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  1. #1
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    new soma b-side build (but wrong fork travel, oops)

    i built up a soma b side but i used a 130mm travel white bros fork i got off ebay, I guess you are supposed to use 80mm forks. is it going to be a problem?

    new soma b-side build (but wrong fork travel, oops)-img_0114%25u0025255b1%25255d.jpg

  2. #2
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    Why would it be a problem? How does it ride? Fine, then no problem.
    2013 Rocky Mountain Altitude 730
    2013 Pipedream Sirius R853 - 650b Belt Drive

  3. #3
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    Looks good. Doesnt look too raked out.

  4. #4
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    Longer fork puts more force on the headtube. It doesn't look too bad, but an email to Soma would be the way to go.
    That kind of failure could be painful.
    -Carlos

    Flux

  5. #5
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    Quote Originally Posted by los36 View Post
    Longer fork puts more force on the headtube. It doesn't look too bad, but an email to Soma would be the way to go.
    That kind of failure could be painful.
    Maybe painful on the wallet if it fails.

    It's not plastic, so unless Soma is using epoxy to hold their tubes together, the headtube is not going to separate from the frame.

    Also, the longer travel will actually dampen huge hits or drops more than short travel. I think the OP will be alright. Nothing to worry about.
    2013 Rocky Mountain Altitude 730
    2013 Pipedream Sirius R853 - 650b Belt Drive

  6. #6
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    My B-Side broke clean in two, right in the middle of the downtube. I ride hard, but the frame had experienced no notable crashes. I was running a 100mm fork. They use thin tubing, I would be wary...

  7. #7
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    Thanks guys, im new to mtb (road rider) so im not riding too hard right now, it honestly feels fine to me, yeah i just dont want the frame to break and get hurt. Maybe in a few months when i get a little ballsier ill look into a new fork

  8. #8
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    I also recommend for you to reach out to Soma so you can get first hand communication whether its safe.

    Soma told me yesterday that any 100 mm travel 650b fork or a 26er fork with 120mm travel that fits 650b wheels will work on the B Side. I then verified with X-fusion that their Velvet fork converted to 650b @ 100 mm has an A2C of 489mm unsagged.

    A 130 mm fork is way more than 489 A2C. The bike will handle differently compared to 100mm but its always good to make sure that you will be safe on it. A quick email only takes a minute to type and send. They return emails pretty quickly.

  9. #9
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    People make a way bigger deal out of it then necessary. If the ride feels fine to you, then it will be alright. If you threw a 150mm on there, then I'd be hesitant. Ride it and be happy.

  10. #10
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    email from soma:

    Hi Alex,

    Looks good!

    I wouldn't worry about it much. If it rides ok, the there shouldn't be an issue. Bascially what happens when you run a longer fork is the head tube angle is reduced, so it changes the steering a little. Many agressive riders prefer a slacker head angle for descending so it might actually ride better for you.

    -Evan

    Soma Fabrications

  11. #11
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    Now go rip it and give us a ride report.

    I am going to use a 100mm 29er fork with an A2C of 500 mm unsagged when my frame arrives.

  12. #12
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    It looks awesome as you have it. Ride the crap out of it!

  13. #13
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    I run 140mm forks on my Soma B with 650b wheels and a 100 29er fork with 29er wheels. Both are close in AC height and both a huge improvement over OE spec forks.

  14. #14
    Wrench
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    This will change your HT angle

    ... By about a degree and a half.

    Which makes for a slower steering bike that's a little less stable when climbing steep terrain.
    Quote Originally Posted by Alex Steiner View Post
    i built up a soma b side but i used a 130mm travel white bros fork i got off ebay, I guess you are supposed to use 80mm forks. is it going to be a problem?

    Click image for larger version. 

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  15. #15
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    I know, old thread. I am wondering what size that B-side is? Looks like a medium...

    I am 6'1 and torn on the sizing. 18.5" is really close to too small and the 20.5" seems like it might be a smidge on the big side for me. Wish there was a 19" with a 24" tt. I ride a large Chromag Stylus currently, but it's just a bit too small. Planning on running a lowered Pike 454 dual air with the frame.

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