First let me say I'm not a current deuce owner, but I'm saving up as I am an Autoshop teacher. My Plan is have my shop class make it a bobber. XM381 gives great instructions. Now to my question. If you go to bigger tires, it should throw off the speedometer. What are you, (owners with large tires on their trucks) doing as a fix? I have tried to search different theads but i guess i need some help as I'm sure this has been asked before.