Thread revival! The thread search works!
The sole's of my lavers are starting to wear down and being in Australia its a pain in the arse to get new shred shoes (expensive too - no-one stocks lavers or Climas so with postage they are expensive, and G-units are $100+ in stores), so sole repair is big issue. Ian (King Monkey) took his lavers to a shoe repair place and got them re-soled. I think it cost him $30AU which is way cheaper than getting a new pair, and so far its lasted him at least 6mnths (i think). The dude sanded down the front half of the sole (under the toes and the balls of your feet) and stuck on a new rubber sole.
I am a cheap-skate. $30 is alot of money for me. I am also one of those people who doesn't throw things away. So I have an old BMX tyre that had worn through siting in my room. Rather than spend $30 I cut out a piece of the tyre that wasn't too badly worn down and super glued it to my sole covering all the wear. At first it was really lumpy and uncomfortable due to all the rubber modules from the tyre grip, and because I didn't sand down the sole, and just stuck the tyre onto the already uneven sole. So I got a stanley knife and cut down some of the grip lumps till it felt better.
It lasted about 5 sessions before the glue peeled off, but I'm sure I can get better glue and make it work longer (being cheap, I'll just use up all the remaining glue I have first

).
Weight wise, It is probably about the same as if I had of shoe-gooed them, maybe a bit lighter depending on how much shoe-goo you use. I think it would be comparable to the weight of a new pair of lavers, though I could feel the difference when the tyre eventually peeled off.
The other downside is that my shoes are no longer non-marking, although I only notice the tyre marks on certain surfaces - new concrete. I'm sure you could experiment with different rubber to keep them non-marking
I will post a pic if I get a chance.