P-333
I am using the wheels w/o tubes. Never had them in there. Bought it that way. Lead weights are close in to the center of the tire and the bigger the tire the less influence they have, besides they come off wheeling and then they are useless lying on the trail.
The link to the product...
http://www.innovativebalancing.com/index.html
I have found them very good at highway speeds, makes no difference off road as they do not 'form' to their use untill you are going at least 25 mph.
No they do not clump, they are ceramic and even if you manage to get water in the wheels it will not matter. I have had them in for about 5000 miles and really haven't noticed wear. I am running 33'' tires on stock rims.
I did debead at Calico last year when I slid sideways on a rock but had great help from a team of changers get me going again so I did not hold up the group.
Was a great lesson in driving and pilot error syndrom. Can't learn without mistakes now and then.
I had the doors off and the passanger got a real 'treat' when the large rock almost jumped in at him as we slid over. ...good times.
Cheers,