I bought an old bike with an old tyre on the front the old tyre has heaps of tread on it, it has not worn out yet but its bumpy - lumpy and the tread sticks out on certain parts of the tyre this is a nuisance and on a perfectly flat tar sealed road the front tyre wobbles up and down and feels like there are 20 bits of chewing gum stuck to it. My question is (besides being a nuisance) is this dangerous? Will it cause my front shock to wear out? Will it cause poor tyre performance or a lack of traction? or shall I just keep riding the lumpy tyre until it wears out? Its seems to go away when I go faster And lastly Does anyone know where can I get a cheap tyre? (Sydney) any comments?