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Love the Conti protection black chilli and have relegated my Schwalbe Rons and Ralphs to training, replaced by X king and Racekings.Was rewarded with a Raceking protection puncture at Torq 12hr. I find Stans only good for blackthorn etc. Even the smallest cut seems to defeat it until it's been left for a while (ie overnight when you get back).
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http://www.chainreactioncycles.com/continental-x-king-29-mtb-tyre-protection/rp-prod142572 £21.99 also at the moment...
You should try riding schwalbe rubber anywhere flinty like round here. 5 holes in one ride. Never again. Continental ProTection Black Chilli etc has done 3000+ miles no holes though.