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  1. #1
    mtbr member
    Join Date
    Jul 2008

    46mm Vs 51mm offset forks on the same frame

    Has anyone tried a 46mm offset fork and a 51mm offset fork on the same frame.

    I have a frame to build up, theoretically designed for my Fox34 29 with 51mm offset. There aren't really any concessions to the frame geo on the back of the fork offset.

    I was planning to replace the Fox with a Pike. I can get a 51mm offset Pike, but they are lagging behind the 46mm in terms of availability.

    Anyone experience both offsets e.g. swopped from a Revelation 140mm to a Fox34 on the same frame that can give me some feedback (Subjective I know) on how much the steering is slowed/speeded up by the different offset?

    The shorter offset obviously decreases the wheelbase slightly (6mm) but results in more trail thus slowing steering response slightly(and adding a theoretical amount of stability)

    I have only ever used the 34 on my frame.

    Basically trying to decide if I need to wait for the 51mm Pike or not.

    Aka chainline...

  2. #2
    I Tried Them ALL... SuperModerator
    Reputation: Cayenne_Pepa's Avatar
    Join Date
    Dec 2007
    The 51mm offset fork will have shorter trail, for a stable ride without the twitchy feeling found on steeper head tubes. The only maker that optimizes a 51mm fork offset through "G2" geometry, is Gary Fisher/Trek. Otherwise, go with whatever is available and not worry too much about it....seriously.
    "This is a male-dominated forum... there will be lots of Testosterone sword-shaming here" ~ Kenfucius

  3. #3
    mtbr member
    Reputation: Colin+M's Avatar
    Join Date
    Feb 2009
    The Ibis Ripley was designed around a 51mm offset as well.

  4. #4
    mtbr member
    Join Date
    Jul 2005
    What is the axle to crown on both forks? The Fox34 has a greater offset standard to account for it's higher axle to crown height. If you look at the numbers for an F29 - 32 120mm vs a an F34 29er spaced to 120, you will see what i mean. I have used both G2 and 46 mm offset forks on the same bike and the handling was affected a bit, but nothing you couldn't get used to.

  5. #5
    mtbr member
    Join Date
    Mar 2015
    46mm to 51mm it a huge difference or not just that noticable?

  6. #6
    mtbr member
    Reputation: socal_jack's Avatar
    Join Date
    Dec 2008
    I have had a Pike 140mm on my ROS9 in both offsets. The 46mm(borrowed off my RIP9) was a bit more "twitchy" at low speed but once rolling, there was not a huge difference but noticeable I think. I ended up getting the 51mm as the final fork after trying the 46mm, so no back-to-back rides which would have been more helpful for a comparison like you're looking for, just going by memory. Super happy with the final result, handles awesome, makes me think about dumping my RIP9(2010) frame.

  7. #7
    Workin for the weekend!
    Reputation: -Todd-'s Avatar
    Join Date
    Jun 2011
    I swapped a 44mm 100mm Float to a 51mm 120mm Float, which yielded almost the same trail factor... The offset & stretch left me with the same feel with the new fork as the old fork.

    I was very pleased with the change, the extra length and the offset did great things for my confidence on the bike.

  8. #8
    mtbr member
    Reputation: MikeDee's Avatar
    Join Date
    Nov 2004
    I went from a 38 to a 46 mm offset on a Reba fork. The 46 made the steering a little lighter at slow speeds. Don't notice any difference at higher speed. I like the 46 a little better, but the difference is subtle.

  9. #9
    mtbr member
    Join Date
    Mar 2009
    I would get the 51 if you can wait. There is/wasa guy on MTBR who was selling new Pikes. Maybe he has one with 51mm? I dont remember his name, maybe colorado Bob?I think he was selling them for $750 or $799, it was a good price.

  10. #10
    mtbr member
    Join Date
    Mar 2013
    I have a Pike with a 46mm offset... thinking about getting the Evil Following which is designed for 51mm. Hopefully not the end of the world going with a 46mm offset fork. Really don't want to buy another Pike.

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