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Thread: Stems ?

  1. #1
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    Stems ?

    Maybe this is a dumb question. But are all (MTB) stems standard or equal width/thickness. I am referring to the part that clamps onto the steering tube. My bike has the stock stem and 30mm of spacers underneath. As an example, If I replace my current stem with xyz stem will it fit ? Or will I need to replace one of my 5mm spacer with a 2mm or more? Or will my steerer tube be too long, and have to add spacers?

  2. #2
    Hardtail Steel Forever
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    Most modern bikes have a 1 1/8in upper steerer tubes, but in the past 1in or 1.5in were not entirely uncommon, they're not common from anything around 2001 and on though. So, assuming you don't have anything out of the ordinary, you need to measure the stack height of your current stem, and see if the new one you are looking at is the same. If the new one is taller, it should be fine as is if it's not too much higher, or you can remove a spacer. If it's much lower, you either need to add spacers or cut your steerer some.
    WTB: Med Bontrager Ti Lite, PM Me...

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    Are you talking about necks?
    Scarlett Johansson loves my hummus.

  4. #4
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    ^^^ yes. The stack height of the stem where it clamps to the steerer can differ between brands and models. You can usually accommodate different stack heights by changing out spacers as needed, sometimes changing one of the spacers below, or adding a 5mm spacer above.
    Do the math.

  5. #5
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    Most stems have around a 40mm stack height. Some manufacturers will list the the stack on their website.

  6. #6
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    If you're changing stems and wondering if you'll need additional spacers...yes or no. It could go either way, or it could match up exactly. I recently switched stems and had to add 5mm spacer due to the difference in the stack height. As RS VR6 said, check out the manufacturers specs and compare them to your current stem.

  7. #7
    Out spokin'
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    Quote Originally Posted by juan_speeder View Post
    Are you talking about necks?
    I miss those days...

    Hey, on another note I'm considering promoting a fat bike drag race. Whaddya think?
    =sParty
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  8. #8
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    sParty, you miss goose neck stems? I don't, threadless is much better and the headset adjustment is also better IMO, YEMV. I equate that with someone saying v-brakes are better than disc.

    As others have mentioned, stack height may be different. I would also agree that the average seems to be 40, but I saw an all mountain stem the other day that was 30. Don't know if that might be better for a carbon steerer plug, but it seemed short to me.
    I don't know why,... it's just MUSS easier to pedal than the other ones.

  9. #9
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    Quote Originally Posted by dbhammercycle View Post
    sParty, you miss goose neck stems? I don't, threadless is much better and the headset adjustment is also better IMO, YEMV. I equate that with someone saying v-brakes are better than disc.

    As others have mentioned, stack height may be different. I would also agree that the average seems to be 40, but I saw an all mountain stem the other day that was 30. Don't know if that might be better for a carbon steerer plug, but it seemed short to me.
    Naw, I was just jokin' around. The Ahead system employed on modern bikes is far superior to the ancient wedge-in-steerer system of old.

    I was jokin' about the fat bike drag race, too. I don't even have a fat bike. But I do have a mud bike.
    =sParty
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  10. #10
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    Quote Originally Posted by Sparticus View Post
    Naw, I was just jokin' around. =sParty
    I shoulda known...
    I don't know why,... it's just MUSS easier to pedal than the other ones.

  11. #11
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    ok....thanks guys. so it is referred to as "stack height".

  12. #12
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    I replaced a road bike stem. I had to add spacers to make up the difference between the two stems.

  13. #13
    Sneaker man
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    Quote Originally Posted by Sparticus View Post
    I miss those days...

    Hey, on another note I'm considering promoting a fat bike drag race. Whaddya think?
    =sParty
    Weren't "those days" just last week! (althought the drag race was a while ago...)...either way happy times.
    All the gear and no idea.

  14. #14
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    Quote Originally Posted by mik_git View Post
    Weren't "those days" just last week! (althought the drag race was a while ago...)...either way happy times.

    =s
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  15. #15
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    Quote Originally Posted by mik_git View Post
    Weren't "those days" just last week! (althought the drag race was a while ago...)...either way happy times.
    Sure seems like it, don't it? But actually, that was seven years ago. My how time flies.
    Quote Originally Posted by Oh My Sack! View Post
    Remember, there's always quilting and knitting if pedalling becomes too tough.

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