Lead

[Cammo]

When I have weighted my KH and R620 rear tyres, I got a roll of Lead roof flashing, sliced it while on the roll into 12-15mm thick strips and then just rolled it into the wheel. No noise of the balls moving around and easy to get the trye on without them falling off, and if you dont wrap up hard you can still have get a little bit of give out of the side walls of the tyres. Different concepot, hope it helps.

Also have used fishing sinkers in the past, if I remember correctly #3 Round first and then infill with #5, but now it will be lead flashing all the way!