The local mechanic who replaced my motorcycle tyre tube added what looked like talcum powder to the insides of the tyre before inserting the new tube. I asked him the advantage of doing that and he didn't know for sure. He just said it helps the tube move freely in the tyre. Sounded like nonsense to me, so I Googled it.
There were three opinions I came across:
1. Talcum powder does not help at all
2. It helps reduce friction between tyre and tube
3. It prevents the tube from vulcanizing and sticking to the tyre when it gets too hot
Are any of these reasons credible? Which is the real reason for using talcum powder?