I've the same one as Minky, expensive, but you'll only buy it once, then it moves with you from Bike to Bike.

I covered 8000+ miles with mine, on the Ten in 19 days back in 2008. The longest single ride was 1500 or so miles in 30 odd hours (never again). You can just ride day after day after day.

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Never underestimate the power of stupid people in large groups.