This was possibly the biggest and most important part of this build.Because I'm fitting an 8" wide Mazda car rear wheel, the hub had to be built from scratch.Working out the pcd of the bolt holes was a head-scratcher, as it has five holes. With 4, you can simply measure them. February 25th. I took a rubbing off the flange, and by faffing about with a compass, came up with a 115mm pcd. Turned out to be spot-on.

Because the flange on the hub mounts to the wheel from the hubcap-side, the mounting face of the wheel had to be machined flat (it was convex). All the turning and drilling was pretty straight forward and tedious. 10 hours at the lathe alone. Every surface of the Mazda disc was machined, and modified to accept a GS550 caliper. The disc had to be spaced out 3", and the spacer started life as a piece of 5" solid steel. Any idea how long it takes to drill five 13mm holes through a 3" block of solid steel?

I've had to have a sprocket blank specially made. Over £30 and I still have to machine it.

The profiles are away now, being transferred to CAD before being lazer-cut, so whilst I'm waiting for them I'm going to crack on with the rear mudguard, which is going to be a major feature on this bike.