Do you think it would be worth trying some silicon bath sealant, like the old days, used to work a treat on the wood floors back in the 80's....squeeze out a good load onto some cardboard (sounds pervy), roll tyre in silicon (with optional facemask due to overpowering vinegar smell) and leave for one hour... voila, one polished wood floor tyre!....although we were on mabuchi 540 power then!
