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Sora Groupset with 105 Rear Mech

JahmooJahmoo Posts: 168
edited August 2014 in Workshop
Hi Guys,

Having some issues with my Sora Groupset, just purchased Ex Demo bike and Sora not as nice as could be.

Demo ride showed me that it was not set up correctly, so LBS adjusted, worked ok, but still seemed to work its way out of gearing.

Guys at LBS assured me as some on here did also, that set up correctly, Sora is good.

I decided to purchase demo bike and when I picked up the bike, again I was assured all was as good as can be.

53mls in and gears are already jumping, slipping and just a pain, all happening in mid gearing.

Could this just be my LBS not adjusting correctly, or a problem with the rear mech... Love the bike, but you know how it is, when riding, you do not need a gear change to be like a bag of spanners.

Help needed, as said bike great apart from this issue... As heading suggests,would changing the rear mech to 105 mech make any difference, as budget was spent on bike and upgrade so early is not an option.

Posts

  • pinarellokidpinarellokid Posts: 1,208
    probably cable stretch, its quite common. once re adjusted im sure it will be right, if its all new its just a case of setting it up correctly
    Specialized S Works SL2 . Campagnolo Record 11spd. rolling on Campag Zonda wheels

    http://app.strava.com/athletes/881211
  • nigelgosnigelgos Posts: 168
    I'd reiterate what others have said, Sora is fine. Cable stretch is a good shout.
  • Ben6899Ben6899 Posts: 7,203
    ***DO NOT TOUCH THE HIGH AND LOW LIMIT SCREWS***

    Give the barrel adjuster (at the back of the mech where the cable enters) a quarter-turn tweak (to tighten the cable) and give it a ride up the street. If necessary, another quarter-turn and another test ride. Keep a track of where you start on the barrel adjuster and how many turns - be methodical.
    Ben

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  • Old_TimerOld_Timer Posts: 262
    Agree with the advice given above, here is a video from the Bike Radar youtube channel I used to check the indexing on my RD, it helps to also have a good manual that walks you through the steps. I have several and the Park Tool Co, Big Blue Book is a good start. Lennard Zinn has several, also.

    https://www.youtube.com/watch?v=On57Tl9qYRM&list=PLhX4qGpWXV9uoHvt8KU5HRilqta5AvrMx
    Lets just got for a ride, the heck with all this stuff...
  • arlowoodarlowood Posts: 2,380
    Good video link from Old-Timer above

    However - still think this is the most straightforward instructional video on how to index your rear derailleur

    https://www.youtube.com/watch?v=SkzvfCaIbyQ
  • JahmooJahmoo Posts: 168
    Thanks guys, appreciate the helpful comments and the links to the video's...

    Something I should know, but have taken it for granted that a good service from my LBS should be good enough, new bike and more miles means I should know how to adjust...

    I now know how to adjust Disc Brakes, so never know, might get good at tinkering soon enough ;)

    Away on business for a couple of days, I will get straight on it when back Wednesday evening and let you know how it turns out :)
  • andy_wrxandy_wrx Posts: 3,396
    Throw money at it with a 105 rear mech and it'll make no difference at all

    Set it up correctly however, and it'll be fine
  • JahmooJahmoo Posts: 168
    Old_Timer wrote:
    Agree with the advice given above, here is a video from the Bike Radar youtube channel I used to check the indexing on my RD, it helps to also have a good manual that walks you through the steps. I have several and the Park Tool Co, Big Blue Book is a good start. Lennard Zinn has several, also.

    https://www.youtube.com/watch?v=On57Tl9qYRM&list=PLhX4qGpWXV9uoHvt8KU5HRilqta5AvrMx

    OK, thanks for all the comments, I have not bothered with adding to the Groupset, but followed the video, set up and got it working well.

    But as always, after a couple of rides it seems to unset itself and starts to become clunky and getting in to gear a mare... You know how it is, makes your ride painful. This is what has happened a couple of times with the LBS setting it up twice now and it works it's way out of sync.

    Is this standard, or could there be another issue?
  • dinyulldinyull Posts: 2,962
    Could be the cable itself. I've spent many hours trying to perfect gear indexing only to find out the cable has frayed inside the shifter. I'd give that a look.

    Also, how often are you cleaning the bike/lubing the chain? I used to neglect mine and if you don't keep on top it can soon become un-ridable. Quick clean and lube once a week should keep it going.
  • It's not standard at all of course. It's worth getting the cabling replaced (inners and outers) then at the very least you've eliminated that as a source of the issue.
  • oxomanoxoman Posts: 7,334
    Have Sora on my wet bike have several thousand wet miles without any adjustments, just a bit of chain lube occasionally and lubing the rear mech pivot points. Is the adjuster barrel loosening off during riding hence the fact it reverts to dodgy shifting.
    Too many bikes according to Mrs O.
  • JahmooJahmoo Posts: 168
    The bike was purchased only 3 weeks ago, it was an ex demo, but I was told it had only been used 7 times.

    I will have another chat to my LBS, as even my cheap Groupset on my hybrid works well and was fitted about a year back and no adjustment needed...

    Just a pain and makes long rides a pain....

    Cheers for advise :)
  • JahmooJahmoo Posts: 168
    Roubaix at the LBS. I am away on business till Friday afternoon, so told them to have a long hard look at it and please sort it out.

    Cables, rear mech, check the lot, if still problem, please change it :)

    Will see on the weekend!!!
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