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Carbon fork installation. Any mechanics out there?(8 posts)

Carbon fork installation. Any mechanics out there?whoopicat
Jun 8, 2003 10:32 AM
I'm replacing my old steel threaded fork with a Look carbon threadless. I can't get the bottom fork crown race to seat on the fork. It looks like I might have to file the fork's crown race just a bit. Is this a normal thing to have to do? Is this a bad idea? Any input would be helpful. Thanks.
re: Carbon fork installation. Any mechanics out there?Atombomber
Jun 8, 2003 11:24 AM
Park makes the tool you need.

Contact your local bike shop to see if they have one so that the proper tool is used. Using a file is tricky, but possible if you don't have access to the tool. Be careful though.
What kind of bike?Spoke Wrench
Jun 8, 2003 1:35 PM
"Old steel threaded fork" says 1" to me. There are actually two different 1" crown race sizes, 26.4mm and 27.0mm. The problem I have with that is I would expect the Look fork to use a 26.4mm race, the smaller of the two sizes.

The first rule of bike wrenching is (or at least should be) "Do no harm." I think that I'd find somebody with some accurate measuring devices before I started grinding or filing on anything.
Second this opinion!mja
Jun 9, 2003 3:43 AM
Measure first. (And calipers and micrometers are not expensive.)

Then once you understand what the problem is, you will know how to proceed, or at least be able to discuss the problem intelligently with an LBS.

One more thing: A bit of sandpaper will be quite effective on aluminum and a lot safer to use than a file.
re: Carbon fork installation. Any mechanics out there?flakey
Jun 8, 2003 2:22 PM
Try to just file the very top edge of the fork crown race seat. Do not file the entire seating area. Maybe its the sharp edge of the fork crown area that is impeding your install. Once you file the very top edge ,use a little grease to help. Also be careful not to pound on the race with the fork tips on the ground or a bench. Either hold the tool in one hand and the fork in the other, or if the tool is long enough (PARK), put that on the bench and then hold the fork blades in both hands and pound the fork into the tool. I used to sell a lot of TIME forks and this way always worked for me. IF it still doesnt seem right and wont go, dont force it, wait til Monday and take it to a shop. Good Luck!
Jun 8, 2003 4:28 PM
The chances of you making your crown race seat go out of round or off center with your hand filing are high. If you're sure that you have the right crown race diameter, then you should have the fork done by a shop with the proper tools. As mentioned in another post, if you just have a lip at the top of the crown race seat, you could file that down. Alternatively, you might have the right crown race, but have a bit of paint on the crown race seat. Also mentioned in another post, there are two crown race seat diameters (27.0 and 26.4mm) and if you have the larger, then you'll not get the smaller one to go on without the proper tool (shown in another post).
re: Carbon fork installation. Any mechanics out there?paul3d
Jun 8, 2003 5:22 PM
I just added a cane creek race to my 1" Look HSC3 and did not need any alterations. Both were 26.4 in size. I would be sure that your using the proper installation tool(I used the Park). I found the race went on much easier than when I tried the same race on a Time steel steerer.
I would bring it to a shop if you have doubts.
good luck
had this problem with an Alpha Qterry b
Jun 8, 2003 5:25 PM
I think I understand what you're describing, if so - here's what I did.

I have a very nice pair of Mitutoya digital calipers that I used to discover that the shaft of the fork was out of round at the bottom (and out of spec, albeit by a few 100ths of an inch.)

I didn't file the fork, I milled out the inside of the crown race with my Dremel tool. Very slightly and only a little bit at a time. Filing the fork is a recipe for disaster - it'll cost you hundreds to replace whereas if you botch the race, it's can be replaced for a couple of bucks. Go slowly, try to hand seat it as you remove material and you should be able to solve the problem.