Easton EC90 road stem on a mountain bike???- Mtbr.com
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  1. #1
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    Easton EC90 road stem on a mountain bike???

    I have a brand new EC90 road stem from a road build I was doing but now have no need for. Anyone ever run one of these on a mountain bike to save a little weight? I have a Thomson X4 right now and was just curious. Not trying to make the bike super light but trying to lighten it up some.

    Any thoughts?

  2. #2
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    31.8mm handlebar or 25.8mm bar clamp? Keep in mind that MTB bars are 25.4mm diameter so you'd need shims.

  3. #3
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    Um, not all mtb handlebars are 25.4. Not sure where you are getting that but a lot are 31.8 including the Easton EC70 flat bar I have.

    Clamp size is not a factor at all nor could it be...

  4. #4
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    Quote Originally Posted by Duff Man
    Clamp size is not a factor at all nor could it be...
    If you had 25.4 bars and a 26 road stem it would be. Hence the question to check you did in fact have a 31.8 road stem.
    www.yourtrails.net/weights/ - Kick ass weights listing
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  5. #5
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    I think he meant that the smaller sized MTB bars are 25.4mm which is a different size than the smaller sized road bars. Both road and MTB have handlebars that are 31.8mm. Since you are talking about a road stem, he wanted to make sure that it is a 31.8mm clamp, because if it is the smaller size clamp you will need shims to use it with a 25.4mm MTB handlebar. Since you currently have a Thompson X4 I am going to assume that you are using a 31.8mm bar and that your Easton EC90 is for a 31.8mm road bar, in which case you are good to go as far as compatibility is concerned. As far as weight savings, it looks like you will probably save something to the tune of 50g or so max. The X4 at 110mm is listed at 172g whereas the EC90 at 120mm is listed at 137g. I don't know how durable the EC90 will be in an off-road setting...if it is strictly for XC use then maybe. I run a Syntace stem that weighs 105g, so...yeah...

  6. #6
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    yep, what they said...

  7. #7
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    Considering the Easton EC90 stem is only available in 31.8 clamp size I didnt think it would be a question on if I had the correct size clamp on the stem.

    Thanks on your insight on the weight differences though, much appreciated. I will check out the Syntace stems

  8. #8
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    Quote Originally Posted by Duff Man
    Considering the Easton EC90 stem is only available in 31.8 clamp size I didnt think it would be a question on if I had the correct size clamp on the stem.

    Thanks on your insight on the weight differences though, much appreciated. I will check out the Syntace stems
    Sorry, I haven't really researched the EC90 so I didn't know it was only available in one clamp size. Anyway, I didn't mention the Syntace to say "you can get a lighter stem than the Easton" so much as to say "you should probably be good to go with the Easton since I run an even lighter stem"

  9. #9
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    Quote Originally Posted by AggieXCRacer
    Sorry, I haven't really researched the EC90 so I didn't know it was only available in one clamp size. Anyway, I didn't mention the Syntace to say "you can get a lighter stem than the Easton" so much as to say "you should probably be good to go with the Easton since I run an even lighter stem"

    Yeah, I am thinking about it. I like the -10 degree rise on it as well not to mention that it looks pretty killer.

  10. #10
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    Easton is ok...

    the EC90 are ok.
    all 31.8 are the same diameter so it will fit perfectly.

    i just had Easton parts on my scale last week:
    the stems come with 6 steel bolts so expect 8g savings with titanium bolts.
    100: 138g
    110: 143g
    120: 147g

    Easton EC 90 SL handlebar (31,8): 125g
    Easton Monkeylite SL: 149g
    Attached Images Attached Images

  11. #11
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    nino, amount of your photos amaze me all the time

    Greetz
    vi3dr0
    Aluminium Carbon / Damping Composite

  12. #12
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    Quote Originally Posted by vi3dr0
    nino, amount of your photos amaze me all the time

    Greetz
    vi3dr0
    thanks.
    i just take pics of everything i can...

  13. #13
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    Just out of curiosity, do you have any weights of the EC90 stem?

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