Friday, August 12, 2011

Heavy Duty Drum Brake Hubs

I have been having trouble getting the correct tooth count and offset sprockets for the large drum hubs I use.  Finally I just had them made.  These sprockets use an adapter plate that carries the drum brake bolt pattern and then I went with split sprockets to make gearing changes easier.  The split sprockets use an standard bolt pattern used in Kart and Jr. Dragster racing.

Here are the hub components.  Stock sprocket is shown to the left, adapter in the middle, and new split sprocket on the right.

Here is the hub assembled with the new adapter and sprocket.  Also shown is the bicycle side freewheel sprocket.

Revised BTR Handlebars

I have continued to improve my BTR style handlebars and here is the latest version.  It took awhile to settle on the right combination of parts to get the vintage Indian motorcycle shape I was after.

The handlebars are aluminum and the drop bar clamps are CAD designed and CNC machined out of billet aluminum.  These bars are light weight and very strong.

Here is a close-up detail of the drop clamps.  The CNC machine work is perfect!  Bars are available in silver powder coat or black.