Bicycle Mechanics - Questions about 1" internal headset

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abarth
03-09-10, 09:13 AM
I have an older C'dale frame with a 1" headtube. I am going to put a threadless carbon fork in it. I was searching for a threadless headset and came across 1" internal headset. My questions are, will it work with my older C'dale frame? Doesn't internal headset change the effective geometry of the frame, so the top tube kind of slope down forward? The bearings in a internal headset are smaller I assumed. Will the internal headset bearings last as long as transitional headset? Thanks

joejack951
03-09-10, 09:23 AM
Link to the headset in question? As a general rule, you cannot change what type of headset your frame was designed for. So if you have external cups now, you need to stick with external cups.
DaveSSS
03-09-10, 09:28 AM
Internal headset do not affect the frame geometry. You probably have the 38.5mm slip-in bearings. That's the only internal size listed at Park tool, for a 1" steering tube.

http://www.parktool.com/repair/readhowto.asp?id=68

TallRider
03-09-10, 09:59 AM
while I don't have experience working wiht internal headsets, I'm with joejack on this. I don't see how you're going to get your frame retrofitted for internal headset. and even if you could send it to Cannondale for such retrofitting, it wouldn't be worth the cost anyway.

do you have reason for wanting an internal headset other than "running across it"?
get a standard 1" threadless headset (likely ISO for your Cannondale: 30.2mm where the cups fit into the headtube, and 26.4mm diameter for the crown race.
abarth
03-09-10, 11:24 AM
This is what I was looking at.

http://stores.channeladvisor.com/velopages/items/item.aspx?itemid=2205423
HillRider
03-09-10, 11:32 AM
Joejack and TR are correct, either your frame was originally designed for an internal headset or it was designed for the older press-in cup type. You must use the same type it came with.


Yes, in theory, the headtube could be replaced but there is no reason to do so.
davidad
03-09-10, 11:39 AM
You don't want an integrated headset anyhow. It's more marketing hype. Get a conventional 1" aheadset.
abarth
03-09-10, 01:12 PM
Got it, thanks.
TallRider
03-09-10, 01:34 PM
good luck with your rebuild
operator
03-09-10, 01:36 PM
Joejack and TR are correct, either your frame was originally designed for an internal headset or it was designed for the older press-in cup type. You must use the same type it came with.


Yes, in theory, the headtube could be replaced but there is no reason to do so.

Or it was designed for an integrated headset.
operator
03-09-10, 01:37 PM
Internal headset do not affect the frame geometry. You probably have the 38.5mm slip-in bearings. That's the only internal size listed at Park tool, for a 1" steering tube.

http://www.parktool.com/repair/readhowto.asp?id=68


And to the OP: How about taking a picture of the headtube or being a little more specific in your description.
TallRider
03-09-10, 07:04 PM
And to the OP: How about taking a picture of the headtube or being a little more specific in your description.
I figured "older C'dale frame with a 1" headtube" and the fact that it was threaded was enough to know that it wasn't designed for an integrated headset.

Although I agree that generally, in these situations, pictures can help.