some people put bigger/small tyres on to make their bikes turn faster/slow , some for show , as the the tyre heats up it gets bigger hence catching huggers swing arm etc and the big one the wheel not been wide enuff to take the bigger tyre and it mushrooms the tyre on the rim , I would think you could get a 160 on find out how wide the rim is and see if anything with the same size rim has the bigger tyre fitted