This tool checks the alignment of the rear wheel to the front by using a lazer beam. If out you can adjust it correctly with the chain adjuster. The reason for being out is that the mass produced swingarm and adjusters are not 100% accurate and the markings on the side for chain alignment is a very basic way to check wheel and chain alignment.
like all things good, it's simple and very effective.
Please ensure you are a member of the FJ Owners Club before ordering.
Welcome to join on this stie before ordering. see 'Join the FJ Owners Club' in menu