Bicycle Mechanics - What type of crown race, baseplate do I need with Chris King Headset
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10-04-07, 09:58 PM
I've got a Easton EC 90 curve carbon fork.
Also have threadless Chris King headset that was missing the crown race (baseplate) so I ordered one of the Chris King website. It is a 1" stainless steel headset.
Problem is when I try to put the baseplate at the bottom of the steerer tube, it appears that there is a larger section at the bottom of the steerer tube.
Do I "force" the crown race to the very bottom, or is there a different size crown race I need to order.
Thanks in advance.
10-04-07, 10:06 PM
Crown races are usually a fairly tight fit and need some effort to seat them. In fact several bike tool manufacturers make slide hammers just for this purpose. The Easton fork should have an ISO sized crown race seat so the CK base plate should be the right one.
10-04-07, 10:12 PM
There are 2 standard sizes for headset crown seat OD dimensions (ISO and JIS) but I think almost all modern bikes use the ISO standard.
Is the fork brand new? Is the crown seat machined? The race is supposed to be a press fit onto the seat so it is a tight fit. Some folks freeze the fork and heat the crown race so it just 'drops on'. Other folks use a piece of PVC pipe with the correct dimensions to pound the race on.
If it was me and that was my new carbon fork I'd take it the LBS. Buy a box of bar tape or a couple of new tubes and they'll probably put it on for free.
10-05-07, 08:07 AM
Installing the King crown race requires a King installation tool. It is basically a big aluminum washer that prevents the conical bearing seat on the race from getting damaged. I wouldn't suggest installing it without this.
10-05-07, 08:23 AM
I installed my CK baseplate with a 1 1/8" ID PVC pipe on my 1 1/8" fork, no problems. But with a carbon fork, I'd take it to a bike shop and let them do it for a few bucks-
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