Convertible mbb to fbb

 

Current moving bottom bracket bike with proposed fixed bottom bracket piece clamped alongside.

Bottom bracket position will be traced onto the new frame piece.

Overall view

Not sure if its discernible here, but the bottom bracket looks slightly askew.

Current bike with a bottom bracket / pedal mount that moves when the steering moves - moving bottom bracket front wheel drive.

New proposed version where the chain twists during steering, and the bottom bracket is secured to the main frame, so stays fixed during steering - fixed bottom bracket front wheel drive.

 

 

Hi

After a while spent riding a new front wheel drive moving bottom bracket bike, I have decided to make it convertible between fixed bottom bracket and moving bottom bracket. There are a few reasons for this.  One is that the current bottom bracket seems to be attached crooked, and one style of fix for this could include making it removable. The second is that I can, and the third is that a comparison of moving and fixed bottom bracket bikes should be interesting.

 

To take these photos I stripped out the bike's pedals and pedal bearings. The next job is slightly off topic, there is currently only one brake and I plan to fit another - a set of v-brakes at the back of the fork. Will report more soon!