Originally Posted by
garysol1
The Bike:
1985ish Benotto/Columbus SL tubing
Campy SR deraileurs, 6 speed regina freewheel
Friction shifters.
Problem: When I put the hammer down the bike consistently down shifts, sometimes putting the chain between the cogs which makes for a very eye opening moment. What is going on here?
I have checked all the mechanicals. Dérailleurs have no play in them and shift perfectly. The levers are nice and tight. The freewheel has no play. Am I running into frame flex? Any other idea's on things I can check?
Assuming it is frame flex I guess there is not really much I can do or is there?
Do a search for "ghost shift" or "phantom shift". 90% of the time it's related to lubrication in the derailleur cable at the BB guide and in the rear turnaround casing. 8% of the time it's a problem with the keyed friction washer in the shifter not being keyed so much anymore. 1% of the time it's a cracked frame. 1% of the time you're just too big a gorilla to be riding that flexy thing without index or retrofriction levers. These are scientific numbers.