We have 50 cyclists at work, out of 170 people. When I started the spares were the odd tube on a desk, perhaps without holes, and the only tools in the place was a floor pump and about 60x 6mm hex drivers.
I had a cleanout and rationalise at home, and brought in some surplus screwdrivers and so on. Other people have done the same, so there's now a work toolkit which is woefully incomplete, but cost nothing.
I also put two cardboard boxes on the table, one labelled "dead tubes" and one holding "good tubes" We periodically take the bad ones home and patch whatever is reusable, then return the okay ones to the good box.
We're lucky in that 1 of our 4 floors is unused, so its a huge area for bike storage.
- Cable ties - cos they're good for a lot of things.
- a range of normal sized spare tubes. Staff take one and replace it in the next couple days. 700c 18-25, 700c 28-34, 26" 1.5-2.25, 29" 2-3 would be the four "common" sizes, but depending on your population you might choose to strike the 26" and the wider 700c. Look for multipacks of tubes from somewhere like Wiggle to get stocked up. Don't buy expensive tubes for stock.
...and that's all. People will "forget" to replace them, and its not necessarily the low-paid staff!
- A reliable floor pump, that does both presta and schrader.
- Some philips and flat screwdrivers, possibly some torx ones.
- Crescents / adjustable spanners OR some ring spanners of suitable sizes.
- Pliers (sideys / dykes / something for cutting wire)
- Tyre levers
- A spoke key
- Allen/hex keys of various sizes, probably metric 2/2.5/3/4/5/6/7/8/10 mm Maybe skip the 7mm one, that's a weird shimano size on some road bikes.
- Floor covering, if required. We have big blue tarpaulins taped to the carpet, for wet-day storage/protection.
- A table - something ugly that can get scratched up. Or a table covering - we use 4 carpet tiles taped together.
Why no more tools? Why not a repair stand? Work is for working, its not for fixing and servicing your bike. The tools at work are just enough to fix up common road problems without carrying onto a full service.
Notice there are no oils or lubes or cleaners in my list? That is because there's always one person who doesn't think, or fails to clean up and ruins it for everyone. Imagine oiling a chain inside?, and the mess it would make on carpet.
I observe that the suggested tools listing is pretty much exactly what's in my on-bike toolkit, except for a chain breaker and some master links, and a presta/schrader adapter.