Need help for the size of the YT Jeffsy 27 CF 2018-
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  1. #1
    mtbr member
    Join Date
    Apr 2011

    Need help for the size of the YT Jeffsy 27 CF 2018

    I知 on the edge to bay a YT Jeffsy 27 CF 2018. But I知 not sure for the size as I知 just in the middle of size M and L.
    I知 going to use it in some smaller bikeparks in Sweden and Harzen (not the heavy stuff).
    Iエm normally riding XC (have done it for the past 10 years) so Iエm new in the trail/all-mountain game and therefor seek some advice for the size of the frame

    I知 176 cm height and have normally a saddle high of 73,5 mm with a 175 mm crankset (my inseam length is app. 82 cm).

    The geometry of the YT Jeffsy is the following
    Reach: M 435mm L 455mm
    Top tube effective: M - 602mm L - 625mm
    Wheelbase: M - 1.173mm L 1.204mm
    Seattube C-T: M 450mm L 480mm
    Headtube: M 110mm L 125mm


  2. #2
    Slower But Faster
    Reputation: BrentD's Avatar
    Join Date
    Jul 2006
    I was in the same dilemma (and am just very slightly taller than you) when looking at this model Jeffsy. The long seat tube length on the large was the issue getting the saddle height right for me a full seat post extension. In the end I went in a different direction and landed on a Trek Remedy.

  3. #3
    mtbr member
    Join Date
    Jun 2012
    also was looking at a jeffsy at 180cm with a 81cm inseam and couldn't see the bike fitting. you might get away on a medium if you feel ok with that reach, or are ok with swapping out the dropper for a 125mm one.

  4. #4
    BrassBalled DropbarNinja
    Reputation: mrpercussive's Avatar
    Join Date
    Apr 2006
    Think you might have the geo numbers from the 2017?

    I'm 5'8 on a good day with short legs and long arms and had some time on a medium 2018 Jeffsy CF. Thought the bike fit pretty well actually though the 150mm dropper that came with it was definitely way too long and I would've rather had a 120mm or even a 100mm dropper. Note that I also run the saddle further back as well and am not really a fan of these steep seatpost angles as it makes it trickier to load the rear axe on technical climbs

    Here's a video on my thoughts of the 2018 Jeffsy CF

  5. #5
    mtbr member
    Join Date
    Jan 2012
    Here's an article on the changes to the cf 27 and 29 Jeffsy for 2019. Shorter seat tube is one with added reach.
    OP would likely be a medium.

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