Hello, I am pretty new to Weight Weenies, but I got some great wrenching advice here and I want to introduce myself and my Colnago C60 61CM Traditional PLWH bike.
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It’s a bit unusual in that the drivetrain is a combination of Campagnolo and SRAM components. Since I was born a long time ago, and the terrain I ride sometimes includes 20% gradients I wanted a lowest gear ratio comparable to my 2001 Trek 5900 triple which has a 32 largest cog on the cassette, resulting in a .9375 : 1 gear ratio.
I also wanted to bike to be as authentic Italian as possible, so I tried to use a Super Record 11 drivetrain to the degree possible. Of course since Campy doesn’t make MTB drivetrains or road triples any longer, I had to incorporate either a Shimano or SRAM cassette. I calculated that a 36T cog combined with a Campy 34T small chainring would result in a .9444 :1 gear ratio. I was unable to find any Shimano 11 speed cassettes with a 36T largest cog, although there were some with even larger cogs. The only 11 speed cassette with a 36T largest cog was the SRAM PG-1170.
I learned through an excellent article at the link below, that a SRAM (Exact Actuation) 10 Speed Mountain derailleur paired with a SRAM 11 speed Road shifter would work with the SRAM PG-1170 cassette.http://blog.artscyclery.com/science-beh ... atibility/
Here's a pic of the mixed OEM shifters:
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The component list:
*Campy Super Record 11 Ultra Torque Compact crankset, 50/34
*Campy Super Record 11 Front Derailleur
*Campy Super Record 11 Ultrashift Ergopower left shifter (I had to by a pair and use only the left!)
*SRAM Red 11 speed right shifter (these are luckily sold as either right only, left only or a pair)
*SRAM 11 speed PG- 1170 11-36 "Road" cassette
*SRAM 10 speed MTB long cage ”Exact Actuation" rear derailleur
*Shimano Ultegra 11 speed chain
Campy Super Record 11 Dual Pivot Skeleton Brakes
*Zipp Service Course SL-80 Alloy Handlebars (I was unable to find 46 MM C-C bars to my liking from an Italian manufacturer).
*Ritchey WCS 130mm +17 degree Alloy stem (the ONLY white, 130 MM + 17 degree stem I found in 3 weeks of searching!)
Deda Carbon spacers
Deda Handlebar tape
*Shimano Dura Ace 7900 carbon pedals
*Sella Italia SL XC Flow Saddle - Colnago branded
*Wishbone TF82525C Threaded Bottom Bracket Cups for Campy Ultra Torque
*3T Orbis II C50 Carbon Clincher wheels
The unusual rear derailleur cable entry point, without the traditional "loop":
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Wishbone TF82525C Threaded Bottom Bracket Cups for C60 and VR-1:
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Bottom Bracket installed, non-drive side: