This simple to install conversion kit upgrades your stopping power by up to 20%. The existing 160mm disc will convert into a 180mm full circle type brake disc with this kit. As mountain bike discs use a 6 bolt standard centre hub internationally, you have a choice of either upgrading to a contour disc or full circle. An international bolt 10/08/2013В В· I am just saying that Tektro is a low-end brake and I can't imagine that their hydraulic line is any better. Also depending on the kind of riding you do/rider you are, they will probably be fine until ready to be upgraded. Not everybody can afford or wants to dish out the money for new disc brakes as they are quite expensive. For this reason we