XP6 was world cup frame, XP8 and XPX were a new world cup frame with extra gusset on down tube and no rear brake pierce and better componentry when built up. I am led to believe they were a UK only option and are essentially an 856. I have the brochure that was on offer over on ID Riders if you'd like it, PM me your email address and I'll send it.
I have an XP-8.
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"Going that fast, I'm sucking foxes out of hedges!"
"I washed it recently. I think it was in 2005..."