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if i get a 10° stem... will it flatten out on my bike?

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if i get a 10° stem... will it flatten out on my bike?

Old 11-05-12, 07:29 AM
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vermilionx
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if i get a 10° stem... will it flatten out on my bike?

so i have 6° stem right now.

it's still pointing upward even when flipped. will a 10° stem fix it?

thanks.

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Old 11-05-12, 07:33 AM
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A 10° stem won't fix anything (unless you're replacing a broken stem), but it will be 4° closer to parallel with the deck.
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Old 11-05-12, 07:40 AM
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If you want a truly horizontal stem, then you need a -17 or 73 degree.
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Old 11-05-12, 07:49 AM
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Originally Posted by DaveSSS View Post
If you want a truly horizontal stem, then you need a -17 or 73 degree.
-17° will point downward.
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Old 11-05-12, 07:52 AM
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Originally Posted by MegaTom View Post
-17° will point downward.
Not with a 73 degree head tube which is pretty standard geomoetry.

Where all this desire to have a flat stem started is that conventional quill stems are -17, which were designed to be flat with 73 degree headtubes, and made the stem parallel to the ground.
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Old 11-05-12, 08:04 AM
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It's a geometry problem... A 73° head tube angle is 17° away from being vertical, so you would use a -17° stem to have the stem parallel to the ground...

However, IMHO, on a modern bike with threadless headset, a -17 stem looks like it's pointing downwards instead of being parallel; it's not but is an optical illusion. Look at pics of bikes set up with -17 stems and see for yourself.
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Old 11-05-12, 08:11 AM
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Originally Posted by merlinextraligh View Post
Not with a 73 degree head tube which is pretty standard geomoetry.
Math would seem to prove you correct. On my bike the -17 looks like its pointing down, though I suspect a level would say not so much.


--Edit--

Originally Posted by milkbaby View Post
However, IMHO, on a modern bike with threadless headset, a -17 stem looks like it's pointing downwards instead of being parallel; it's not but is an optical illusion. Look at pics of bikes set up with -17 stems and see for yourself.
Yeah, that's what I meant.
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Old 11-05-12, 08:42 AM
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Old 11-05-12, 08:45 AM
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It may have been public education, in which case the local property owners should ask for their money back.
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Old 11-05-12, 09:14 AM
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to the OP - do you have a goal in mind? Specifically is it appearance, height, or both? You have a huge spacer under the stem so if you want to lower your stem you can get a shorter version of whatever that thing is called and drop the stem, probably at least a centimeter.

+whatever to all the geometry answers.

Here's a -17 / 73 deg stem:

Last edited by carpediemracing; 11-05-12 at 09:17 AM. Reason: add pic
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Old 11-05-12, 09:21 AM
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OP, if I remember correctly, for a 100mm stem, every 2 degrees of change results in about 9mm change in bar height. The numbers are magnified if you go long, reduced if you go shorter.

So, if you go from -6 to -10, the stem will flatten some, though not be perfectly level, and your bar will drop about 18mm, assuming a 100mm stem.
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Old 11-05-12, 10:18 AM
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a -17° does look like it's pointing down.

im using a 110mm stem.

i think i can still go lower and be comfy but lowering isn't my goal, just wanted a parallel look. so, i'll prolly like aesthetically a -10°

thing is... this thing is 99$ (https://www.performancebike.com/webap...ssociationsCmd). i really have to be sure i'll like it since i don't wanna deal with the hassle of returning and waiting for refund.

thanks.
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Old 11-05-12, 10:47 AM
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Originally Posted by vermilionx View Post
a -17° does look like it's pointing down.

im using a 110mm stem.

i think i can still go lower and be comfy but lowering isn't my goal, just wanted a parallel look. so, i'll prolly like aesthetically a -10°

thing is... this thing is 99$ (https://www.performancebike.com/webap...ssociationsCmd). i really have to be sure i'll like it since i don't wanna deal with the hassle of returning and waiting for refund.

thanks.
If you are not sure of the fit or look, I suggest going on eBay and dropping $10 on a cheap stem that has the length and angle you want. If you like it, then you can go out and buy a nicer stem. If not, you toss it your spare parts bin - I find it nice to have a wide variety of stems.
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Old 11-05-12, 10:49 AM
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Old 11-05-12, 10:56 AM
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Originally Posted by topflightpro View Post
If you are not sure of the fit or look, I suggest going on eBay and dropping $10 on a cheap stem that has the length and angle you want. If you like it, then you can go out and buy a nicer stem. If not, you toss it your spare parts bin - I find it nice to have a wide variety of stems.
+1. I did exactly that with a specialized adjustable stem. It goes from -16 to +16 in 2 degree steps.
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Old 11-05-12, 11:11 AM
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Originally Posted by pdedes View Post
It's not how you feel it's how you look.
Channeling some 2ndgen wisdom there.
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Old 11-05-12, 11:29 AM
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Originally Posted by topflightpro View Post
If you are not sure of the fit or look, I suggest going on eBay and dropping $10 on a cheap stem that has the length and angle you want. If you like it, then you can go out and buy a nicer stem. If not, you toss it your spare parts bin - I find it nice to have a wide variety of stems.
Another idea is to hit up a bike shop (that you regularly patronize) for some take-off stems. You can walk away with a few stems, try them out, and see what the net effects are, pay whatever for the stem you want and return the rest.

A third idea is to hit up a friend that has a gazillion stems around who has done what topflight has suggested (and has a bin of various stems). I've helped some teammates with stems/fit and have dug into my cache of stems to help them fit their bike.
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Old 11-05-12, 01:02 PM
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Originally Posted by topflightpro View Post
OP, if I remember correctly, for a 100mm stem, every 2 degrees of change results in about 9mm change in bar height. The numbers are magnified if you go long, reduced if you go shorter.

So, if you go from -6 to -10, the stem will flatten some, though not be perfectly level, and your bar will drop about 18mm, assuming a 100mm stem.
Trigonometry. A 2° change on a 100mm stem results in a height change of 7mm.

OP said he has a 110mm stem. Changing from -6° to -10° will drop the bars almost 8mm. Changing from -6 to -17° will result in the bars dropping 21mm, nearly a full inch.
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Old 11-05-12, 01:07 PM
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Originally Posted by PatrickGSR94 View Post
Trigonometry. A 2° change on a 100mm stem results in a height change of 7mm.

OP said he has a 110mm stem. Changing from -6° to -10° will drop the bars almost 8mm. Changing from -6 to -17° will result in the bars dropping 21mm, nearly a full inch.
yeah, i wonder if i could still ride in the drops with a -17 stem.
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Old 11-05-12, 01:25 PM
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Originally Posted by vermilionx View Post
a -17° does look like it's pointing down
Sloping top tubes provide an optical illusion that makes flat stems look like they're pointing down.
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Old 11-05-12, 01:38 PM
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If you want your bars lower get rid of that giant cone. A -6 stem is perfectly acceptable from a cosmetic standpoint on a modern bike.

Here's a good tool for seeing what various stem/spacer configurations do for the position of your bars.

https://www.brightspoke.com/t/bike-stem-calculator.html
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Old 11-05-12, 01:54 PM
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Originally Posted by marqueemoon View Post
If you want your bars lower get rid of that giant cone. A -6 stem is perfectly acceptable from a cosmetic standpoint on a modern bike.

Here's a good tool for seeing what various stem/spacer configurations do for the position of your bars.

https://www.brightspoke.com/t/bike-stem-calculator.html
yeah, like i said, im not aiming to get lower. just wanted a flat stem position/look.

also, i don't think upgrading the headset would be worth it for my bike. stem at least, i can easily transfer if i get a new bike.

i tried looking to see if i can just can a flatter headset cover but no luck.
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Old 11-05-12, 02:03 PM
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Maybe you should get a Velo Orange tall stack and paint it black? Your bars don't look 31.8 though, so you'd have to shim or get new bar





I like the Habanero cycles stem chart.


Last edited by LesterOfPuppets; 11-05-12 at 02:07 PM.
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Old 11-05-12, 02:10 PM
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Originally Posted by LesterOfPuppets View Post
Maybe you should get a Velo Orange tall stack and paint it black? Your bars don't look 31.8 though, so you'd have to shim or get new bar
im pretty sure my bars are 31.8. isn't that the most common?

anyway, i made the mistake of buying a 0 deg stem before and it was a 31.8 and it fitted my current bars when i used it for a short time.
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Old 11-05-12, 02:11 PM
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Originally Posted by vermilionx View Post
yeah, like i said, im not aiming to get lower. just wanted a flat stem position/look.

also, i don't think upgrading the headset would be worth it for my bike. stem at least, i can easily transfer if i get a new bike.

i tried looking to see if i can just can a flatter headset cover but no luck.
If you're happy with your current position don't change it. End of thread.
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