Thanks! and that's pretty impressive. Maybe I won't nerf the biker after all. You're never supposed to get the bike if you beat the biker, just the speedo. I didn't want to lock actual game progression behind something so hard.
Rob sells you the speedo because he was a testbed for the merchant system when I was originally coding it. I stuck the speedo in his inventory and just forgot to take it out. I'll remove it eventually.