It depends what kind of riding you're doing; if you get a flat, can you
walk home?
On all my rides out, I have a Topeak Alien tool (allen wrenches, tire
levers, sockets including 10mm for the main cap bearings, screwdrivers,
and bottle opener), a patch kit, and a portable pump. If I'm on my
Profile setup I'll also have a long-handle funky Allen key to tighten
those bolts. Generally for MUni and for group rides I'll bring along a
spoke wrench (saved my butt when I tacoed my wheel in Moab in 2003). A
5" vise grips can replace almost any other tool in a pinch, so that's a
good one to have.
At home, you'll need grease, a crank puller, pedal wrench, 10mm and
14mm sockets, and probably a hacksaw as you collect more unicycles with
inappropriately-sized seatposts.
--
tholub
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