Frequently Asked Questions
What are Dyna Beads, and why do I need them?
Dyna Beads are a high-density ceramic bead that, when easily installed, continuously balances your tires as you drive. The amount of material will distribute itself in weight and position dependent on the balance requirements of the individual tire.
The result is a smooth, vibration-free ride, derived from the balancing media that is always repositioning itself as the tire wears.
How do they work?
The basic principle behind how Dyna beads work is based on Isaac Newton's First Law of Physics - The law of Inertia. It states that a body at rest will tend to stay at rest. When there is a heavy spot on a wheel/tire, it tends to make that spot move away from the center when the wheel spins. The Dyna beads are unrestrained inside of the tire, so they tend to stay at rest until the side of the tire opposite to the heavy spot comes along and pushes against them. Once in place against the lighter side of the tire, they balance out the heavy spot. Any excess beads not needed to counter-act an imbalance simply distribute themselves evenly inside the tire as it spins. This can occur repeatedly and continuously as needed as the vehicle travels down the road or trail.
For instance, if the wheel/tire picks up any snow/mud/etc that would otherwise cause an imbalance with a conventionally balanced wheel, the Dyna Beads will immediately compensate and result in maintaining perfect balance.
Why did the computer spin balancer say they weren't working?
For Dyna Beads to work, the wheel has to be free to move slightly to allow for the beads to redistribute as described above. Modern computerized spin balancers use a fixed axle which prevents the wheel from moving and senses imbalance using strain gauges on the fixed shaft. On such a machine the Dyna Beads simply distribute evenly inside of the tire and cannot function as designed.
Will Dyna Beads void my tire warranty?
Not that I am aware of. I have reviewed the warranties of all major motorcycle tire manufacturers, and the only mention that I have found is reference to liquid sealants used inside of tires as voiding warranties. However, Dyna Beads are NOT recommended for use in track/race tires. The inner liner on those tires is softer and subject to scrubbing wear from the beads, particularly with the hard braking that is done during corner entries.
Why not just put sand, or BB's or water or anti-freeze inside my tire like I have heard of others doing?
Dyna Beads are specifically designed for this application, and as such are very uniformly round and hard. This reduces friction to allow them to flow freely inside of the tire and prevents wear on the inner liner of the tire. They also will not absorb moisture and will not clump if there is condensation inside of the tire. Sand is a very abrasive and irregularly shaped media and will quickly wear away the inner liner of your tire, which is designed to hold in the air. The rest of the rubber in your tire is actually somewhat porous, so you will find that your tires will be losing air pressure regularly. Sand, powders, etc. will also clump together and not flow properly if there is moisture inside of your tire. BB's, marbles, etc. are much softer material than the ceramic used in Dyna Beads, meaning that they will deform quickly. Marbles will fracture, leaving shards of glass inside of the tire, BB's will rust in short order binding together and leaving abrasive rust residue to wear away the tire liner, and none of these media are as dense as the ceramic used, meaning they are not as effective at counterbalancing as an equal volume of Dyna Beads. And none of these can be installed through the valve stem the way Dyna Beads can!
Liquids used inside of a tire present other problems. From corrosion of your wheels/rims, to possibly reacting to the rubber of the tire, to interfering with the ability to patch/plug a puncture, and of course, most tire manufacturer warranties are void if they discover that a liquid sealant or balancing agent was used inside of their tire...
Should I leave the wheel weights on if adding beads to an already balanced bike tire?
NO. Because rubber is a mixture and somewhat 'lumpy', the balance of your tire changes as it wears. Leaving the weights on the rim will just add additional imbalance as the tire wears and changes. Not to mention, that clamped on weights are usually on only one side of the rim, rather than along the center line, imparting a lateral imbalance to the wheel assembly.
My tire size is on the cusp between two weights, is it better to go with the higher or lower recommended weight of beads?
Excess beads inside of a tire simply distribute themselves evenly inside of the tire, and have no detrimental effect. If you should pick up some mud/dirt/a stone in the tread on your wheel or tire, the extra beads would then automatically redistribute to compensate for the added unbalancing weight to maintain perfect balance. That is why we recommend an extra 1 ounce for off-road riders. So if I were choosing between two weights for a given tire size, I would personally always go to the heavier size to give that margin of safety.
Can I use Dyna Beads with tubes?
Yes you can! In fact, using Dyna Beads with a tube makes it extremely easy to reuse the beads when changing tires! Either reuse the tube with the beads already installed, or turn the tube so that the stem is at the bottom to pour the beads out into a container to put into your new tube. If you don't plan on saving the old tube, you could also simply cut it open and pour the beads out as well.