Had the question many times. What's my method for tire balance and how many miles does each tire yield. The short of it; Yes Dyna Beads work, no there isn't a down side, yes, it helps tire mileage. I buy the kit(s) from Whitehorse Press for $ 12.95. That balances both tires. The tires on my thumper are getting 12K-14K miles, which at $119.00 a pair shipped, really makes my riding cheap. Gone is the constant bounce from the 21 inch hoops & no cupping. I've used this method for the last 16 months, putting 62K miles on my KLR in that time. Same results with my 99 connie, but just not putting much for mileage on it anymore. If you have this done at a shop, remember, your balance job depends on the amount of time your technician spends on the process, and how good a quality the bearings and stand are. Chances are, you're not getting the best job that can be done, and it's going to be more expensive than twelve dollars for the pair. Try it.....you'll like it.