11/30/2022 0 Comments Installing cable guide bottom bracket![]() Photo: Lennard Zinn| 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| 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| 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| 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. Technical FAQ: Installing electronic shifting on a bike without internal cable routing Ultegra Di2 wires running through a grommet into a down tube. When this is the cause the problem tends to be very intermittent and only occurs when standing on the pedals to climb. Some bicycles use a cable guide on one side of the seat cluster for a rear cantilever brake cable, rather than use a short length of housing between two housing stops.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. Despite the advantages this routing is almost exclusively found on older bikes. They do allow use of a slightly shorter cable, tend to keep the cable more clean (as it is more protected from grit thrown up from the road), allow the cable to protect the chainstay from chain slap, and the loop of housing at the rear derailleur does not need to bend quite as tightly, since the cable stop is on the top side of the chainstay, rather than beneath it. Above the bottom bracket Ĭable guides above the bottom bracket are usually made of metal, causing more friction and wear on the cable, and is a more complex cable guide as it does not follow the shape of the bottom bracket shell. Poor lubrication of bottom-bracket cable guides is a common cause of autoshifting. They also make for a cleaner appearance and easier to clean frame in the bottom bracket area. Cable guides below the bottom bracket can be cheaper, just a piece of moulded plastic, and, for some bikes with very small chainrings, eliminate interference between the rear derailleur cable and the bottom of the front derailleur cage. ![]()
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