We’ve already covered the wheel rims but Erika has emailed asking:

I was wondering if there were any ideas about old bike tubes….

I’m presuming we’re talking inner tubes anyway – it’s quite possible there is another type of bike tube since I’m not a terribly keen cyclist – I live at the top of a steep hill and prefer to tackle it on foot. If there is some other ‘bike tube’, please feel free to answer about both ;)

(Photo by kikashi)