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A question for all EC70 Fork users(5 posts)

A question for all EC70 Fork usersSkidoo
Dec 7, 2002 9:12 AM
What brand of headset did you use?

I'm installing the fork with a diacomp aheadset and it doesn't fit well at the lower cup due to the longer than typical bulge at the bottom of the steerer tube.
I'm sure the cups and bearings are installed properly (had LBS check it). I believe it has someting to do with compatability issues with the headset.
Hmm...I had no troubles with a CK one...IAmtnbikr
Dec 7, 2002 12:54 PM
Are you sure that the race is seated square? It takes a bit of effort to install one. I have an aluminum part machined to do the trick. Just be cautious when hammering it down. I used a block of wood that was heavily padded under the crown to support it. Is the fork the alloy steerer one? That is what mine is. If all else fails look at the CK website, they list the spec. for the steerer tube nominal OD and headset race ID I believe.
Check crown race seat diameterKerry
Dec 8, 2002 4:52 PM
The crown race has to match the crown race seat diameter of the fork. Sometimes, forks have not been properly prepared and there is paint, etc. on the crown race seat. Check that the diameters match and that your fork was properly prepared.
Do a search on EC-70the other Tim
Dec 8, 2002 5:54 PM
This has been discussed before. The crown race seat area on the EC-70 is apparently taller than it needs to be. Suggestions were to file away the excess aluminum on the steerer tube, or to remove metal from the inside of the lower cup. With caution, either should work. If I absolutely had to have that combination of fork and headset, I would probably do the latter on a lathe.
re: A question for all EC70 Fork usersMR_GRUMPY
Dec 8, 2002 6:30 PM
I had the same sort of problem when I tried to use a Ritchey WCS headset. The inside dia. of the lower cup interfered with the area just above the crown race. The shop where I had the headset installed had never seen that problem before. I had them send the WCS headset back and had them order a King headset which installed without a problem. Some headsets must have a smaller I.D. on their lower cups. EC70 forks must have a larger than normal O.D. of the area above the crown race. The interference wasn't a lot. Just enough for metal to metal contact.