Here we have some assembly shots. the tricky thing about the rear brake is SPACE. theres a finite amount of it back there. as you can see in this picture, a kings offset sprocket with a large (1/4" ) offset top-hat, and the disc rotor is spaced away from the tophat with those 5mm kit washers. The problems that arise are 1) CHAINLINE- with so much offset, the sprocket is kissing the spokes. so 2.5" tires make chain alignment tough. thin chain helps this, you'll notice. 2) CALIPER CLEARANCE: the fatness of the caliper puts the adjuster nut (featured center frame 2nd photo) right against the sprocket. with a 40t sprocket and 160mm rotor, the orientation of those sizes is key, as the adjuster nut would hit the chain if the sprocket was any smaller. the adjust nut rides just under the chain. 2thou clearance!!! (photo 3) [recall the gold "SKYHAWK GT BUILD" Where we mentioned "aircraft tolerances, gentlemen" ?]. This bike is a replica in different skin. The solution to all this- make a better bracket; one with an offset to kick the caliper out to the left and allow for the caliper hangers' thickness to not rub the rotor. the design i came up with is like a 3 layer design platform made from one solid piece of 7075 aluminum. the key is keeping the axle mounting portion just under 1/8" so the dropouts and frame dont get stretched too far out and hide the axle threads.
Then, the caliper mount gets wide and protrudes outside the frame dimension width. the brake mount portion of it is cut away for the cal. hanger.
fairly intricate piece. if you need mounts to do this type of thing, we will be making a production run this week, and they'll be for sale on shop.jakebike.com, and KWmachine
