Cleaning the cable run and using a teflon coated shift cable won't hurt and might alleviate the problem if it's a combo of bottom bracket flex and sticky guide. When this is the cause the problem tends to be very intermittent and only occurs when standing on the pedals to climb.
Technical FAQ: Installing electronic shifting on a bike without internal cable routing Ultegra Di2 wires running through a grommet into a down tube. Photo: Lennard Zinn| VeloNews.com Technical FAQ: Installing electronic shifting on a bike without internal cable routing The Ultegra Di2 wire’s 5mm connector easily fits through the 8mm-by-7mm frame hole; the grommet pushes in, upper edge first.
Photo: Lennard Zinn| VeloNews.com Technical FAQ: Installing electronic shifting on a bike without internal cable routing Large holes from the down tube, seat tube, and right chainstay into the bottom bracket shell are necessary to allow internal electric wire routing. Photo: Lennard Zinn| VeloNews.com Technical FAQ: Installing electronic shifting on a bike without internal cable routing A large hole into the right chainstay into the bottom bracket shell that is inset enough that the bottom bracket bearings won’t cut the wire is necessary to allow internal electric wire routing.
Photo: Lennard Zinn| VeloNews.com Technical FAQ: Installing electronic shifting on a bike without internal cable routing A standard 8-by-7mm Shimano grommet on the seat tube for an Ultegra Di2 front derailleur wire. Photo: Lennard Zinn| VeloNews.com Technical FAQ: Installing electronic shifting on a bike without internal cable routing Dura-Ace Di2 wires have a 9mm waterproof connector on one end and a 6.5mm non-waterproof connector on the other with O-rings at the base of either connector (they just slide around on the wire) that work with the heat-shrink tubing you have to shrink on over it to seal water out. Technical FAQ: Installing electronic shifting on a bike without internal cable routing Wire passing through a non-standard grommet on the seatstay to an Ultegra Di2 rear derailleur. Photo: Lennard Zinn| VeloNews.com Technical FAQ: Installing electronic shifting on a bike without internal cable routing Campagnolo EPS interface with wires emanating from it, showing both male and female EPS connectors. Photo: Lennard Zinn| VeloNews.com Technical FAQ: Installing electronic shifting on a bike without internal cable routing Campagnolo’s super-cool internal-wiring magnet kit’s lead wire has a standard 6mm EPS female connector on one end and a magnet on the other.
Photo: Lennard Zinn| VeloNews.com Editor’s Note: Lennard Zinn’s regular column is devoted to addressing readers’ technical questions about bikes, their care and how we as riders can use them as comfortably and efficiently as possible. Readers can send brief technical questions. Dear Lennard, With the hype of electronic shifting dying down and the reality of great performance being proven, I’ve a couple questions, which I think many others have. 1) Are framesets designated Di2 framesets also compatible for EPS? 2) For those of us who want to upgrade to electronic shifting but don’t have a frameset with internal cable routing (and can’t afford to buy a new frameset because of the purchase of Di2 or EPS) can you give a bit more insight than that offered in the blogosphere of how to adapt for the upgrade? Perhaps examples of externally routed cables as well details on how to drill holes (what tools are necessary and the such) into carbon fiber framesets to internally run cables? — Van Dear Van, The answer to question No.
Campagnolo followed the published Shimano frame specifications for Di2 wire holes, which is 8mm by 7mm on the frame holes. The hole between the water-bottle bosses for the battery wire is 14mm by 7.7mm. Original Dura-Ace 7970 Di2 has four-conductor wires with large, waterproof connectors at the derailleurs, shifters and Junction A (the junction box at the front with the two indicator LEDs on it). Ultegra 6770 Di2, on the other hand, has two-conductor wires with small connectors on both ends. The size of EPS connectors is halfway between the two Shimano connector sizes.
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