Getting new components for your bikes is always fun, but sometimes the components you get don't exactly fit your bike. Clamps don't always fit perfectly out of the box, so you'll need a shim to make it fit. The Shimano Ultegra FD6600/6603 Clamp Adapter takes your 31.8mm clamp down to 28.6mm so it will fit your bike better. It weighs 8.5 grams and works with Shimano's Ultegra FD-6600 and 6603 front derailleurs.
Shims derailleurs from 31.8mm to 28.6mm
Designs for Shimano Ultegra FD-6600 and FD-6603 derailleurs
Perfect fit. I needed this for attaching a modern front derailleur to a classic steel frame bike. I tried with amazon first but had to cancel my order with them after it did not arrive a month later. With Jenson, my order was direct, fast shipping, correct part for the job. Very pleased.
Earlier iterations had multiple tiny pieces to hold in place during assembly. This version has fewer parts and is easier to install, yet it works as well as the old style. The real solution would be a band clamp on the derailleur that would cinch down over a wide range of tubing diameters, something similar to a worm-screw type hose clamp.
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