Bicycle Mechanics - changing my headset on my 2003 Giant ocr2 ...somebody, please!
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I have the bike listed above. This frame has a 1" threaded headset and fork combo but the headset is integrated ( but in addition to the bearing cartridge there are internal cups that rise just above the head tube. I was told by some guy on another forum that the internal headset used actually reduces the internal diameter of the head tube down to 1" and this particular frame can use a zero stack headset at 1 1/8" ( he suggested Orbit). I called Giant directly and the 2 guys I spoke with had no clue of the internal diameter or what my options would be of the head tube. Somebody let me know if I can replace this headset with a 1 1/8" headset and fork I think the head tube diameter is large enough and Giant had 1 1/8" headsets before and after. Also, if it makes a difference the size of my frame is 53cm (small compact).
04-28-07, 11:11 PM
I sell these bikes, but I don't know the answer. If you can measure the dia of the headtube without the cup in place then you have a number you can use to check for compatability for a 1 1/8th internal headset.
04-28-07, 11:12 PM
There is no way its not 1 1/8. I am having a little trouble deciphering what your question is but here is a link that may be helpful.
04-28-07, 11:55 PM
I looked at the four TCR frames(Sorry no OCRs) I have hanging up. Without the cups, the inner dia. of the head tube is 41mm(approx.) on the two that take 1" steerers. Of the two with 1 1/8th steerers, one has cups and the ID is 44mm(approx), the other is machined for bearings with no cups and is also 44mm.
Then I looked thru the Quality catologue. I might have missed it but I did not see any 41mm(Turns out it is 41.4mm)OD headsets that fit a 1 1/8th steerer.
Rev. Chuck and/or fixedmonkey...
so are you telling me this head tube will only fit a 1 1/8" steerer without the cups, or does the zero stack headset accommodate this situation. The deal is... I have this perfect carbon deda and stem and a new ouzo pro forkthat I really want to use. That's why I want to change.
O.K. here's the deal... I took out the cups and found that the bearings were loosely (without cage) pressed directly into the cups with a cone on top and a "C" clip holding the cone to the cup. Now... the internal diameter of the HT is 41.4mm and the outside diameter of the face of the head tube (where the cup actually makes contact is 47mm - I've been doing more searching and found that with these specs. a low profile system should work with 1 1/8" fork. Am I missing something here? Here is one of the sources I used:
04-30-07, 08:03 AM
I just got off the phone with the BikeMine guys. They said that the listing in the link you sent me was a typo and was actually for a 1" steerer. Thanks for your help, though...I guess my quest continues...
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