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  1. #1
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    So I give you a Thomson X4 stem................

    What size would you want? (I do have a reason for asking)

    Model Number Stem Description Size Retail Price
    SM-E130 1-1/8″ x 0° x 50 mm x 31.8 mm 167 g $99.95
    SM-E164 1-1/8″ x 0° x 60 mm x 31.8 mm 177 g $99.95
    SM-E131 1-1/8″ x 0° x 70 mm x 31.8 mm 141 g $99.95
    SM-E157 1-1/8″ x 0° x 80 mm x 31.8 mm 149 g $99.95
    SM-E132 1-1/8″ x 0° x 90 mm x 31.8 mm 154 g $99.95
    SM-E133 1-1/8″ x 0° x 100 mm x 31.8 mm 160 g $99.95
    SM-E134 1-1/8″ x 0° x 110 mm x 31.8 mm 165 g $99.95
    SM-E135 1-1/8″ x 0° x 120 mm x 31.8 mm 172 g $99.95
    SM-E136 1-1/8″ x 0° x 130 mm x 31.8 mm 178 g $99.95
    SM-E138 1-1/8″ x 10° x 90 mm x 31.8 mm 154 g $99.95
    SM-E139 1-1/8″ x 10° x 100 mm x 31.8 mm 160 g $99.95
    SM-E140 1-1/8″ x 10° x 110 mm x 31.8 mm 165 g $99.95
    SM-E141 1-1/8″ x 10° x 120 mm x 31.8 mm 172 g $99.95
    SM-E142 1-1/8″ x 10° x 130 mm x 31.8 mm 178 g $99.95
    Lead by my Lefty............... right down the trail, no brakes.

  2. #2
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    60mm...why?

  3. #3
    Cleavage Of The Tetons
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    Agreed, 60mm. Should I PM you my address now?
    "We LOVE cows! They make trails for us.....

    And then we eat them."

  4. #4
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    Quote Originally Posted by fr0sty View Post
    60mm...why?
    I'm getting a free one and just want to know what would be a popular size to get as I cannot use it and I would sell it. (I have a Lefty)
    Lead by my Lefty............... right down the trail, no brakes.

  5. #5
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    Yeah I'd anticipate 60mm to be the most popular.

  6. #6
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    90 x 10 degrees

  7. #7
    Cleavage Of The Tetons
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    Oh. Well then, I'll offer you 1/2 wholesale for it.
    "We LOVE cows! They make trails for us.....

    And then we eat them."

  8. #8
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    Quote Originally Posted by rideit View Post
    Oh. Well then, I'll offer you 1/2 wholesale for it.
    I will have that and a number of other things to sell as I have just too many parts around I don't use anymore.
    Lead by my Lefty............... right down the trail, no brakes.

  9. #9
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    I'd buy an 80mm for the right price since I'm curious if I'd like it more than the 70mm thats on my Banshee currently.

    70-100 will be easiest to offload.

  10. #10
    Big Gulps, Alright!
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    60mm. For the right price it'll sell like hotcakes.
    Axle Standards Explained

    Founder at North Atlantic Dirt, riding & writing about trails in the northeast.

  11. #11
    Bandit 29 FTW!!!
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    I run fidy's on all my bikes...FYI I've never paid more than $75 for Thomson X4 anything. I run their stems and seat posts on all my bikes.
    Let's make like a Bike and get the Huck outta here...

  12. #12
    Anytime. Anywhere.
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    50 or 60 are standard now. Longer than that is very old fashioned like 50mm travel forks.
    I got some bad ideas in my head.

  13. #13
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    Quote Originally Posted by Travis Bickle View Post
    50 or 60 are standard now. Longer than that is very old fashioned like 50mm travel forks.
    THIS! But don't tell that to the XC crowd who continue to think that bike "fitment" is the first and foremost deciding factor for stem length (heaven forbid - I got several negative rep posts for suggesting the TRUTH!), LOL!

    Have FUN!

    G MAN

    PS - I'd take an SM-E130!
    Last edited by Gman086; 09-17-2013 at 10:46 AM.
    "There's two shuttles, one to the top and one to the hospital" I LOVE this place!!!

  14. #14
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    Quote Originally Posted by Gman086 View Post
    THIS! But don't tell that to the XC crowd who continue to think that bike "fitment" is the first and foremost deciding factor for stem length (heaven forbid - I got several negative rep posts for suggesting the TRUTH!), LOL!

    Have FUN!

    G MAN

    I don't get it. So everyone needs to disregard fit and slap on a 50 mm stem?

  15. #15
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    Stems should be used for handling effects not fit on mountain bikes. Over the years mine got shorter until now I use 50-55mm for everything including mellow xc rides. Elbows bend for a reason.
    I got some bad ideas in my head.

  16. #16
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    Some people are just absurd and don't think before they talk/type. Yes, 50mm and 60mm have become very popular. Yet, there are still those who are aware of the benefits of 50mm and 60mm but still prefer to go longer do to fitment advantages. I personally switch between a 50mm easton haven and 50mm renthal duo stem and I am currently waiting on a 70mm thomson X4 I got for "Free" for ordering a dropper post from jenson

  17. #17
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    Quote Originally Posted by shredjekyll View Post
    Some people are just absurd and don't think before they talk/type. Yes, 50mm and 60mm have become very popular. Yet, there are still those who are aware of the benefits of 50mm and 60mm but still prefer to go longer do to fitment advantages. I personally switch between a 50mm easton haven and 50mm renthal duo stem and I am currently waiting on a 70mm thomson X4 I got for "Free" for ordering a dropper post from jenson
    Right. And the "handling effects" of a shorter stem might not be the effects everyone wants or needs.

  18. #18
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    Quote Originally Posted by smilinsteve View Post
    I don't get it. So everyone needs to disregard fit and slap on a 50 mm stem?
    Me either. 50mm stem with narrow bars sounds horrible but seems like most people dont care about any other element of bike fit except the stem length. Nor any elements of frame geometry except head angle and chainstay length.

  19. #19
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    it all depends on the bike's geo.

    i think with slacker angles and more aggressive riding/riders/terrain shorter stems make more sense for handling when used with today's wider bars. It makes sense to get your bike fit with frame size and use stem size to address handling. if you're gonna use the stem to "fit" then fit it while your standing off the saddle cuz that's when it's in play the most. when you hit tech or at speed.

    ...so to the op...50mm @ 0deg, please and thnx.

  20. #20
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    Quote Originally Posted by 53119 View Post
    it all depends on the bike's geo.

    i think with slacker angles and more aggressive riding/riders/terrain shorter stems make more sense for handling when used with today's wider bars. It makes sense to get your bike fit with frame size and use stem size to address handling. if you're gonna use the stem to "fit" then fit it while your standing off the saddle cuz that's when it's in play the most. when you hit tech or at speed.

    ...so to the op...50mm @ 0deg, please and thnx.
    Couldn't have said it better myself 53119! I think too many readers sit while riding or have dated bikes ;-)

    Thanks,

    G
    "There's two shuttles, one to the top and one to the hospital" I LOVE this place!!!

  21. #21
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    One point I'd like to make is that there will always be those individuals who could ride either small/medium, medium/large, large/xl, and decide on the smaller frame for maneuverability but need to stretch the cockpit a little bit. I am 5'11 on an 18" new generation slayer and I have very long arms. Currently I have 770 bars with a 50mm stem and I can tell that a slight bump up to 70mm will do me well in terms of weight distribution.

  22. #22
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    Quote Originally Posted by shredjekyll View Post
    One point I'd like to make is that there will always be those individuals who could ride either small/medium, medium/large, large/xl, and decide on the smaller frame for maneuverability but need to stretch the cockpit a little bit. I am 5'11 on an 18" new generation slayer and I have very long arms. Currently I have 770 bars with a 50mm stem and I can tell that a slight bump up to 70mm will do me well in terms of weight distribution.
    Excellent point. In general, I could have the fit I want with a medium and a 75mm stem, or a large with a 50mm stem. If I pick the large, I lose some standover clearance, I get a heavier frame, I get a longer wheelbase, and I get a higher head tube which could effect getting the optimium bar height. A lot of disadvantages by going with a large just to run a shorter stem.
    So, is a 75 mm stem too long? Hell no. This stem length think is WAY overemphasized. The disadvantages of a large frame (for me) are much worse than having a longer stem, which I don't find to be a disadvantage at all. It just changes the weight distribution a little bit.

  23. #23
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    Quote Originally Posted by smilinsteve View Post
    Excellent point. In general, I could have the fit I want with a medium and a 75mm stem, or a large with a 50mm stem. If I pick the large, I lose some standover clearance, I get a heavier frame, I get a longer wheelbase, and I get a higher head tube which could effect getting the optimium bar height. A lot of disadvantages by going with a large just to run a shorter stem.
    So, is a 75 mm stem too long? Hell no. This stem length think is WAY overemphasized. The disadvantages of a large frame (for me) are much worse than having a longer stem, which I don't find to be a disadvantage at all. It just changes the weight distribution a little bit.
    "You must spread some Reputation around before giving it to smilinsteve again." Good points all around.

    Dont get sucked into one detail when your cockpit and steering geometry is affected by much more than stem length.

  24. #24
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    Quote Originally Posted by GTscoob View Post
    "You must spread some Reputation around before giving it to smilinsteve again."
    Its the thought that counts!

  25. #25
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    Here's some fuel for the fire: Mondraker Introduces Forward Geometry: Are You Ready for a 10 mm Stem?

    Have FUN!

    G MAN
    "There's two shuttles, one to the top and one to the hospital" I LOVE this place!!!

  26. #26
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    Quote Originally Posted by Gman086 View Post
    Here's some fuel for the fire: Mondraker Introduces Forward Geometry: Are You Ready for a 10 mm Stem?

    Have FUN!

    G MAN
    And Kona is specing 40 mm stems on their new line. Its definitely the industry trend, so it must be the way to go!

  27. #27
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    The Mondraker concept has been out for a while and just pushes this to the extreme. I'd like to ride one and see how it feels. Basically all you're doing is lengthening the top tube in order to run the shortest stem possible. Long wheelbases are great for stability but not for agility. Faster steering input from a short stem can only do so much when you're trying to whip a cadillac around a switchback.

  28. #28
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    Quote Originally Posted by GTscoob View Post
    The Mondraker concept has been out for a while and just pushes this to the extreme. I'd like to ride one and see how it feels. Basically all you're doing is lengthening the top tube in order to run the shortest stem possible. Long wheelbases are great for stability but not for agility. Faster steering input from a short stem can only do so much when you're trying to whip a cadillac around a switchback.
    The faster steering from a shorter stem is just marketing hype. I calculated it in another thread recently. IIRC, for a 10 degree turn, the end of the bar moves only 2 mm less using a 50 mm stem vs 100 mm. Insignificant.

  29. #29
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    Quote Originally Posted by GTscoob View Post
    The Mondraker concept has been out for a while and just pushes this to the extreme. I'd like to ride one and see how it feels. Basically all you're doing is lengthening the top tube in order to run the shortest stem possible. Long wheelbases are great for stability but not for agility. Faster steering input from a short stem can only do so much when you're trying to whip a cadillac around a switchback.
    It's not really the extreme yet. Next year they will be going back to 100 mm stems, but turned backwards!!

  30. #30
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    people run what their skillset is comfortable with. with an organic engine in constant flux it's all personal anyway. a rider's technique or lack of is more responsible for good/bad fit from my observations.

    there's alot of difference in handling and weight distribution between a 50mm and a 100mm stem to call it "insignificant". you don't "turn" the bar for a 10degree turn. you lean the bike/yourself/or both AFTER you've calculated your entrance speed with your line choice. whether it's steep, loose, off-camber, bluegroove, braking bumps or whatever. if you're coming in hot or not you're not turning that bar. you should be pumping into the turn anyway. you're weighting it to initiate the turn so 50mm is not insignificant. respectfully disagree.

  31. #31
    Bro Mountainbiker
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    I got a 70mm x4 for sale for "whatcha got in your pocket"

    Atlanta GA
    Raised in a Chicken-Coop by Chickens

  32. #32
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    Sometimes calculations get in the way of "feel.". The noticeable handling effects of 50 v. 100 far exceed your calculations.

  33. #33
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    Quote Originally Posted by 53119 View Post
    people run what their skillset is comfortable with. with an organic engine in constant flux it's all personal anyway. a rider's technique or lack of is more responsible for good/bad fit from my observations.

    there's alot of difference in handling and weight distribution between a 50mm and a 100mm stem to call it "insignificant". you don't "turn" the bar for a 10degree turn. you lean the bike/yourself/or both AFTER you've calculated your entrance speed with your line choice. whether it's steep, loose, off-camber, bluegroove, braking bumps or whatever. if you're coming in hot or not you're not turning that bar. you should be pumping into the turn anyway. you're weighting it to initiate the turn so 50mm is not insignificant. respectfully disagree.
    My post had nothing to do about weight distribution or any other handling characteristic other than the bar movement claim made in the Mondraker article: Specifically:

    Furthermore, despite the increase in wheelbase, the bike will supposedly have livelier steering than its “classic” 70 mm counterpart, because the 10 mm stem will require less handlebar movement to get the same front wheel angle.
    Of course 50 and 100 mm stems will feel differently in a lot of ways, but this claim, as I said, is just marketing.

  34. #34
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    One guy's experience: I switched from 110mm stem and narrow bars to 50mm and wide bars and it feels nice to me. Also helps compensate for my lack of technique - it saved me from one otb experience and I've been flying over the bars a little less since I made the switch lol

  35. #35
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    on the stem length handling/fitment? argument earlier......you don't see motos running 70mm offset stems....

    BTW, where's the 60mm X4 from Thomson......

  36. #36
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    Seems ridiculous for anyone to say one length or another is the "best" for anyone other then themselves. Just too many variables, riding styles, and good old personal preference.

  37. #37
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    Quote Originally Posted by Gripo View Post
    on the stem length handling/fitment? argument earlier......you don't see motos running 70mm offset stems....

    BTW, where's the 60mm X4 from Thomson......
    Curious to see it as well, if it's anything like the stubby 50mm X4 or does it look like all the 70-110mm X4 stems.
    konahonzo

  38. #38
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    So I give you a Thomson X4 stem................

    Quote Originally Posted by eurospek View Post
    Curious to see it as well, if it's anything like the stubby 50mm X4 or does it look like all the 70-110mm X4 stems.
    This is like 3yrs ago (pre FB/Twitter)I emailed them asking about a 60mm X4 and a less chunky version of the 50mm version....which they'd said was the way forward, can only hope I guess.

    I beieve late Jan 2014 for the 60mm X4?

  39. #39
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    The difference in handling between different stem lengths is so huge. I don't understand how someone can say there's little difference between 50mm and 100mm.
    I can feel an enormous difference between 50mm and 70mm. I'd find 100mm unrideable on a mountain bike, unless your trails are very flat or you're ok with the constant feeling of going OTB, or constantly actually going OTB.
    I'm sure there's some reason in certain conditions to use a 60 or 70mm stem, though I can't find one.
    But the benefits of a 50 or 40mm (thumbs up Kona) stem (combined with wider bars) are huge. Incredible stability, confidence and the ability to get over virtually anything.

  40. #40
    Anytime. Anywhere.
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    The other day I cleaned a very steep, rocky, and roots climb with my 55mm stem. I used to ride 90-100 and didn't climb better than I do now. It's all technique not stem length for climbing. So much safer and controllable going down.
    I got some bad ideas in my head.

  41. #41
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    1-1/8th" x 8° or 10° x 40mm x 31.8mm, maybe?
    I drive more when the streets need repairs! -'95 ZJ

  42. #42
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    Quote Originally Posted by Gripo View Post
    This is like 3yrs ago (pre FB/Twitter)I emailed them asking about a 60mm X4 and a less chunky version of the 50mm version....which they'd said was the way forward, can only hope I guess.

    I beieve late Jan 2014 for the 60mm X4?
    I originally requested this stem as my promotional freebee. It was in production and had a Dec/Jan time frame.
    Lead by my Lefty............... right down the trail, no brakes.

  43. #43
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    Quote Originally Posted by pdxmark View Post
    1-1/8th" x 8° or 10° x 40mm x 31.8mm, maybe?
    Things change.
    My road rig needed a new stem because the FSA one on there was a piece of crap as the face plate was clamping bars weird. The plate was made just a tad too small a radius.

    So, I ended up getting an X2 road stem.

    In the end, I guess I just teased everyone
    Lead by my Lefty............... right down the trail, no brakes.

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