new cassette, new chain, chain slips when NOT under strain

[SatNavSaysStraightOn]

Hunting for ideas. my road bike has had new wheels & hub, new cassette & new chain less than 2 weeks ago and initally everything was fine. However, these last few days riding, the chain has started slipping badly when it is not under strain or when I am spinning. Standing on the pedals, or just putting much more 'power' down it is completely fine and no issues.

Gear changes are fine, really smooth and almost immediate. (front derailer had some minor issues after a waterbottle leaked orange juice over it and stuck everything together... but that has been cleaned up and more or less back to how it was, and this appears to be a rear cassette/chain slipping issue rather than front derailuer related from what I can tell)

Its a triban 3, with fulcrum racing 7 CX wheels, shimano hub, SRAM PG-850 11-28 cassette, & matching SRAM chain PC-850. chain was set to same length as original and derailer has no clearance issues with the granny gear (original cassette was 12-26). I didn't appear to need to redo in the indexing (surprised me) but like I said all the gears are there and everything lines up. But I am beginning to wonder.

Any ideas please?

 

[Peteaud]

Have you got an old wheel you could swap over?

Might eliminate the hub

 

[potsy]

I'd try a tweak of the indexing, mine needed it after fitting a new chain/cassette a few weeks ago, just half a turn or so but made the difference

 

[SatNavSaysStraightOn]

Have you got an old wheel you could swap over?

Might eliminate the hub

only the old wheel that came off the bike which was not ideal. the stock T3 wheel which had issues. still has old cassette on it as well.

 

[Peteaud]

only the old wheel that came off the bike which was not ideal. the stock T3 wheel which had issues. still has old cassette on it as well.

Did it slip on that one?

I would swap the cassettes, put the old wheel on and see what happens.

 

[SatNavSaysStraightOn]

Did it slip on that one?

I would swap the cassettes, put the old wheel on and see what happens.

the old wheel has serious cup & cone issues and grates somethign chronic. hope was new wheels would solve the problem.

tis bad enough for me to be taking the mtb to college tomorrow rather than the road bike. I was wondering about the indexing, simply because the new cassette was a spacer behind it - the old one does not, but different freehub so different requirements. may LBS it on friday if I am not at my mothers/planning a bike ride.

 

[Peteaud]

Have you re set the rear mech?

If one has a spacer and the other does not then they may be a small amount out.

 

[SatNavSaysStraightOn]

Have you re set the rear mech?

If one has a spacer and the other does not then they may be a small amount out.

that's what I was wondering about. but I assumed that the hub size might take that into account, the spacer being behind the cassette should through the 8 speed cassette back to where it originally was 'so to speak'... shouldn't it? (the one thing I hate more than anything else is re-indexing gears.... tis why my tourer was a rohloff hub!)

 

[Peteaud]

that's what I was wondering about. but I assumed that the hub size might take that into account, the spacer being behind the cassette should through the 8 speed cassette back to where it originally was 'so to speak'... shouldn't it? (the one thing I hate more than anything else is re-indexing gears.... tis why my tourer was a rohloff hub!)

I am thinking that with the new wheels it might be slightly out?

 

[SatNavSaysStraightOn]

I am thinking that with the new wheels it might be slightly out?

looked "ok" when I looked ta it from behind, though it could be... will look at it in better daylight tomorrow afternoon. thinking about it, it could be slightly off which might account for slipping when not under stain, but staying firmly put when it was, if it was marginally out... Suspect my cackhanded ness at derailer alighnment will result in it being very firmly out by the end of the day though! guessing the inner limitting screw might be the one to tweak marginally if it is an issue with there being a spacer etc... just seems odd that initally it was OK

 

[Cyclist33]

<body><p>Indeexexiexitusingexing

 

[mickle]

Rear mech out of adjustment. Or a stiff link. Or both.

 

[berty bassett]

could you lean the bike up and slowly move pedals backwards - i twill pick up if theres a stiff link and it will also show you if the gearings right as it should be quiet but if its skipping a little your slightly out - think it sounds like a stiff link though maybe the one you joined the chain ? - dont change gear though while going backwards

 

[SatNavSaysStraightOn]

stiff quick link could be an option - it was hell to get it closed, but I have not noticed anything when cleaning the chain. will peep at it this afternoon after college - taking one of the other bikes so as not to do any permanent damage to either me or the bike....

 

[Zofo]

sounds like your derraileur is out of line, you need to set the limit screws up correctly.