Chain Slipping

ed1973

Bit of a mystery, I have a Shimano HG500 11-42 10 speed cassette and in the second highest gear 13t cog the chain slips when I put the power down.
I’ve checked a number of things:
Visible wear on the cog - nothing obvious
Chain wear - measured with chain tool and chain is fine
Chain length - fine
Gear indexing- all fine
So am I missing anything else?
Any help is appreciated.

InconveniencedBadger

Limit screws maybe? Or did you check that those were okay when checking the indexing?

robertpb

Bent cog tooth?

ed1973

Thanks for the ideas, I’m going to check out for a bent cog tooth, not thought of checking the limit screws how would the limit screws effect the slipping on the second highest cog?

cooldad

They wouldn't.

Check for a stiff link in the chain.

02gf74

cooldad wrote:

They wouldn't.

Check for a stiff link in the chain.

If it was a stiff link, surely the problem would be worse on the smallest sprocket than second from smallest.

Is the sprocket in question the one used the most so it's worn?

Have a good look at the sprockets, last time something like this was posted it turned out there was some grass or other stuff in between the sprockets.

ed1973

Checked all those very closely and nothing stands out at all, the mystery continues!!

02gf74

Well in that case the only explanation is your bike is possessed by a malevolent supernatural entity..

Rub six cloves of garlic over the chain and hang an inverted crucifix off the derailleur.

ed1973

02GF74 wrote:

Well in that case the only explanation is your bike is possessed by a malevolent supernatural entity..

Rub six cloves of garlic over the chain and hang an inverted crucifix off the derailleur.

Garlic hung, priest booked in!
‘The power of Christ compels you’ shouted at the bike.

JBA

Have you checked the B-screw?

ed1973

JBA wrote:

Have you checked the B-screw?

Not yet. What should I look for?

robertpb

02GF74 wrote:

Well in that case the only explanation is your bike is possessed by a malevolent supernatural entity..

Rub six cloves of garlic over the chain and hang an inverted crucifix off the derailleur.

You missed out the bit about running naked around the garden at midnight.

ed1973

robertpb wrote:

02GF74 wrote:

Well in that case the only explanation is your bike is possessed by a malevolent supernatural entity..

Rub six cloves of garlic over the chain and hang an inverted crucifix off the derailleur.

You missed out the bit about running naked around the garden at midnight.

Nope did that last night, neighbors weren’t very impressed as I thought it was someone else’s garden you had to do this!

robertpb

Ed1973 wrote:

robertpb wrote:

02GF74 wrote:

Well in that case the only explanation is your bike is possessed by a malevolent supernatural entity..

Rub six cloves of garlic over the chain and hang an inverted crucifix off the derailleur.

You missed out the bit about running naked around the garden at midnight.

Nope did that last night, neighbors weren’t very impressed as I thought it was someone else’s garden you had to do this!

Running around someone else's garden exhibitionist came to mind.

ed1973

robertpb wrote:

Ed1973 wrote:

robertpb wrote:

02GF74 wrote:

Well in that case the only explanation is your bike is possessed by a malevolent supernatural entity..

Rub six cloves of garlic over the chain and hang an inverted crucifix off the derailleur.

You missed out the bit about running naked around the garden at midnight.

Nope did that last night, neighbors weren’t very impressed as I thought it was someone else’s garden you had to do this!

Running around someone else's garden exhibitionist came to mind.

I thought I was being an exorcist (get it?)

02gf74

Exercisist.

Avoneer

Have you recently changed your chain?

Is your rear mech hanger alignment spot on?

Have you recently changed anything?

ed1973

Avoneer wrote:

Have you recently changed your chain?

Is your rear mech hanger alignment spot on?

Have you recently changed anything?

Thanks for the reply, I hav not changed anything, I did and the whole lot together:
Chain
Cassette
Mech
It was working all fine when I made the change about 300 miles ago, the only possible thing I can think is the cassette is worn. The cog it slips on is the one most used for my commute. Could it have worn in 300 miles?

figbat

There’s not some mud, grass or a stick caught between the cogs is there?

Killerclown

I’d say giving the B screw and adjust may help.

ed1973

Killerclown wrote:

I’d say giving the B screw and adjust may help.

So I’ve checked the b screw and adjusted it to the recommended (by parktools) to 5-6mm and still no better, still slipping, the mystery continues.

JBA

As mentioned previously have a close look and check there is nothing between the sprockets preventing the chain from seating properly.
Someone on here had a similar problem a few months ago and it turned out to be a long grass stalk wrapped tightly around the cassette.

steve_sordy

I once had a similar problem, turned out to be the rivets that hold the cassette gears together had failed. Remove the cassette and take a look. It may be a similar problem, if not the rivets, then maybe the spline teeth that hold the gear onto the freehub, or even the splines on the freehub might be a bit dodgy in that area allowing the gear to move and let the chain slip.

ed1973

Killerclown wrote:

I’d say giving the B screw and adjust may help.

I’ve checked b screw and it’s at the (recommended by parktools) 5-6mm gap
The mystery continues.
The other thing I have checked is whether the mtb goatlink is causing so I’m in the middle of taking the link off, but then my mech won’t go back in the hanger with the rear wheel on!

ed1973

Could it be I have a bent hanger or mech?

steve_sordy

Ed1973 wrote:

Could it be I have a bent hanger or mech?

If your shifting is fine in the biggest and smallest gears I suspect that your mech and hanger are correct. But I would be happy to be proved wrong. When I first went 12-speed, I had loads of odd shifting problems that none of the usual tricks would fix. The bike shop told me that the mech arm was bent. On 12-speed, everything is smaller and closer together so the margin of tolerance is smaller. This requires the mech and the mech arm to be spot on. After a few trips to the bike shop for random unfixable-by-me problems, I bought a mech hanger alignment tool. But (of course!) as soon as I used it once I never had another problem!
I'm not sure whether to conclude that it was the best value for money tool I ever bought, or that the bike shop was doing a bad job every time! :?

Vino'sGhost

Killerclown wrote:

I’d say giving the B screw and adjust may help.

Please ignore killer clown, he’s a clueless moron

ed1973

Right so I spent the best part of yesterday trying to fix this issue, I tried the following:
Replaced gear cable
Indexed gears
Adjusted b screw
Straightened mech hanger
Checked frame where hanger goes
Took cassette off (cassette comes in 3 bits with the 11 and 13t cog being separate, checked wear on all. The only thing I noticed was in the cassette there is about .5mm of lateral play where they are riveted together but at the point of play there are no rivets)
Put cassette back on and tightened (noticed cassette has about .5mm of horizontal play while on hub)
Stripped hub and degreased ball bearings
End result.......
Chain still slipping!!
Ahhhhhhhhhhhh

robertpb

Get a new cassette because that sounds like it's the problem. If it fixes it job done, if not you will have to buy a new cassette sooner or later so you haven't wasted your money.