Tubs

Already had these conversations, when the last lot got delivered (tub glue) the lady I sit next to questioned what it was all for.

I explained that the glue is to stick the tire to my rim and the inner tube is sewn inside...

she looked at me blankly,

she does not ask me about bikes anymore...

I've had some "eh" from guys at work. Bar my manager he cycles quite seriously for a cycle club, so he knows what the score is. Though I don't think he uses tubs...