Can Stem Extend Slightly Higher Than Steerer?
07-26-20, 02:39 PM
#1
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Thread Starter
Can Stem Extend Slightly Higher Than Steerer?
Bought a new stem today for the rise but when I put it on, it extends a little under 1/2" from the top of the steerer. The stem cover and screw still had more than enough threads to tighten and everything feels tight and good but I was just wondering if this could be a problem over time? I do have a spacer beneath I could remove if I had to but I really like the height it's at now so I'd prefer to leave it. Thanks!
07-26-20, 02:57 PM
#2
Banned
Unstated , I assume you mean a threadless steerer.. a steel steerer as long as the top bolt of the 2 on the back has something to grasp,
Stem, no higher than the center line of that bolt hole, you should be OK..
Carbon steerer, the whole stem , no higher than flush with the top of the steerer, add a 5 mm spacer above for the headset adjustment function .
Stem, no higher than the center line of that bolt hole, you should be OK..
Carbon steerer, the whole stem , no higher than flush with the top of the steerer, add a 5 mm spacer above for the headset adjustment function .
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07-26-20, 03:37 PM
#3
Non omnino gravis
If you have a carbon fork, the mfr. will tell you the absolute limits. My Cervelo wants the top of the stem 2-4mm above the top of the steerer, zero spacers above stem, and a max of 50mm below stem (bearing cap and spacers combined.)
Steel fork? Do whatever you want really, as long as the stem bolts aren't grabbing air.
Steel fork? Do whatever you want really, as long as the stem bolts aren't grabbing air.
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07-26-20, 08:37 PM
#4
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Thread Starter
Unstated , I assume you mean a threadless steerer.. a steel steerer as long as the top bolt of the 2 on the back has something to grasp,
Stem, no higher than the center line of that bolt hole, you should be OK..
Carbon steerer, the whole stem , no higher than flush with the top of the steerer, add a 5 mm spacer above for the headset adjustment function .
Stem, no higher than the center line of that bolt hole, you should be OK..
Carbon steerer, the whole stem , no higher than flush with the top of the steerer, add a 5 mm spacer above for the headset adjustment function .
07-26-20, 08:39 PM
#5
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Thread Starter
If you have a carbon fork, the mfr. will tell you the absolute limits. My Cervelo wants the top of the stem 2-4mm above the top of the steerer, zero spacers above stem, and a max of 50mm below stem (bearing cap and spacers combined.)
Steel fork? Do whatever you want really, as long as the stem bolts aren't grabbing air.
Steel fork? Do whatever you want really, as long as the stem bolts aren't grabbing air.
07-26-20, 09:01 PM
#6
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So the top stem bolt isn't clamping against anything. Not something I'd do.
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07-27-20, 07:18 AM
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I play fast and loose with drivetrain specs (low consequence), I mix and match brakes and levers across series (redundant systems), and experiment with wheel sizes outside of a frame sets design parameters, but I don’t mess with the handlebar/steerer connection. The worst crashes I have seen and heard of are when the bars are in the rider’s hands, but don’t have control of the front wheel.
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07-27-20, 08:04 AM
#9
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If you need the bars that high, then the bike does not fit you. Switch to an endurance geometry frame with a taller head tube. Please a side view photo of the entire bike as you have it now?
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07-27-20, 10:29 AM
#11
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How about a picture so people aren't guessing?
07-27-20, 11:34 AM
#12
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Is there a spacer or two below the stem you can take out? I usually try to get no more than 5 mm of stem height above the steerer -- 1/2" (12 mm) sounds too high.
07-27-20, 01:07 PM
#13
Banned
and still leave a gap for your top cap to pull down into ,..
07-27-20, 01:09 PM
#14
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There is a reason that you don’t see one-bolt stems on the market.
07-27-20, 04:07 PM
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1) I agree with the others re the risk of using the stem you just got , but
2) What was the situation with the previous stem; was it's coverage the the steerer enough less so that both bolts were supported ? If so, just measure it and get a new stem with the same measurement ( and the rise angle you need) rather than try some hack that may kill you...and rather than getting a new bike
PS :a year so so ago got a really nice 2003 K2 MOD 4.0 road bike that had an original one bolt alloy stem...it was the first thing to go
2) What was the situation with the previous stem; was it's coverage the the steerer enough less so that both bolts were supported ? If so, just measure it and get a new stem with the same measurement ( and the rise angle you need) rather than try some hack that may kill you...and rather than getting a new bike
PS :a year so so ago got a really nice 2003 K2 MOD 4.0 road bike that had an original one bolt alloy stem...it was the first thing to go
07-28-20, 05:26 PM
#18
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Thread Starter
07-28-20, 05:28 PM
#19
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Thread Starter
1) I agree with the others re the risk of using the stem you just got , but
2) What was the situation with the previous stem; was it's coverage the the steerer enough less so that both bolts were supported ? If so, just measure it and get a new stem with the same measurement ( and the rise angle you need) rather than try some hack that may kill you...and rather than getting a new bike
PS :a year so so ago got a really nice 2003 K2 MOD 4.0 road bike that had an original one bolt alloy stem...it was the first thing to go
2) What was the situation with the previous stem; was it's coverage the the steerer enough less so that both bolts were supported ? If so, just measure it and get a new stem with the same measurement ( and the rise angle you need) rather than try some hack that may kill you...and rather than getting a new bike
PS :a year so so ago got a really nice 2003 K2 MOD 4.0 road bike that had an original one bolt alloy stem...it was the first thing to go
07-28-20, 05:29 PM
#20
Senior Member
Thread Starter
Yeah if I take out the spacer below it, it'll bring the stem even with the steerer top so I think I'll do that and order a higher angle stem to see if that makes it better
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07-28-20, 05:35 PM
#23
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Thread Starter
I think the bike fits fine...Got a size L and I'm 6'. Just rather be biking pretty upright due to back issues. Also posted a picture!
07-28-20, 05:55 PM
#24
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Actually I just took out the spacer below and although they look pretty even, I think the steerer is ever so slightly higher and wont allow me to get pressure down when tightening cap screw and thus leaving my fork a bit loose so looks like I need to switch out some spacers ...
07-28-20, 05:56 PM
#25
Banned
I bought a BBB BHP 21 stem raiser, & took out the star nut, there are others that clamp on the outside that use the star nut as it sits ,,
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