Hey,
The magic slime thing, it is a goo that you stick in your tyres and if (when) you get a puncture it seals the hole. I am also riding an XRV, and use slime in my tyres. I have had some punctures with it and I can say without a doubt it slowed the deflation of the tyre, which could save you rapidly loosing pressure and thus control at the wrong time. It also allowed me to pump the tyre back up enough to "safely " get me and the bike to a place where i could deal with the flat with out getting run over. That alone makes it worth while to me. I dont know if it will stop you from going flat or anything else. all in all for the few £ per tyre it is worth it.
Down side. It can make patching a tube a bit more difficult. yes you can find the hole easier (look for the green stuff). But you do have to clean the tube very well or your patch will not stick.
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