Full size frame pump, two spare tubes, patch kit with unopened vulcanizing fluid tube, two tire levers, chain tool, three master links, left over from a new chain, Park MT-1, 4-5-6mm hex keys, T-25 torx key, Park SW0 spoke wrench, nitrile gloves. I also bring a spare tire on long rides (> 100 miles).
The frame pump gets a 700 x 25 tire to 90 psi in under 100 strokes so my arms don't fall off.
Flats almost never happen, except during the rainy season when they're frequent so being prepared for multiples is important.
I don't need any tire levers, although two are nice when my hands are cold and could help someone else.
I broke a few chains (weighing 140 pounds, not shifting under load) before the move to flush peened rivets. Since then I haven't broken any, but shifted off my big ring, had my chain form two loops going back on, and bent a link in each loop. Three master links plus spare will get such a chain back to normal length.
The Park MT-1 has a screw driver to put the derailleur in a gear with a broken cable and hex bits; but bad angles so they can't reach everything. 4-5-6 hex keys handle anything that could loosen. The T-25 key can straighten Campagnolo shift levers after a crash.
I've used the spoke wrench to make a slightly bent rim rideable. All my wheels have DT or Wheelsmith nipples so I just need the one size.
I hate riding with greasy/dirty hands so I have the gloves.
Getting a taxi home from 50-100 miles away, perhaps after dark, maybe with no cellular service would be very inconvenient and inexpensive so I bring a spare tire on long rides.
Last edited by Drew Eckhardt; 06-04-16 at 09:21 AM.