Quote:
Originally Posted by stevej37
^^^ Yours is in low gear though....I've never had it happen in any of the low gears.
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What he's looking at is how "stretched" his derailleur is in the low gear. First- he isn't in low gear, but second to low, but that 's not the point- you want to make sure the spring tension on the derailleur isn't too loose- or pulled straight in your "1" low gear.
This video at about 2:30 shows what happens when a derailleur gets stretched too much. I was betting his chain was too long- this is a way to see if it is, and if you can get by with removing 2 links- when he simulated it, the deraulleur got pulled straight / overextended, so removing 2 links was not an option for him. I ff'd to the exact section:
Assuming you cannot remove 2 links in the largest cog - as simulated in the video(what you call "1"), then you are either looking at a stretched chain or a b adjustment as a fix, or a combo of both.
take a screwdriver on the next ride, find a pothole that jumps it, tighten the b screw 1/2 turn or two, remember what you did, see if that fixes the jump on the spot. If not, or the shifting stops working well- loosen b adjuster by same amount, go home and buy new chain.
This is all after you have:
Checked chain for kinks/ tight links
Checked front chainring for bent teeth (side to side)
Lubed Chain
That bike also has a lot of corrosion on it.
Make sure there is :
No slop/looseness in crank bearings
No slop/looseness in reab hub