a few pictures of disk brake options i had to make the disks used a airheart large mechanical caliper.... there is a direct copy out there... the china rotary looked like junk.....i want to make it stop but if the rear chain brakes your toast the disks i found were for 3/4" you could use a 3/4" shaft and bearings but it looks giant so i reduced the disk to 5/8" by using a sleeve and ran a 3/16" X 1/4" key.... trial and error hope this helps someone
