Results 1 to 11 of 11
  1. #1
    mtbr member
    Reputation:
    Join Date
    Jul 2009
    Posts
    21

    Fork for a Soma 4one5

    Hi

    Picked up a Soma 4one5 frame for a steal and looking at fork options. Soma recommend a 440mm ac fork but I am thinking a Salsa CroMoto 425mm ac and a nice big 2.5 front tire would work just fine,

    yes/no?

  2. #2
    The need for singlespeed
    Reputation: zaskaranddriver's Avatar
    Join Date
    Oct 2009
    Posts
    973
    Congrats on the 4one5. That was a finalist in my search for a dedicated singlespeed 26er frame. The Soma was designed for an 80mm fork so the CroMoto with an A2C of 445 is probably best. Handling might be a bit quick with a 425. You'd need a pretty skinny tire out back to get the geometry back to stock. Do you want to be locked into that?

    That said, the Fox on my Two2one is a little short for an 80mm fork, and makes the handling very fast, which I happen to like (augments the 26erness). But anyone whos been riding 29ers a while would surely eat **** on my bike.

  3. #3
    mtbr member
    Reputation:
    Join Date
    Jul 2009
    Posts
    21
    Picked up a Salsa CroMoto in 445 so will give that a whirl ...

  4. #4
    The need for singlespeed
    Reputation: zaskaranddriver's Avatar
    Join Date
    Oct 2009
    Posts
    973
    Cool, let us know how it turns out.
    And I want pics of that 4one5!

  5. #5
    mtbr member
    Reputation: rzims's Avatar
    Join Date
    Sep 2005
    Posts
    1,024
    Love the 4one5! That was the first dedicated SS I built up and went with the longer 440mm fork
    Post up some pics

    Here's what mine looked like

  6. #6
    Cycle Psycho
    Reputation: Gritter's Avatar
    Join Date
    Dec 2010
    Posts
    477
    *oopspost*
    Last edited by Gritter; 02-18-2013 at 08:54 PM.

  7. #7
    mtbr member
    Reputation:
    Join Date
    Jul 2009
    Posts
    21
    Quote Originally Posted by Gritter View Post
    +1
    Well the 445mm Salsa fork ended up on another build (Charge Duster 69er) so I have ordered another one Going to go with the shorter 425mm cromoto and put a 29er wheel on the 4one5 as well

  8. #8
    Cycle Psycho
    Reputation: Gritter's Avatar
    Join Date
    Dec 2010
    Posts
    477
    *oopspost*
    Last edited by Gritter; 02-18-2013 at 08:54 PM.

  9. #9
    mtbr member
    Reputation:
    Join Date
    Jul 2009
    Posts
    21
    Quote Originally Posted by Gritter View Post
    Do you know where I can find the geometry chart for the Soma 4one5? Their site has bad links for all the geo pages.

    Is the 4one5 EXACTLY the same as the Soma Groove, except with Track Fork-End instead of vertical drops? (They have the geometry chart for the Groove, any possibility it's a perfect match?)

    425 is quite a drop from 445 on the CroMoto. I'm wondering why the Surly 1x1 is only 413mm, yet claims to be "susp corrected for 80mm", while the 445mm Cromoto is also susp corrected to 80mm. That's a huge difference. Is the 1x1 fork only "susp-corrected" on the 1x1 frame, because the 1x1 frame seems to have the exact same angles as the 4one5... All these numbers... Do they matter less than I'm worrying about?
    Here is a 2007 geometry chart

    Fork for a Soma 4one5-2007-brochure-000008.jpg

    Soma spec a 440mm fork for the 4one5 and Groove so to keep roughly the same geometry with a 29er front wheel I am going for a slightly shorter fork

  10. #10
    Cycle Psycho
    Reputation: Gritter's Avatar
    Join Date
    Dec 2010
    Posts
    477
    *oopspost*
    Last edited by Gritter; 02-18-2013 at 08:54 PM.

  11. #11
    mtbr member
    Reputation:
    Join Date
    Feb 2013
    Posts
    60
    Quote Originally Posted by Gritter View Post
    Is the 4one5 EXACTLY the same as the Soma Groove, except with Track Fork-End instead of vertical drops?
    Not the same:





    Quote Originally Posted by Gritter View Post
    425 is quite a drop from 445 on the CroMoto.
    Yes, some very different geometry figures from 425mm to 445mm:




Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •