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Singlespeed & Fixed Gear "I still feel that variable gears are only for people over forty-five. Isn't it better to triumph by the strength of your muscles than by the artifice of a derailer? We are getting soft...As for me, give me a fixed gear!"-- Henri Desgrange (31 January 1865 - 16 August 1940)

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Old 01-12-06, 05:17 PM   #1
46x17
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Stem Angle Match problem

I have a 120mm stem at 0 degree with riser bars. The rise is 45 mm.
What angle stem would I need to get to achieve the same bar height with flat bars?
The stem can also be a bit longer up to 130mm.

Thanks!
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Old 01-12-06, 05:21 PM   #2
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First, this is basic trigonometry. You need the pytagorean theorum and the sine/cosine/tangent formulas. Wikipedia will help you.

Second, and not to snark, why not just use flat bars?
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Old 01-12-06, 05:23 PM   #3
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Quote:
Originally Posted by genericbikedude

Second, and not to snark, why not just use flat bars?
Because the current height is very comfy. So to keep comfy height I will need a different stem.

Thanks for the tip.
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Old 01-12-06, 05:27 PM   #4
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oh, I get it. i thought you were trying to go from flats to a riser/deep drop combo. that would be stupid.
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Old 01-12-06, 05:30 PM   #5
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this was posted before somewhere, but couldn't find the exact post.

does this help?
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Old 01-12-06, 05:39 PM   #6
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I figured it out. I need approx. an additional 20 deg rise.
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Old 01-12-06, 05:40 PM   #7
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Thanks for all your help!
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Old 01-12-06, 05:42 PM   #8
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Quote:
Originally Posted by 46x17
I figured it out. I need approx. an additional 20 deg rise.
with a 130mm extension??? that's what i'm getting after studying that chart.
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Old 01-12-06, 05:55 PM   #9
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Yes. The chart rules btw!
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Old 01-12-06, 06:03 PM   #10
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not to pick nits, but the "stack height" of your new stem is going to affect rise as well.
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Old 01-12-06, 06:11 PM   #11
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What is stack height?

You talking about spacer or the stem steertube clamp part?

Regardless, if i ever go flat I will use the same model stem (with different angle) and no spacers anyway. I just put on some flat bars and flipped the current stem. To simulate a potential new setup. Made over the bar skids suck. So risers are staying until I get over the poser tricks.
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Old 01-12-06, 06:12 PM   #12
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stem steertube clamp bit. some are longer than others.
shouldn't matter thaaaaaat much though.
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Old 01-12-06, 06:15 PM   #13
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Quote:
Originally Posted by baxtefer
stem steertube clamp bit. some are longer than others.
That is true.
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Old 01-12-06, 06:26 PM   #14
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Is this new flat bar for your bike?
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Old 01-12-06, 06:32 PM   #15
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Quill stems rock.
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Old 01-12-06, 06:40 PM   #16
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Quill stems rock.
no they dont.
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Old 01-12-06, 07:10 PM   #17
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Quote:
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Is this new flat bar for your bike?
I desired one for about an hour today for my bike.

Then I managed to try one out (friends bar) and decided that my risers are staying.
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Old 01-12-06, 07:10 PM   #18
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"Quill stems rock"

I'm starting to feel that way too.. I dig the look of forged quill stems more than the big blobby funky threadless ones, for sure, especially with 1-1/8" steerers..

Obviously the connection is not as solid with quills (nor as stiff, probably), but there are certainly some functional and aesthetic pluses.
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Old 01-12-06, 07:17 PM   #19
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salsa makes/made some very nice threadless stems. They are tigged steel and don't have that ugly fatness that other stems have. I also really like the look of the Thomson Elite stems although those are very beefy.
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Old 01-12-06, 07:55 PM   #20
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I love the look of quill stems, but apparently threadless is really the way to go from a mechanical standpoint.
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Old 01-12-06, 08:27 PM   #21
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You back in the city clayton? I'm pissed, it was so nice out and I wanted to ride today but I'm all sick...
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Old 01-13-06, 08:29 AM   #22
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Quote:
Originally Posted by 46x17
my risers are staying.
On-One Mary bar right? How you liking them so far? I have been thinking about them myself for a change. Any pics?
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Old 01-13-06, 08:56 AM   #23
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**** threadless.
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Old 01-13-06, 09:03 AM   #24
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**** threadless.
**** your dumbass 34mm flat wrench
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Old 01-13-06, 09:11 AM   #25
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Quote:
Originally Posted by 46x17
salsa makes/made some very nice threadless stems. They are tigged steel and don't have that ugly fatness that other stems have. I also really like the look of the Thomson Elite stems although those are very beefy.
Salsa does indeed. Super stiff, sleek to match a thinner tube look.



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