Join Date: Jun 2006
Bikes: 03 Raleigh Professional (steel)
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Well, 6.5mm is the right size. I just pulled one off an Ultegra chain and it was a PITA to get on and off. If your chain tool will expand that far, go ahead. Or you could (carefully!) use a bench vise. I put a micrometer on the shaft and the head and there is a significant difference. Once you get it all the way on it will be fine.
Stupidity got us into this mess - why can't it get us out?
- Will Rogers