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  1. #1
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    2007(?) GT Avalanche 3.0 tinker toy question

    Now that Iíve purchased a full squish trail bike, I want to do some tinkering on my old 26Ē GT Avalanche 3.0. Itís either a 2007 or 2008 model. Iím having a terrible time finding information on the bike, and I am clueless about bottom brackets and crank sets.

    My immediate goal is to change the crankset out for a single disc, and then potentially convert to single speed. I found somewhere that the bottom bracket is a 68mm x 113 width. Would a shimano XT crankset with 68/73 bottom bracket included fit this bike?

    Iím about to update with short stem and some wide 35mm clamp bars as well. I have some more ideas for this bike, so it may turn into a quasi-build thread, but if anyone can help with this first question, it would help me tremendously! Thanks!

  2. #2
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  3. #3
    Sneaker man
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    yep, if it's 68 then its threaded not press fit, then the 68/73 comes with 2 (2.5mm) spacers that you put on each side to take up the space of the 73 (obviously with a 73mm shell you don't use the spacers)

    In the old days you had 68 or 73mm shells, then a whole bunch of axle lengths (eg 113) to fit the cranks/offset for the frame. These days, still - - for the external BB widths 68/73mm, but the cranks all have the same axle width, so you use the correct spacers and bolt it all together.
    All the gear and no idea.

  4. #4
    Hardtail Steel Forever
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    You could convert that one to single speed and not need a new crankset at all. Ditch the inner and outer rings and put a narrow wide ring on the center.

    Otherwise, you just need a normal BSA bottom bracket for whatever crank spindle you're going to replace it with.
    WTB: Med Bontrager Ti Lite, PM Me...

  5. #5
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    Quote Originally Posted by jestep View Post
    You could convert that one to single speed and not need a new crankset at all. Ditch the inner and outer rings and put a narrow wide ring on the center.

    Otherwise, you just need a normal BSA bottom bracket for whatever crank spindle you're going to replace it with.
    The crank is on of those cheap ones that is riveted together so I donít think it will work like that, but again, I donít know a ton about this stuff yet.

  6. #6
    Hardtail Steel Forever
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    Quote Originally Posted by MOONER718 View Post
    The crank is on of those cheap ones that is riveted together so I donít think it will work like that, but again, I donít know a ton about this stuff yet.
    I tried to zoom in and it looked like a normal spider, but definitely, if it's welded or riveted, no use messing with it.
    WTB: Med Bontrager Ti Lite, PM Me...

  7. #7
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    I'd stick with older stuff, in many areas you could build a sweet bike at the coop with stuff people are throwing out.

    Also, 35mm stem/bar standard is only for looks/obsolescence.

  8. #8
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    Quote Originally Posted by Zowie View Post
    I'd stick with older stuff, in many areas you could build a sweet bike at the coop with stuff people are throwing out.

    Also, 35mm stem/bar standard is only for looks/obsolescence.
    Only reason I added the new bars/stem is I replaced the bars on my full suspension bike with Renthal fatbar lite and so I had an extra 35 bore bar to use on the GT. The old LP carbon bars on the gt were only 23.8 inches wide so itís a nice change.

  9. #9
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    2007(?) GT Avalanche 3.0 tinker toy question-aaef638a-0310-40ed-86a7-4a9d6ca13e4d.jpg

  10. #10
    Sneaker man
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    Freakin hell, those LP bars would have cost more than the whole bike!...mmmmmmmmmmmmm LP yum next best thing to old Nuke Proof
    All the gear and no idea.

  11. #11
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    Quote Originally Posted by mik_git View Post
    Freakin hell, those LP bars would have cost more than the whole bike!...mmmmmmmmmmmmm LP yum next best thing to old Nuke Proof
    TBH I have no idea what the LP bars were worth. I bought them probably 7 years ago on eBay at a price I thought was reasonable. Donít remember what I paid for them.

  12. #12
    Sneaker man
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    yeah well, since nuke proof stopped making propper stuff, LP became my wish for brands, but since they stopped, now schmokle...but not for $300
    All the gear and no idea.

  13. #13
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    Quote Originally Posted by MOONER718 View Post
    Only reason I added the new bars/stem is I replaced the bars on my full suspension bike with Renthal fatbar lite and so I had an extra 35 bore bar to use on the GT. The old LP carbon bars on the gt were only 23.8 inches wide so itís a nice change.
    Can't complain then, fit > standards.

  14. #14
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    Quick update...

    So I ordered some tektro mechanical brake levers off eBay for $8.50, so I got to remove the front derailleur finally. I hated that thing so much.

    Then I cut all the teeth off the large chainring to keep it as a bash guard. Going to run it as 1x8 for awhile before I decide if Iím going single speed or not. If I go SS, Iíll eventually replace the crankset and chainring.

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