My daughter has a 51cm R5 Cervelo. It has a 128mm tall head tube and she has it set up with a slammed -17° x 100mm stem. This doesn’t give a lot of room for the shift cables to bend when using a standard housing such as Shimano SP41, or SRAM.
After building her bike, she complained that the steering was way too tight. I double-checked the headset and it was perfect. The problem was that due to a ‘too-tight’ bending of the housing, the shift cables pressed themselves very hard into the fork crown.
In fact, they were so tight against the fork crown that each ended up putting a dent into the fork crown. Taking it back to the bike shop, they suggested making the cables a little shorter and rerouting. This didn’t work either since the right shift cable/housing now interfered with the front brake housing prevented the handlebars to be turned to the left.
So, two solutions remained.
First, a very expensive $200 solution (shift and brake) – replacing all of the housing with one of the new compressionless kits like Nokon. With the Nokon system, the housing is able to make tighter bends without pressing up against the fork crown. This is a great system, but a little more than I wanted to spend.
The second solution, which I chose, was to swap the left & right cables/housing where they attach to the ferrules near the down tube. Instead of the right shifter’s cable/housing going down the right side of the down tube, I swapped it so that it was routed down the left side of the down tube. I did the same thing for the left shifter’s cable/housing, attaching it to the right ferrule.
I then crossed the cables under the downtube so that they were again on the correct sides of the cable guide under the bottom bracket. This simple solution gives the housing much needed breathing room and so far, this has been an elegant and inexpensive (i.e., free) solution.
I have always enjoyed bicycling and, through a series of coincidences, became a Bicycle Industry Consultant and Product Tester. I continue to test prototype products for companies and publish only off the shelf production products on biketestreviews.com.