in the last day my front wheel has been squeaking on every turn, when im slowing down it gets louder, i'm not sure if its because you cant hear the engine or what. also my back brake squeaks when braking at low speeds. i have searched the forum and found some answers but just double checking. i know it could be the wheel bearing. the front brake is now starting to make a noise as if the tyre was flat? perhaps the noise of a bicycle tyre.. the front tyre is almost worn down. help is it safe to ride ?