One bolt to secure “quill” style threadless stem
04-05-23, 11:15 AM
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One bolt to secure “quill” style threadless stem
I like the classy, chunky look of this stem: https://www.ebay.com/itm/225508819878?mkcid=16&mkevt=1&mkrid=711-127632-2357-0&ssspo=HpvRd4LmQAu&sssrc=2349624&ssuid=-dXDd8HATLm&var=&widget_ver=artemis&media=COPY
Not sure if I should worry if the one securing bolt is sufficient or not. Any opinions on this to share?
Not sure if I should worry if the one securing bolt is sufficient or not. Any opinions on this to share?
04-05-23, 11:39 AM
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I have a similar FSA Metropolis stem on my son's bike:
At first I ran it without a top cap, and it loosened after a while. I put a top cap on it and it's held up fine since.
At first I ran it without a top cap, and it loosened after a while. I put a top cap on it and it's held up fine since.
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04-05-23, 11:44 AM
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Many of these are not for use with carbon steerers.
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04-06-23, 10:55 AM
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Good point. The clamp bolt is the primary source of tension that keeps the headset in adjustment. If it's clamping below the internal expansion nut it will likely crush the steerer before it holds enough tension to keep the headset from loosening. An extra long internal expansion nut might solve this.
Look at this point in consideration of minimum insertion. If the steerer tube doesn't penetrate at least part way into the level of the gooseneck, I'd expect the stem to work loose or even damage the steerer, since there's just one bolt holding and it is considerably below the line of torque. And if you're using a carbon steerer without an extended nut, you're going to crush the steerer.
And if you'd be using this stem to get some more rise from the steerer, without consideration for minimum insertion, it will give you nothing but trouble.
Look at this point in consideration of minimum insertion. If the steerer tube doesn't penetrate at least part way into the level of the gooseneck, I'd expect the stem to work loose or even damage the steerer, since there's just one bolt holding and it is considerably below the line of torque. And if you're using a carbon steerer without an extended nut, you're going to crush the steerer.
And if you'd be using this stem to get some more rise from the steerer, without consideration for minimum insertion, it will give you nothing but trouble.
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04-06-23, 11:21 AM
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Good point. The clamp bolt is the primary source of tension that keeps the headset in adjustment. If it's clamping below the internal expansion nut it will likely crush the steerer before it holds enough tension to keep the headset from loosening. An extra long internal expansion nut might solve this.
Look at this point in consideration of minimum insertion. If the steerer tube doesn't penetrate at least part way into the level of the gooseneck, I'd expect the stem to work loose or even damage the steerer, since there's just one bolt holding and it is considerably below the line of torque. And if you're using a carbon steerer without an extended nut, you're going to crush the steerer.
And if you'd be using this stem to get some more rise from the steerer, without consideration for minimum insertion, it will give you nothing but trouble.
Look at this point in consideration of minimum insertion. If the steerer tube doesn't penetrate at least part way into the level of the gooseneck, I'd expect the stem to work loose or even damage the steerer, since there's just one bolt holding and it is considerably below the line of torque. And if you're using a carbon steerer without an extended nut, you're going to crush the steerer.
And if you'd be using this stem to get some more rise from the steerer, without consideration for minimum insertion, it will give you nothing but trouble.
04-06-23, 03:16 PM
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...in addition to the minimalist approach to bolt tensioning, the pricing of 100 bucks would probably make me think twice about buying one.
The entire design seems like a great step backward, in threadless stem design, for function and durability.
...in addition to the minimalist approach to bolt tensioning, the pricing of 100 bucks would probably make me think twice about buying one.
The entire design seems like a great step backward, in threadless stem design, for function and durability.
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