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I have an old caad x frame which i got powedercoated a while back and never built up, and a box of parts. I'd planned to build it into a cheapish winter bike. The issue is the only fork i have is a brand new selcof (from a planet x tempest) which his 1.5 taper steerer.thwbold fork was 1.25.
Can I fit an external bottom cup that'll let me use the selcof fork. The geometry won't really be affected, as the selcof fork is slightly shorter than the original caad x one.
Ta
I've done it on a couple of Trek Marlin MTB's that my kids had. Think it depends on the headtube....The Treks take a semi-intergrated headset in a 44m headtube I think...
It has an internal headset and the bearing seat looks to be about 5mm up from the head tube. I can't see a way to fit a bottom bracket cup in there
It will depend on the headtube. Internal cup 1 1/8" can be fitted with an external cup 1.5" bearing on the bottom. If you Google about headset compatibility, you should be able to identify what you have and what you would need to convert.
Google throws up nothing. Chat gpt says not possible. I'm struggling to see how it's possible either tbh as I can't see how I can press an external cup into thr frame, unless the lower cup presses into the frame less than 5 mm
It will depend on the headtube. Internal cup 1 1/8" can be fitted with an external cup 1.5" bearing on the bottom. If you Google about headset compatibility, you should be able to identify what you have and what you would need to convert.
The issue is the caad x doesn't use an external cup. The fork itself fits in the frame without a Bearing, but obviously there isn't room to also fit a bearing in there
The fork itself fits in the frame without a Bearing
?? really! I cant believe the fork race just sits on the metal of the headtube? are you sre there isnt an internal cup and bearing in there- pics would help
easiest way might be to measure it
you can fit a 1.5 lower into a 44mm headtube like in this diagram
It has an internal headset and the bearing seat looks to be about 5mm up from the head tube. I can't see a way to fit a bottom bracket cup in there
If it is an integrated headset where the bearing fits into the frame (IS) without pressed in cups of any kind (ZS or EC) then you may as well buy a different fork because if anyone does make something suitable it will not be be cheap. It's possible, see 9.8 SlackR headsets for the theory, but I suspect you are not going to find what you want.
Edit: actually is it even possible? If you poke the steerer up the head tube does it even fit in place without a bearing?
if it's like this:
then it looks like it's an internal, integrated headset and you're not going to find anything to fit unfortunately. The Slack-r type slackeriser is for integrated tapered head tubes
Easiest option might be to look for. 1-1/8” straight steerer fork and a suitable step down race.
But do measure the head tube (or look up details on the model year). There have been “integrated” headtubes of all sorts on road bikes for a while now, and muddling a 42mm an 44mm ID would be a frustrating mistake for the sake of a bit of measurement…
Yep it's definitely integrated. I've dug put the old fork and, whilst it weighs more than the moon, a little spray paint will hopefully mean it doesn't look completely awful
Unless someone can Recommend a suitable carbon fork replacment (thats cheap but not from some no name chinese brand)
Yep it's definitely integrated. I've dug put the old fork and, whilst it weighs more than the moon, a little spray paint will hopefully mean it doesn't look completely awful
Unless someone can Recommend a suitable carbon fork replacment (thats cheap but not from some no name chinese brand)
If it looks like the one posted above, contact cannondale, there was a recall and they replaced them with full carbon forks for free. Although this might be why it's missing, at the time 1.125 disk forks were (and still are) as rare as hens teeth, wouldn't surprise me if someone got the replacement fork and put it in something else instead. I think Hylyx do one, but with a 12mm axle.
There is no way of getting a tapered fork in that headtube.
?? really! I cant believe the fork race just sits on the metal of the headtube? are you sre there isnt an internal cup and bearing in there- pics would help
Most modern-ish road bikes have integrated headsets, there is no cup, the bearing just drops straight into the machined headtube.
I think its a 1.25 at the bottom bearing not 1.1/8. So any standard road disk fork technically fits. Ie the fork from my giant defy fits just fine, the issue is that it's completely wrong for the geometry of the bike
Gives a few crown adapters to 1 1/8th steerers. You just need to know the diameter of the head tube/bearing to use any 1 1/8th fork of the right length.
Those adapters are shims for fitting smaller forks to larger headtubes...I have the opposite issue, the fork is too wide to fit a bearing in the headtube
Internal diameter of head tube is 47mm. Base of fork is 40mm. So I'd need a bearing that only took up 3.5mm of space either side. Which I assume doesn't exist
I'd need a bearing that only took up 3.5mm of space either side.
You'd need an external bottom cup to replace the internal one. Whether you can buy one off-the-shelf will depend on the exact details of your headtube, but you're probably out of luck on that. A standard 44 mm headtube with an internal bearing can take a 1.5" external cup.
standard 44 mm headtube with an internal bearing can take a 1.5" external cup.
But mine has an integrated headset. So you couldn't push in an External cup in unless the lip is less than about 5 mm