When I first started running a trials tire, on my '01 XC300, I found that the tire/tube would creep at anything less than 12 psi. And that was using 2 Motion Pro rim locks with a Bridgestone UHD tube. On my '03 EC300 I'm back to using one MP rim lock and 12 psi. Yes, with lower pressures, a trials tire gets a lot better grip, but you have to sacrifice some of that "exceptional grip" since trials tires aren't really designed for enduro bike applications.
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