Fathom 29 vs 27.5 geo- Mtbr.com
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  1. #1
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    Fathom 29 vs 27.5 geo

    So the 29er version of the fathom lists 69 head angle with a 100 fork, and the 27.5 lists a 67 head angle with a 120 fork.

    So are they completely different frames? I'd assume it would be cost prohibitive to make 2 completely different geo frames.

  2. #2
    WillWorkForTrail
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    Yes, different frames. Several reasons. First, 20mm of travel is going to be 1 degree change of angle tops. Second, because the 29er rolls over stuff easier, less slack is needed, but since gyroscopic effect will make it feel like it steers slower, the steeper angle will offset that. Giant is going to try to make the best riding bikes they can at a price point, but they are the largest bike manufacturer in the world, the cost of a separate frame for the two wheel sizes is nothing to them, while losing sales because they make a bike that rides like crap is potentially problematic, and there's no reason to do it.

  3. #3
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    Gotcha just seems weird cuz trek Roscoe, santa Cruz chameleon, salsa timberjack and many others share a frame between 29 and 27.5+ but that's good to know.

  4. #4
    WillWorkForTrail
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    Quote Originally Posted by mrbadwrench View Post
    Gotcha just seems weird cuz trek Roscoe, santa Cruz chameleon, salsa timberjack and many others share a frame between 29 and 27.5+ but that's good to know.
    Yeah, no worries. See, the key there is 27+ - so this is just 27.5. The frame they use for that probably won't hold a 29er.

  5. #5
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    I'm looking at buying a Specialized fuse. i.e a modern geometry Trail 29er.

    Its a shame that Giant doesn't really do a comparable bike. They have demonstrated that they do understand modern geometry with the Trance 29er and Reign 29er.

    How old are the current model Fathom 29er and 27.5 frames? does anyone know when they were introduced?

  6. #6
    WillWorkForTrail
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    Quote Originally Posted by dave_rh View Post
    I'm looking at buying a Specialized fuse. i.e a modern geometry Trail 29er.

    Its a shame that Giant doesn't really do a comparable bike. They have demonstrated that they do understand modern geometry with the Trance 29er and Reign 29er.

    How old are the current model Fathom 29er and 27.5 frames? does anyone know when they were introduced?
    Two years ago I think. I'd say the Fathom is close to getting a refresh, but I don't know that I'd hold my breath for it. It might come this year, but I'd reckon it's more likely to be a 2022 refresh.

  7. #7
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    Iím actually about to get a 27.5 fathom 2 for a camping/loaner/backup bike. Iím getting it for well under retail and itís got a decent feature set for the price.

    The geo is actually fairly close to my Fuel EX as far as HT and ST go so I hope it feels similar. I honestly donít think I need anything more slack than 67-68*.


    Sent from my iPhone using Tapatalk

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