OUT OF STOCK, AND AWAITING THE NEXT PRODUCTION RUN. 
Message for delivery date

The "Fairmont" water pump pulley as described in Cooling the Sunbeam Tiger" paper, and its addendum, by Tiger Tom and Chuck King. I have added a second sheave added for those that want to run air-con or power steering.

To quote the Authors:
"The Fairmont pulley produces a significant temperature reduction at idle. Combined with an efficient fan, this produced more gains than some radiators tested."
I tried all the common mods set out out in the referenced paper, and this pulley helped the most in solving my Tigers overheating issues. Not the cure all for Tiger overheating, but a huge help.

CNC machined from a single billet of 6061 T-6 aluminium. With the proper Tiger backspacing it is a direct replacement for the stock pulley.

A knock out bushing allow fitment to both the stock Tiger 1" fan flange, and replacement water pumps with a 5/8 shaft.  
Reinforced in the hub area, where to stock fan is known to fractore