inside tire grinding you mentioned. I kept the weighted, worn out set of BT-020's to practice plugging and compared them with the dynabead tires to see if grinding was an issue. There's two liners on the inside of the BT-020's. The inner liner that everyone talks about and then a coating on top of that used to allow the tire to pop off the mold easier. Some of the lubricating liner came off with the beads, but I didn't see any excessive wear on the inner liner. The pavement wore down the outside of the tire way, way faster than anything the dynabeads did to the inside. Again, my experience on a small sample.
FOR ME (notice the emphasis), the little bit of extra pain needed to repair a flat every third set of tires is small compared to the gain I seem to be getting on front tire mileage.