Hi there,
This may have been covered ad nauseum, but as a newbie, please humour me! My problem is that when I shift into top (7th on the cassette) the chain will not engage properly - it will seem to continually slip, it only does this under load, i.e. when I am riding on the flat or up hills, it works ok when the bike is on a stand. I have fiddled with the high gear adjustment screw but to no avail. All the other gears are working as they should, on all chain rings, it is noly top that will not work properly!
Could the chain be too long? - it snapped last week and stupidly I threw it away without measuring how long it was! Would removing a link cure this? (it is only since the chain went that this has been occurring!)
Cheers
Sam
Cycling Equipment · Public discussion
Slipping chain
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- Cycling Equipment
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- 29 March 2007
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- 29 March 2007
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- SPHDS
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If that gear on the cassette is heavily worn, a new chain will skip.
Do the teeth on the problematic gear appear more worn than the other gears?
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No, I 've just had the whole groupset (minus chain) replaced last weekend as part of a major service (the chain snapped earlier that week)
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This cut from Sheldon Brown's website should help you with chain length:The best technique for setting chain length is to thread the chain onto the large/large combination, without running it through the rear derailer. Mesh the two ends on to the large chainwheel so that they could be connected (outer link meets inner link), then make the chain one complete link (one inch) longer than that. In almost all cases, this will give the optimum length. Here is the link to his article which has explanitory pictures:sheldonbrown.comderailer adjustment.htmlOpen ↗ Also review his comments on derailer adjustment.
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Sam--I'd suggest you take the bike to the LBS where you bought your new cassette, chain, etc., explain your problem, and ask them to fix/adjust.
~ OldGoat -
i find that method almost invariably ends up for my setup with a chain that is at least a couple of links to short.
--brett
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i'd check the cable tension. if you have a little too much, regardless of the limit set, the chain will not want to go all the way down.
in the shimano tech spec they recommend setting cable tension by increasing the tension via the barrel adjuster so that the chain only just makes the jump from the second to top into the top.
i'd say back the tension off say a half turn, then a full turn. if it doesn't resolve, then as others have said ... back to the shop.
--brett
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