Question... I've downloaded the 1988 Suntour brochure and the XC9000 front mech only came in Ø28mm or Ø28.6mm (see pic), I've also found a picture of an '87 SM800 with an XC9000 front mech. So can I assume that a 28.6 will fit my '87 'dale? I'm thinking that it will probably be ok but...
If your seatpost is 27.2mm and the front mech is 28.6mm that would mean a seat tube wall thickness of 0.7mm. I'm not an expert on early Cannondales, but I reckon thats a bit thin for an aluminium seat tube!
Surely it must be 31.8? We already know the catalogue has info missing on XCD6000, so I wouldn't be surprised if the XC9000 info was the same.
Can you measure the saet tube?
Since then I've acquired an NOS Ø28mm front mech and there's no way it's going to fit and neither would a Ø28.6mm, so I'm pretty sure I'm looking for a Ø31.8mm but Suntour didn't offer them in 1987 (at least that's what the brochure says...)
. I got in touch with Melvin to ask him about his SM800 http://www.retrobike.co.uk/forum/viewto ... amp;t=9424
but it’s been sold, so I’m not going to get any info from that anytime soon. You can remove the cage from the clamp by unscrewing the top pivot pin and disengaging the spring; so maybe I could use an XC Pro clamp?