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Indexing issue
This is driving me berserk. On my spangly new Park stand the gears are perfect and shift seamlessly (one year old Forme Ax Edge Pro with Ultegra 10 sp cassette). Mount up and pedal away and I miss changes up and down - not always on the same shift - and only 1:20 probably go awry. What might be wrong?
I'm new to bikes (after 30 years away) but have been known to strip and rebuild an engine with impunity so not a complete novice.
MT
If you're new please join in and if you have questions pop them below and the forum regulars will answer as best we can.
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36 comments
It would be tension issue (e.g. cable stretch) so just visually check the indexing when it is on your stand....shift through all the gears and make sure everything lines up vertically. If you need a new cable, the derailleur won't be moving the correct distance for each shift. This assumes you have followed Shimano's instructions for indexing it first.
You could then try this while sitting on the bike to see if your weight is causing deflection -- you can usually see the rear mech from the saddle if you can't backpedaling should be smooth. If everything looks good statically then you'd have to ride the bike (since that is where the problem shows up). Ideally you'd have a friend behind you to see if he sees something odd.
The infrequent nature of the problem doesn't seem like cable stretch although it wouldn't hurt to replace it. Something is randomly causing the derailleur not to move the correct distance.
A long shot but I noticed this other road.cc thread on Ultegra 10-speed cassette issues http://road.cc/content/forum/137954-cassette-spacer-confusion
If you follow the link provided by a commenter http://www.bikeradar.com/forums/viewtopic.php?f=40004&t=12991943&p=19211950 you will see a comment about wobbly cassettes if the spacers are installed incorrectly. You have a relatively new bike so possibly the builder may have created the problem.
Cables most likely, also check the top jockey wheel on the rear derailleur spins smoothly and can move a little side to side as it is supposed to.
Totally agree these would be things to check but wouldn't these also show up on the stand?
Could something related to his weight being applied cause this? For example: deflecting the chain ring which would mess up the high/low setting or the wheel hub being too free?
Cables in good shape?
Having read my post I would like to point out it was the engines that were stripped and not me.
I hope that clears up any confusion.
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