2016 Rocky Mountain Thunderbolt sizing help- Mtbr.com
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  1. #1
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    2016 Rocky Mountain Thunderbolt sizing help

    I am looking to purchase a 2016 rocky Mountain Thunderbolt.
    Need help with the sizing. I am 5'10' 30' inseam.
    Medium or large frame?
    Most of my mountain bikes have been mediums (17/18 inch).
    There is no rocky mountain shop near me to test fit/ride.
    I am leaning toward a large but not sure.
    Bike will be used for trail riding/singletrack.
    What size Thunderbolt do you ride.
    Any suggestions are appreciated.
    Thanks

  2. #2
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    At 5'-10" you'd be squarely in a medium fit unless you have unusually long arms or torso, or short legs. I'm 6'-1" with orangutan arms and and ride a Large.
    I'm a member of NSMBA and IMBA Canada

  3. #3
    row
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    Go large, I'm 5'-10.5" with long legs and ride a large with 50mm stem . Tried a medium and felt too squashed.

  4. #4
    swm
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    5'10" 31" inseam
    Comfortable on a medium 2017 730 MSL, never sized a large.
    Last edited by swm; 04-26-2018 at 06:54 PM. Reason: typo

  5. #5
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    I'm the same size as you and I rode a medium, BUT I felt the reach on the bike was too short, especially in the slack setting. If I upsized to a large, I couldn't fit longer than a 100mm dropper on there, which would not be enough for me.

    I think a medium would work for you if you're the kind of person who likes a slack seat tube, as that effectively lengthens the top tube. I like a steep seat tube, so I slammed my saddle almost all the way forward on the rails. But this made the top tube feel too short, running a 50mm stem. I ultimately got another bike that fit me better

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