Here we go. I used a big allen key, a 19mm socket, a pair of Hi Spec R-132 calipers, Hi Spec brackets for Cossie hubs and a set of Ferodo DS3000 pads. It took about 45 minutes for the first side and 15 minutes for the second side:

1. Original wheel with standard 2WD caliper


2. Wheel off to reveal newish disc and standard caliper


3. Disconnect old brake line and attach new braided line


4. Remove original caliper and compare to the HiSpec R-132 to see size difference



5. Compare standard size pads (above) with pads for R-132 calipers (below)


6. This bracket mounts the caliper to the hub


7. Turn the steering so that you can mount the bracket


8. Bracket on


9. Mount the caliper to the bracket


10. Attach the braided line


11. Put the wheel on to discover that it does fit but only just and I had to take the wheel balancing weights off the inside. Not sure what to do about this at the moment.


12. Go to the kitchen. Original Cossie caliper with pads weighs 5.3KG (scale has gone right round past zero)


13. Hi Spec brackets and DS3000 pads weigh 1kg


14. Hi Spec calipers weight 2.5kg



So there you go. I haven't raced on them yet - first race is in June - but they should do the business and they fit under standard wheels. It saves 1.8kg per wheel in unsprung weight, gives you a bigger braking surface area, should diffuse heat quicker and didn't cost too much.

Charlie