Bob Jackson tandem

Completed, if not finished, this morning.

I have had the frame for about 20 years, but have not ridden it since the mid '90s.
Earlier this year I had some good rides with Gayle on Worrall's tandem, so I decided to build this one up with modern components so that we can shift gears while climbing or sprinting out of the saddle

Fortunately, when I was younger and stupider I had respaced the dropouts back so that a modern rear wheel would fit.

The drivetrain is a Campagnolo/Shimano/SRAM hybrid, with Campagnolo Chorus 10 speed Ergopower and rear derailler and a Shimano Ultregra hub with SRAM PG970 12-26 cassette.
A J-Tek Shiftmate corrects the cable pull of the 10 speed Campag shifter for the 9 speed cassette.
Cranks are Suntour Superbe Pro, rethreaded by Bruno at Cycle Express, on Campagnolo Veloce 111mm bottom brackets.

Chainrings are 52/38, which should give us a low enough bottom gear, but might leave us a bit short at the top end.

Because of the curved seattube, the front derailler needs to be positioned a couple of centimeters further back, hopefully easy to achieve by making an aluminium packer to go between the mounting bracket and the derailler.


The brakes are self-energising cantilevers. Front is Scott SE, rear is Suntour XC Pro.

All the Bob Jackson tandem photos

Honjo mudguards, part 2

After almost a year of procrastination, I made a couple of long mudguard mounting eyebolts, and a suitable spacer out of some lying-about perspex, to adjust the front mudguard line on Donna's Bob Jackson.

Lowering the guard about 5mm below the fork crown means it sits concentric with the wheel instead of higher at the front.

In this photo the eyebolt still needs to be shortened about 15mm
















BEFORE










AFTER

Honjo mudguards, part 1

An unscheduled day off work allowed the time to fit some Honjo hammered aluminium mudguards to Donna's Bob Jackson fixie.
Even with frequent reference to instructions in Bicycle Quarterly and on the Jitensha Studio website the job took a couple of hours, and I'm not done yet.
Both the fork crown eyebolt and the bracket of the rear sliding bridge are too short and the guards sit a little high for my taste, so some custom widgets will be needed before I can call this job finished.