

A 27 1/2" tube is not really the same as 700c. 622/700c is a pretty common size that has a bead seat diameter of 622mm. 27 1/2" is a rare Danish size with a bead seat diameter of 609mm. Tubes fit a range of sizes for a specific diameter tire; the 26" tube might fit the 26" tire, but you need a 700 x whatever width range covers your tire width for the 700c wheel. For example, Conti makes a 700x32-47c that fits a 700x45c tire.
Further complicating things, fractional tire/tubes are not the same as mathematically equivalent decimal sizes: 26x1.75" is not the same as 26x1 3/4".
If you want a really good explanation, check out Sheldon Brown.







USA, Virginia: My county does not have municipal trash collection, so we either haul our own trash to convenience centers, or pay a private service to pick it up. The landfill and convenience centers are run by a private company and it seems to work pretty well, except for recycling. The county only recycles paper/carboard, metal, and #1 and #2 plastic, and for #2 plastic the opening of the container must be narrower than the container. We don’t recycle glass or any other plastics. Apparently my neanderthal neighbors couldn’t be arsed to rinse out the containers and the people whose job it was to sort it out refused to accept any more recycling from us until we made changes. And most of the county still just tosses everything in the trash compactors. I think our county-wide recycling rate is just under 25%.
I like the system better than when I lived in a city where we had trash pickup. I can go drop off when I need to instead of missing trash day, having trash pile up waiting for trash day, or having it not picked up because it was “too heavy,” or some other reason. It doesn’t cost me anything other than gas, and we can usually combine the drop off with grocery shopping or other errands. I just wish we were better at recycling. My daughter lives in a city with single-stream recycling - all the trash and recycling goes in the same container and it gets automatically sorted at a processing facility.