Thanks Lee, but as embarrassing as it is, I found the problem; although the tires looked brand new, upon further inspection, they were quite dry rotted. And even more, upon removal of the rear tires, I found that the belts had separated, causing the tires to, well, the best word to describe it is wave, almost as if they had come out of a van gogh painting. So a quick replacement of some rear tires, and it's fixed. But thanks a lot for the info, I will keep it aside in case of future need!!! Scott #16738