Join Date: Apr 2007
Location: Syracuse, NY
Bikes: 2008 Novara Randonee - love it. Would have more bikes if I had time to ride them all. Previous bikes: 1968 Motobecane Mirage, 1972 Moto Grand Jubilee (my fav), Jackson Rake 16, 1983 C'dale ST500.
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Replacement cones do not have to be an exact match, but there are critical dimensions, as follows:
1. Threads must be the same of course.
2. The OD of the cylindrical part must be slightly less than the ID of the dust cap.
3. Measure the diameter at the circle where the bearings ran with a caliper. That same diameter should fall somewhere on the cone area of the replacement, the closer to the center the better.
4. The distance from the line where the bearings will run on the cone to the wrench flats must be at least as large as the original, so that you can adjust the bearings once mounted.
In desperate times you can do such things as grind out the dust cap to a larger ID, peen out a dust cap that is too small in OD, eliminate a spacer when a cone is too long, etc.