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Thread: Dropper length

  1. #1
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    Dropper length

    Hello

    I would like to ask you about Dropper seatpost for my bike, because I am confused and lost. I just want to buy Giant Contact Switch dropper for my Rock Machine bike

    The diameter is fine, the inner guide through the frame as well. It's in a size M frame. I'm small, so I don't need an extra high saddle. However, I do not know which variant to choose.

    My current seatpost measures a whole of about 350 mm (from the attachment of the saddle to the end). When I set the stroke for driving uphill, the protruding part measures approx. 213 mm. When I put it all the way down, it travels about 240mm (you can see about 110mm)

    So it is possible to use a variant with a length of 340mm and a stroke of 100mm, which in the end will be similar to size of my current seatpost, or is it better to choose a smaller variant, which is about 295mm and 75 stroke?

    Thank you

  2. #2
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    The ideal dropper post for most riders is fully inserted and extends to your desired maximum saddle height. In reality, you have to compromise due to a combination of frame insertion limits, post travel restraints, and your body measurements. Generally, though, the closer you can get to the ideal situation, the better.

    Your numbers don't all make sense to me, as you say it travels 240mm? I think (and will assume) you have a 350mm seatpost with 100mm of travel. It also appears you still have about 110mm of post sticking out of the seat tube when compressed. If so, that's a lot and indicates you could use a longer travel seatpost if your seat tube will allow, OR... your frame may simply be too small for you.

    AM.

  3. #3
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    Giant provides information to assist you in selecting the correct length dropper.

    https://www.giant-bicycles.com/us/gear/sizingpage/176

  4. #4
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    Quote Originally Posted by Woko_O View Post
    Hello

    I would like to ask you about Dropper seatpost for my bike, because I am confused and lost. I just want to buy Giant Contact Switch dropper for my Rock Machine bike

    The diameter is fine, the inner guide through the frame as well. It's in a size M frame. I'm small, so I don't need an extra high saddle. However, I do not know which variant to choose.

    My current seatpost measures a whole of about 350 mm (from the attachment of the saddle to the end). When I set the stroke for driving uphill, the protruding part measures approx. 213 mm. When I put it all the way down, it travels about 240mm (you can see about 110mm)

    So it is possible to use a variant with a length of 340mm and a stroke of 100mm, which in the end will be similar to size of my current seatpost, or is it better to choose a smaller variant, which is about 295mm and 75 stroke?

    Thank you
    Check out our dropper length selector.

    https://can.oneupcomponents.com/page...st-selector-v2

    From the dimensions you sent you could fit a 150mm OneUp Post. As always nobody can fit a longer post is your bike than OneUp.

    Jon

  5. #5
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    Attacking Mid: Right now I do not have dropper seatpost. Just standard one which I want to change for dropper. Whole seatpost measures 350. When I fully push it down to my frame that means I push 240mm inside to frame and 110mm stay above (I hit the bend inside of frame). When I set my saddle to my desired postion for saddle height, ideal for uphill etc, there is 213mm above a frame of seatpost tube up to the saddle attachment.

    My only question is, if I change the standard seatpost for dropper post which measures 340mm and has 100mm stroke, it will be all right to find my ideal position as it is close by dimensions to my current hard seatpost or I should choose shorter or longer variation. Because you know. I just can not buy and return stuff just like that for trying..

    My frame is not small from me, I think. I am 170cm tall (or short)

    BrianU: thank you. I have tried it calculate but it did not give me a totally wise answer I mean maybe it says I can use from 100mm up to 150.. But I am not sure How that is going to work for me..

  6. #6
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    Looking at Giant's fit guide, it looks like you should have over 2" (55mm) to spare with the 100mm travel post. I say go for it...

  7. #7
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    I am not affiliated with OneUp and don't even own one of their posts, but if I were you, I'd take a serious look at what was posted above by OneUp. I think you'd be happier with their post than the Giant post.

    AM.

  8. #8
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    I agree but this is a matter of finances I am willing to spend for dropper seatpost. Because this bike is kind of a low end hardtail and maybe next year I would like to upgrade for full suspension bike. So I do not want to invest extra more money.

  9. #9
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    It can be maddening to figure out the dimensions for maxing out stroke. I created an Excel spreadsheet to help me sort it out. One thing to consider is that if you have a perfect fitting post length, changing your saddle might increase the rail to top distance and you'll need to drop your post a bit. If it's already slammed, you're out of luck.

  10. #10
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    I will see. I have ordered 340mm and 100mm stroke Giant and hopefully everything will fit as I measured it yesterday on my bike (I hope my math and work with meter was good)

  11. #11
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    Does anyone know what cable housing is used with this dropper seat post (diameter)? I want to buy one before it will arrive from shop (it looks like there is only a cable and lever). Thanks

  12. #12
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    regular 4mm shifter housing and a shifter cable should work. be sure to put a ferrule on each end of the housing.

  13. #13
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    Thank you. I will get those from local shop. I think it comes with cable only, but probably something like 2mm cable (according to video on youtube) - I hope it will come tomorrow and I'll be able to take or measure that cable before the weekend starts

  14. #14
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    Dropper posts usually come with cable and hose.

    Sent from my LIO-N29 using Tapatalk

  15. #15
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    So.. It came today. There is 1.2mm cable and no housing. So I had to buy one and it is pretty hard to cut it without proper cutter. So I gave up and tomorrow I will go to my workshop and hard tool will come to its word. I will use angle grinder. It should be quicker and smoother..

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