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Old 03-28-2013, 04:24 PM   #1
Ron from BC OP
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Old Dyna Beads?

So today thought I'd put some new Heidenau K60's on. Normally I just let the air out of the tires before peeling them off but I thought I unscrew the core of the valve.

So I get the tire off the rim and I see these tiny black beads in various sizes......never seen any debris left in the tire before.



I've had this bike for almost 5 years and changed tires lots....is it possible that these are dyna beads that the original owner had used and somehow got stuck around the valve stem and when I removed the core they became dislodged?

.....and yes those freaking K60 rears have not gotten any easier to put on. I had to wrap a strap around the tire to perform the tourniquet maneuver to get it to keep the air and seat the bead.

Also cut off the oem rubber stem and installed the angled ones.....
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Old 03-28-2013, 05:15 PM   #2
Dan Alexander
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the Dyna's are all the same size.

Are they bits of rubber or harder, Dyna's are hard.
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Old 03-28-2013, 05:20 PM   #3
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Constipated tire mouse............
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Old 03-28-2013, 08:21 PM   #4
Ron from BC OP
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Yep they're hard
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Old 03-28-2013, 09:00 PM   #5
wrysingfeenix
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I've seen the same thing happen with car tires, and a knowledgeable tire shop guy told me it's a very common phenomenon. Any kind of loose debris will "gather" rubber over time and cause those tiny balls of what were, for all intents and purposes, pure rubber. He told me to ignore it; it was of no consequence regarding wear, balance, or safety.

I've been using Dynabeads for years/thousands of miles in Conti Road Attacks, Metzeler Tourances, and TKC80's and have always expected to find those black balls when I change tires; hasn't happened yet. The Dynabeads might have some black on them, but they've never been coated or enlarged. I'm guessing it happens with softer rubber and not with "dryer" harder rubber.

YMMV
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Old 03-29-2013, 07:23 AM   #6
Ron from BC OP
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Works for me thanks.
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Old 03-30-2013, 01:14 AM   #7
ultane
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Someone smarter than me, on this board, several years ago, stated that the little black beads were from the tire overheating during its use, due to either too much weight, or too fast of speed,... or both. As it turns out, I found the same in a well used TKC80 that I had removed after some 'strenuous' 2-up freeway use.




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Old 03-30-2013, 01:50 AM   #8
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Ron from BC-
Pitch the Dyna Beads &
Mount tire/seat beads/break bead approximately 6" length on top side &
install 1oz in front & 1.5oz in rear wheel of 6mm Air Soft Beads in tubeless tires.

Avoid the green or black beads that are biodegradable if using liquid/soap to mount tires.
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Old 03-30-2013, 06:40 AM   #9
Ron from BC OP
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Weight? High speed? Nope....this is the time I've seen this and I started loading my bike lighter on trips during 2012. I rarely go over the posted speed limit which in some of the States I went through last year was 70mph.

Pitch the Dyna Beads? I've never used them....

I'm sure liking the angled (80-90 degree valve stems)
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Old 03-31-2013, 11:31 AM   #10
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The point is, or so the tire 'expert' stated, different tires are rated for different load carrying capacities, as well as speed rated. Under inflation, and overloading can cause heat build up, or going faster than recommended can cause heat build up. If your bike is loaded, add air to the tires. Under-inflation for the load, and higher speeds, adds significant stress to the tire, resulting in too much HEAT generation. This 'heat' is what can destroy a tire. He stated that the little round balls of rubber were an indication that the tire had generated TOO MUCH heat, and a warning that tire failure was imminent at some point while the tire was being used.




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