XCProMD - I've got a few questions that maybe you can help me with?
I saw your post on MTBR saying that the spider on the Shimano cassette had been milled to suit the 2.25mm Campagnolo spacer thickness - Can you tell me what rivets/bolts were used to put the cassette back together? I assume the smaller cogs with 'built in' spacers also get machined?
Any mods done to the freehub or lock ring for the wider cassette? Do you know how much of the smallest cog cantilevers over the end of the freehub?
Did the RD or hanger require any mods to suit the large cogs and capacity of the cassette (looks like maybe a different top pulley?) - or just standard short cage RD?
Sorry, not around for a while.
We're currently using our own rivets. They are made in two coaxial parts, snug fit. The inside part is assembled from the right droput side, the outer from the hubshell side. When they're pressed together, the outer part made of soft 2000 series aluminum becomes a tight fit against the spider hole. Good results until now.
Previously we had used M3 stainless countesink head allen bolts + nuts, but we had to machine the nuts (hubshell side) to get enough clearance. Stainless suffers from galvanic corrosion when bolted on alu, that made the assembly safer. It didn't look great though.
I can tell everything fits (the whole 11 cog assembly) without mods on Mavic Crossmax Wheels until 2011. Don't know about 2012. The reason is Mavic freehub is wider than a standard Shimano-Sram unit. They used the extra space to fit a spoke protector. When that protector is not in use, a spacer in needed to fill the extra space.
Apart from Mavics all test are being done with our own prototype hubs. Again, the freehub is a little bit wider than Sh-SR and we're testing too an integrated spider that carries the frewheel pawls.
The RD will work with cogs up to 36T just by swapping the top pulley by a 9T. Right now we're able to shift to a 40T rear cog (yes, a massive one
) usng a cage that is our own design. This cage allows not only to reach enough clearance for a 40T (it shifts a 42T actually, but no tests aside the workshop so far), but it also takes care of offering the right chain gap on smaler cogs (as small as 9T
) Mind you that the Campagnolo RD has less slant than a SRAM Exact Actuation or a Shimano Shadow. I promise I'll post pics of the cage when the patent is filed.
I wonder if there is anyway you could modify Campagnolo flat bar shifters to suit?
As far as I know Campag Flat Bars are just 10 Cogs. So they could be "G-Springed" shifters as top of the range 10s ErgoPowers or Escape (I'd bet on Escape). Both cases a 11S retrofit seems difficult. For G-Spring there were some guys doing a 11s ratchet. Escapes could be 2011 Athena Ultra-Shift 11s internal compatible, I don't know. Anyway we needed hidraulic brakes so we took the way of modifying SR Ergos. We have modified too Campagnolo new TT shifters and they're fantastic! Light, tiny, crisp shifting...
I have to say Campagnolo's system performs astonishingly on MTBs. We're using it on such bikes like Yeti 575, Corsar Marque and our own 170mm travel prototype frame, apart from our R&T frame, and all we can tell is it works at least as good as any ther system out there. Really mpressive how tough the SR RD is , considering the weight.