I slime my tires and have never had a problem, but i ride in the street.
I had kevlar liners 20 years ago when i was a bike messenger in San Francisco and they worked great.
recently i picked up this groovy little "army knife" and pack, now it goes with me whenever i ride. it has wrenches, allen wrenches, phillips driver, spoke wrenches, tire spoons, and a patch kit.
i added the adjustable crescent wrench and small phillips, which all fit in the pack (sort of)
I agree, Frnk n Furry, planning for any contingency seems to make the need almost never arise...
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