All you need to do is get a quart of aviation fuel tank sealant. It is a two part deal like epoxy. Or do an online search for flexible epoxy. Clean the inside of your rims, score them a little and spread the epoxy with a plastic bondo spreader that is cut to fit the inside channel of the rim. This is tried and true. However, I am not responsible for what you do or the result of your application of the aforementioned information. Use at your own discretion.
Please explain this. I know about loading up the front end when braking. I don't understand what you mean by adding unsprung weight. Do you mean the weight of the sealant? How would this differ from getting new 80 spoke wheels to replace 40 spoke wheels?
Unsprung weight? The weight of components not supported by the suspension..spent a lot to reduce mine, but you have to be after improved handling to bother going as far as I did. Sputhe aluminum swingarm, aluminum rims with SS spokes and composite rotors. Yes, I can feel the difference. See pics under "Modifications to your Dyna".....
Along the same lines here....I want radials for all the obvious reasons....cars have used them for about 200 years now....I would like to retain the stock spoked rim on my 05 Deuce and see nothing above that seems reliable and inexpensive. I have seen in searches that there are people who seem to be running tubes in their "tubeless" tires. Any experience to add here? John