Advertise on Bikeforums.net



User Tag List

Results 1 to 8 of 8

Thread: 84 trek 520

  1. #1
    Senior Member
    Join Date
    Aug 2013
    Posts
    60
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)

    84 trek 520

    My 84 trek 520 has a stripped drive side crank arm. As far as ive read i have an sr crc t-301 50/45/28. Whats my best bet here? Can i replace just the arm and keep the gears? With what crank if so ? I was also looking into running a double instead of a triple, then i was reading i might need a different bottom bracket and gears etc etc. Any help would be much appreciated

  2. #2
    Senior Member
    Join Date
    Dec 2010
    Location
    Above ground, Walnut Creek, Ca
    My Bikes
    7 single speed road
    Posts
    4,363
    Mentioned
    5 Post(s)
    Tagged
    0 Thread(s)
    yes, you can replace the arm(s) and keep the gears. forget the double unless you want to replace a number of components.

    here's some options on ebay. 110 bcd triple in Bicycle Components & Parts | eBay

  3. #3
    Senior Member
    Join Date
    Sep 2010
    Posts
    2,855
    Mentioned
    4 Post(s)
    Tagged
    0 Thread(s)
    If the pedal threads are stripped a Helicoil insert will repair the threads stronger than new.

  4. #4
    Senior Member
    Join Date
    Aug 2013
    Posts
    60
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    I havent been able to find someone to do helicoil yet. Is there a good vintage / current crank that i can use on my suntour cyclone mk-II GT and mk-II front.with a 11-32 casette. double or triple.

  5. #5
    Mad bike riding scientist cyccommute's Avatar
    Join Date
    Nov 2004
    Location
    Denver, CO
    My Bikes
    Some silver ones, a black one, a red one, an orange one and a couple of titanium ones
    Posts
    15,960
    Mentioned
    24 Post(s)
    Tagged
    0 Thread(s)
    Quote Originally Posted by agchopz View Post
    I havent been able to find someone to do helicoil yet. Is there a good vintage / current crank that i can use on my suntour cyclone mk-II GT and mk-II front.with a 11-32 casette. double or triple.
    You can use just about any crank with your components, from cotter pin (Ugg!) to external bearing. It makes no real difference. If you want vintage, go to Fleabay.
    Stuart Black
    Solo Without Pie. The search for pie in the Midwest.
    Picking the Scablands. Washington and Oregon, 2005. Pie and spiders on the Columbia River!
    Days of Wineless Roads. Bed and Breakfasting along the KATY
    Twisting Down the Alley. Misadventures in tornado alley.
    An Good Ol' Fashion Appalachian Butt Whoopin'.

  6. #6
    Senior Member bikemig's Avatar
    Join Date
    Apr 2012
    Location
    Middle Earth
    My Bikes
    A lot of old bikes and a few new ones
    Posts
    4,951
    Mentioned
    36 Post(s)
    Tagged
    1 Thread(s)
    Sugino makes good looking triples and compacts that will look right on that bike if you decide to swap out the crank (you may need to swap out the BB as well).

  7. #7
    Senior Member
    Join Date
    Feb 2012
    Location
    SoCal
    My Bikes
    1983 Trek 620, 2010 Roubaix
    Posts
    370
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Quote Originally Posted by agchopz View Post
    I havent been able to find someone to do helicoil yet. Is there a good vintage / current crank that i can use on my suntour cyclone mk-II GT and mk-II front.with a 11-32 casette. double or triple.
    Where are you located? Putting a helicoil in to fix a stripped pedal thread shouldn't be that big a deal... If the nearby shops can't do it, can they refer you to someplace that can.

  8. #8
    coprolite fietsbob's Avatar
    Join Date
    Jun 2010
    Location
    NW,Oregon Coast
    My Bikes
    7
    Posts
    3,096
    Mentioned
    44 Post(s)
    Tagged
    0 Thread(s)
    the right crank arm from 84 is no longer made , anymore .

    if the thread repair scheme is not chosen , a whole crankset and BB and starting over is a lower resistance route than trying to find old parts.

    after all this time ..

    a crank with a similar tooth count installed with the same chainline (right BB to go with it)
    would let the old derailleurs continue the shoving the chain sideways , job..

    cant help you from a keyboard , but the warm bodies at Bike shops where you live, may .

Posting Permissions

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