Steerer Tube Cap Sizing Help
03-23-20, 03:40 PM
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Steerer Tube Cap Sizing Help
I have a question about the headset cap on my bike. I have a Cane Creek Headset and ordered a used Cane Creek cap for it, just for the uniformity of it (1 inch steerer). When I got it, to my surprise, it was actually 1" in diameter and when installed, only covered the actual steerer tube. This left a crevice around and between the steerer tube and the stem where water would sit should it get wet during a wash or a rain storm. My old cap was a 1.3 inch diameter and covered the entire steerer tube and the top of the stem. If water hit it, it wouldn't fall between the steerer and the stem.
Where did I go wrong? The way this is set up, how would you tighten the headset? The cap wouldn't pull against anything but the top of the steerer tube.
Thanks in advance.
Where did I go wrong? The way this is set up, how would you tighten the headset? The cap wouldn't pull against anything but the top of the steerer tube.
Thanks in advance.
Last edited by UKFan4Sure; 03-23-20 at 03:49 PM.
03-23-20, 04:13 PM
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Yup, you need the larger cap. You could just use the Profile cap in the photo. I have a 1" CC Headset on my 1" steerer as well and the larger 1 1/8" cap was supplied with it to fit my 1 1/8' stem with a shim installed. Give CC a call if you want the cap with CC writing on it.
Last edited by Crankycrank; 03-23-20 at 04:23 PM.
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03-23-20, 04:17 PM
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Take the cap off so that we can see if you have a shim on your stem so that a possible 1 1/8 stem can fit a 1" steer tube. You need a cap that fits the stem, not the steer tube
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03-23-20, 04:24 PM
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Ahhh.... Maybe that's the problem as there is a shim over the carbon steerer. I thought that shim was standard with a carbon steerers to provide some sort of equalization of the clamping forces. I see now you are correct. Maybe the Profile Designs cap is actually for the stem, which is 1-1/8, needing that shim to make up the difference? I feel like an idiot...
03-23-20, 04:27 PM
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Ahhh.... Maybe that's the problem as there is a shim over the carbon steerer. I thought that shim was standard with a carbon steerers to provide some sort of equalization of the clamping forces. I see now you are correct. Maybe the Profile Designs cap is actually for the stem, which is 1-1/8, needing that shim to make up the difference? I feel like an idiot...
03-23-20, 04:30 PM
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Ahhh.... Maybe that's the problem as there is a shim over the carbon steerer. I thought that shim was standard with a carbon steerers to provide some sort of equalization of the clamping forces. I see now you are correct. Maybe the Profile Designs cap is actually for the stem, which is 1-1/8, needing that shim to make up the difference? I feel like an idiot...
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03-23-20, 04:59 PM
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1" carbon steer tubes are almost extinct. I only thought of this because I have a touring bike with a steel 1" threadless fork. 1" carbon threadless forks are basically unicorns
03-23-20, 06:07 PM
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No, bought nothing else, so shipping is the issue. I paid $14 for the cap. It's a nice one, though. It's one inch. If you should need a 1" unicorn. It also came with the star-fangled washer and bolt.
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