Doug The cassette is an Ultegra 12x27. The rear derailleur, to anticipate a question, is the long cage Dura Ace 7700GS. The original tyres were Mitsuboshi Trimlines. It is currently wearing Michelin World Tour 650 x 35A. Could only find an ancient review of these online, where I believe they were memorably described as "pitiful". They are certainly sturdier than the Mitsuboshis, but although I may have felt they weren't as fleet as foot at first ride, I suspect it was psychological : I'm not any slower. They were a $&¥£€%##^ nightmare to fit on the rims, but once on, I have no complaints. No punctures, no dramas, and tread still looking good after 2 and 1/2 years use. World Tour indeed.
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