I'm after a bit of advice about off-road tubes for an @.
Got some off road tyres for an upcoming trail ride, and asked the wheelman to fit heavy duty tubes. The tyre supplier advised against the 4mm tubes unless they were strictly used for off-road only. He also said the medium type (2.5mm I think) should only be used on the road at limited speeds (he said 30mph or so). For normal road speeds only the road type 1.5mm was recommended, as the thicker ones will overheat. He was quite adamant about this, so I was reluctant to quiz him further.
I'm sure members here have used thicker tubes on the road, so what are your experiences, and views of this advice? *rse covering caution, sensible and accurate, overly fussy or complete bollox?
I'm planning a longer foreign trip, mixing on and off-road, and was hoping to use heavy duty tubes for the whole trip. I don't fancy changing tubes every time I leave the tarmac. Help.