Chain slip

[SwtCraigMachine]

Hello wise hubbers,

 

I am building a cheapie bike for my girlfriend and am having a problem with the chain slipping on the cassette.

 

When I originally bought the donor bike, the guy said there was a problem, and the chain slipped heavily on the smallest 3 or 4 sprockets. First port-of-call - I checked the chain length for stretch and it seemed almost new. So I figured that wasn't the problem - it must be the cassette. So I bought a used cassette that looked to be in good nick (the teeth were all still there, symmetrical and not shark-toothed). Now the chain slips in nearly every gear (admittedly, less and less on the bigger sprockets, but this might just be because there is less force on the chain/teeth in the lower gears).

 

I have tried lubing the chain, checking it for sticky/frozen links and adjusted the length to try keep it tight. I have played with the derailleur b-screw and cable tensions, and checked (visually) that the derailleur is not bent.

 

I am fast running out of ideas! Is there anyone out there who can offer some insight into how I can try fix this? I'm losing brownie points fast

 

Happy (slip-free) pedalling

[David Marshall]

could also be a problem with the freehub.

[NINER_boy]

Is it the appropriate chain, eg. 7spd, 8spd, 9spd???

 

Could be an easy / cheap fix.

 

Hope you get it sorted

 

PS, take to your LBS and have them check the hanger. Visually impossible to inspect...

Even small deviations make a big difference

Edited July 24, 2012 by NINER_boy

[SwtCraigMachine]

Some more deets - I just installed a brand new rear hub, so I don't think it's the freehub...

 

The chain came with the donor bike (8-speed), so I assume it used to work... But I suppose maybe not

 

Thanks for the input guys!

 

Another quick, semi-related question - has anyone ever tried using a 8-speed RD with a 9-speed shifter and cassette (or 9- 10-speed)? Because the RD isn't indexed like the shifters (it has infinite range of motion), I can't think of any reason this wouldn't work...?

[Bike Mob]

still think chain is too new for the used casssettes... try an old chain on each cassette and see.

[Bike Mob]

Some more deets - I just installed a brand new rear hub, so I don't think it's the freehub...

 

The chain came with the donor bike (8-speed), so I assume it used to work... But I suppose maybe not

 

Thanks for the input guys!

 

Another quick, semi-related question - has anyone ever tried using a 8-speed RD with a 9-speed shifter and cassette (or 9- 10-speed)? Because the RD isn't indexed like the shifters (it has infinite range of motion), I can't think of any reason this wouldn't work...?

 

 

I dont think 8 speed chain will work.

 

Also the 8rd and 9 sp shifters may not work either... I tried 9 sp index on 10sp derailer and had issues. could only get half the cassette indexed ok, then on each extreme it was problematic

[Mountainman44]

still think chain is too new for the used casssettes... try an old chain on each cassette and see.

I agree with Zilla on this one, I have had similar problems which disappeared when I installed an older chain.

[DaLoCo]

My chain was also slipping , especially when putting a little bit of power like going uphill. Took it to the LBS, dude reckons it was a bent hanger and a indexing slightly out. The chain has not slipped again.

[TiBones]

It is a matter of chain wrap. There is a small adjusting screw on the back of the derailleur. Screw it out so that the whole derailleur mech moves forward and wraps more chain around the sprocket.

 

The little "B" Screw in the pic

 

I see that you did play a bit with the B screw. If the der is too "upright" the chain only wraps around about 90 degrees. You need to get that as close to 120 deg without the guide pulley fouling the cluster

 

 

Edited July 24, 2012 by TiBones

[Greg29]

It is a matter of chain wrap. There is a small adjusting screw on the back of the derailleur. Screw it out so that the whole derailleur mech moves forward and wraps more chain around the sprocket.

 

The little "B" Screw in the pic

 

I see that you did play a bit with the B screw. If the der is too "upright" the chain only wraps around about 90 degrees. You need to get that as close to 120 deg without the guide pulley fouling the cluster

 

 

 

Good post TiBones!