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  1. #1
    mtbr member
    Join Date
    Sep 2015

    picking fork offset and travel change

    I think this is the correct forum. If not, please move.

    I'm trying to figure out which SID ultimate fork offset to use. The SID is available in either 51mm or 42mm offset. I plan to run it on a Scott Spark frame clone. The frame is specc'ed at 68 headtube angle, 100mm travel (506 a to c), with a 51mm offset fork.

    I plan to run a 120mm fork which should slacken the headtube angle by about a degree to 67. Do I order the 51mm or do I switch to the 42mm? I think both slackening the headtube and shortening offset would increase trail. I don't want a super twitchy bike but I also don't want super floppy front wheel.

    I live in Minnesota and where I ride is relatively smooth and flat. I'm definitely more of a XC go fast guy than big drops and pounding through chunky downhills. I'm coming off a 2016 stumpjumper with 140/135 that has too much pedal bob and squish for what i need. My head is spinning trying to figure this out.

  2. #2
    mtbr member
    Reputation: minimusprime's Avatar
    Join Date
    May 2009
    51 offset, for your terrain I would leave the frame/fork at 100mm.

  3. #3
    mtbr member
    Join Date
    Sep 2015
    Quote Originally Posted by minimusprime View Post
    51 offset, for your terrain I would leave the frame/fork at 100mm.
    So 51mm offset for both 100mm or 120mm?

    I can't get past 100mm being too little in my head and being a huge drop from the 140 I'm riding now. I was shooting for something like the Trek Top Fuel or Epic Evo with little more trail bike than pure XC racer bike. I won a SID Ultimate Carbon and was going to lengthen it to 120mm but SRAM informed me they cannot be lengthend because the carbon uppers are too short. So I was going to drop down to the regular SID Ultimate so I could get the 120mm.

  4. #4
    mtbr member
    Reputation: Lone Rager's Avatar
    Join Date
    Dec 2013
    More offset means less trail which means faster handling favoring climbing and tight maneuvering over stability at speed and descending. The diff is pretty small. Personally, I'd go with 51 for either or other travels.
    Do the math.

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