Results 1 to 8 of 8
  1. #1
    Senior Member
    Join Date
    Oct 2014
    Posts
    1,186

    Fixer upper project

    My boy has shown a bit of interest in mountain biking lately. As he flits from one hobby to another, we're a little reluctant to buy him a brand new bike that may not get used much. However, his current bike needed replacing as he had outgrown it so we found a suitable replacement on Gumtree. It's a Specialised Hardrock bike that needed a little attention. When we went to view/pick it up, the guy said the rear gears needed adjusting and he wasn't joking. Only a couple of the gears could be changed. On closer inspected it was obvious the rear derailleur was damaged. When manually pushing it to the lowest gear, the cage was going into the spokes. I took my chain tool with me and the chain was well worn so that was another thing that needed replacing and it seemed reasonable to suggest the cassette would need replacing. It was also in need of a decent clean. The jockey wheels were caked in crap. Anyway, we agreed a price with the replacement parts and work in mind.

    I tried salvaging the RD but it was toast. Got a replacement for 18 which seemed reasonable enough. Fitted it the other day and replaced the gear cable. Still not quite perfect after indexing but thought the new chain and cassette may help. In the process of replacing the cable, I noticed some of the outer cable was a little worse for wear.

    Anyway, I received the new bits today and installed everything. Shifting is pretty good at the rear but not perfect at the front. I put a new cable on and set about setting the FD up as new. After adjusting the tension it shifts up no problem, but shifting down it misses out the middle ring and goes straight from big to small. I'm guessing I need to adjust tension a little more, but as I've never worked on a triple, I'm not sure what exactly to adjust. Any suggestions please?

  2. #2
    Senior Member
    Join Date
    May 2014
    Posts
    4,167
    I'd imagine the RD hanger is probably bent, if the RD itself was damaged.

    Just some random thoughts...

    -Is the FD absolutely straight/parallel to the chainring?
    -If you detach the FD and hold the cable under tension and click the shifter, are you getting three distinct positions? --Triple FDs need indexing much like the RD as there is not just the hi/low position to find. There may be some compromise, eg you might have to put a bit more tension on the cable whilst still allowing it to shift to the inner ring.
    "Training is also a battle" - Kim Jong-Un

  3. #3
    Senior Member
    Join Date
    Oct 2014
    Posts
    1,186
    Cheers for the reply PRS.

    I think the hanger is probably bent. As it's shifting fine at the back, I'm just going to see how it goes for now before replacing.

    The FD is parallel to, and is the correct height from the big chainring. Gonna have a fiddle with the tension and barrel adjuster to see if I can get it working.

  4. #4
    Senior Member
    Join Date
    Jul 2004
    Posts
    1,631
    If the RD is shifting fine and the chain runs smoothly, then I see no reason to assume that the rear mech hanger is bent?

  5. #5
    Senior Member
    Join Date
    May 2014
    Posts
    4,167
    The hanger can be easily bent back by your LBS, using the correct tool... took my bloke literally 10 secs, didn't even charge for it.
    "Training is also a battle" - Kim Jong-Un

  6. #6

  7. #7
    Senior Member
    Join Date
    May 2014
    Posts
    4,167
    Excellent! Just tweakage required?
    "Training is also a battle" - Kim Jong-Un

  8. #8
    Senior Member
    Join Date
    Oct 2014
    Posts
    1,186
    Quote Originally Posted by PRSboy View Post
    Excellent! Just tweakage required?
    Aye, minor adjustment and it worked.

    Next step is to teach the kid to not put the bike on the ground with the drivetrain on the underside of the bike!!!

Posting Permissions

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