Join Date: Apr 2009
Location: New Rochelle, NY
Bikes: too many bikes from 1967 10s (5x2)Frejus to a Sumitomo Ti/Chorus aluminum 10s (10x2), plus one non-susp mtn bike I use as my commuter
Mentioned: 45 Post(s)
Tagged: 1 Thread(s)
Quoted: 1746 Post(s)
Start by checking that the wedge thread and exterior is smooth and well lubed. Test it by turning the nut with the stem out of the bike. The wedge should draw in and flare the base without much torque required. If it doesn't, dis-assemble the wedge and bolt, and see if possibly a burr in the conical ID of the stem is blocking the movement of the wedge.
When the stem is OK, assemble it into a clean steerer, with only a light film of grease or oil.
You shouldn't have to do this, but you can also increase the holding power by coating the outside of the lower area (where it flares) with coarse lapping compound.
An ounce of diagnosis is worth a pound of cure.
“Never argue with an idiot. He will only bring you down to his level and beat you with experience.”, George Carlin
“One accurate measurement is worth a thousand expert opinions”
- Adm Grace Murray Hopper - USN
WARNING, I'm from New York. Thin skinned people should maintain safe distance