Slime inner tubes.
"Fitted these literally a few days ago. Lent my bike to my Son to try for a day. On inspection I found a thorn in the tyre. Pulled it out and it leaked profusely. Then I forgot that it was stationary. Spun the wheel to move the slime around and it cured itself immediately. It would have done this had I been riding the bike. So yes they work great and do exactly as they say on the tin. Great product and a real life saver if your miles from home."

