danallen

Picture denied, not enough posts yet.
Ten speed Ultegra cs-6700 - can you tell by looking at this picture if these cogs are OK?

I just put a new chain on my bike. I thought the cogs looked OK. Have had no problems till now. Now, it seems I cannot get the gears indexed. They keep acting as if the derailleur is between gears. I try tightening the cable with the barrel adjuster, loosening... On the bike stand, pedaling by hand, sooth shifting. I start riding, chachunk... Chunk... Cha-cha, CHUNK...

Am I going to have to become the proud owner of a new cassette to run this new chain?

What are your thoughts?

Thank you.

delbiker1 

How many miles on that cassette and the old chain. It sure sounds like the cogs are not matching up with the new chain. Not unusual it they had a lot of miles.

sour01

I learned this the hard way. How long had you used the old chain before changing it? Did you compare the new chain's length with the old to see how much wear? The first chain I ever replaced on my old bike was OLD and the new chain jumped cogs like crazy. Like your situation - everything worked fine on a stand.

cb400bill

One more post gets you to ten. Then you can post pics

popeye

Cassette skips on a new chain = new cassette. You don't need a Park chain checker but it sure is convenient.

HTupolev

Did you put the chain on the right way? The outer plates are different between the two sides of 10-speed and 11-speed Shimano chains, and the correct plates need to face outward.

danallen

The new chain is SRAM PC 1051. The LBS said this chain works with Shimano.

Maybe I put on backward. I did not notice any difference in how the links are marked on the two sides, so I put it on so the labels are oriented right side up on the top from top of rear derailleur to chain ring, when viewed from right side of the bike.

danallen

I bought this bike used about a year ago on eBay for $700. It is a madone 5.1 model year 2009 I think I've riden it maybe a thousand miles or more since I got it. I don't know how old chain was. I did check the length of the chain removing extra links for the new chain so that it would match the length of the old chain. Possible that I didn't get that exactly right, because I'm not sure correctly took into account the master link or whatever it's called that connects the chain together so I'll check that

danallen

This is the cassette

HTupolev

Does the quick link have any markings on it indicating direction? Some SRAM chains are non-directional for the normal links, but have a directional quick link.

shelbyfv

Time for a new cassette. You have unknown mileage on that one and you can't judge wear by looking at it.

DaveSSS 

Chain skip normally occurs on only a few of the most- worn sprockets and then only upon heavy pedaling pressure.

Dave Mayer

You don't have a 6700 cassette - the lockring is clearly labelled: 7800, meaning Dura-Ace, unless someone inexplicably swapped out your lockring. The cassette doesn't look particularly worn, although if the original owner of the bike was putting in any decent miles, the chain should have been replaced at least a dozen times since purchase, and the cassette replaced 4+ times.

7800 cassettes new cost around $250 when you could get them; even used now they will fetch $50 at least. I am sure your local shop would be pleased to take this used and worthless cassette off of your hands for replacement. Then out the back door onto Ebay for mechanics beer fund money.

Are all of the cogs skipping, or only a few? Or is the problem with the chainrings? Or a mangled or mis-installed quick link? Too many vague clues here.

danallen

Yes. There is an arrow on the quick link, which is pointing in the correct direction.

Carbonfiberboy 

Yep. Plus I usually find my most used chainring will start jumping after about every 3rd cassette change, usually only on out of the saddle efforts.

danallen

I am really glad you pointed out the label on the lock ring. All the other components are marked Ultegra. When I checked the Trek archive awhile back, I failed to notice the original cassette was 105, not Ultegra or Dura Ace. What is on there now appears to be Dura Ace 7800 12-27 I found a 7800 new but with different number of teeth for $150:


New 6700 is available for about $60.

Not all cogs are affected. I read somewhere this problem can settle down after putting on a new chain. The problem was worse, now it is affecting 2-3 cogs in the middle of the rear cassette, when running the small chain ring.

The quick links appears correctly installed and moves as freely as any of the other links.

The chain rings are not jumping at all.

danallen

Every single comment is helpful, thank you.

eflayer

I have replaced about a zillion chains. In my haste a couple of chains ago, I accidentally threaded the chain over one of the metal guides on the rear derailleur. I rode the bike for a number of miles but things were not shifting just right. Came home to find out I screwed up how chain was routed. Fixed in about 2 minutes.

znomit

I bought a second hand MTB mid year. Broke a rear spoke about a month later (maybe 100 miles on it by then). LBS mechanic fixed the chain routing for me while he did the wheel. No idea how long the original owner had been riding it like that.



OP I am disappointed, I clicked thinking this was going to be a new bike thread.

nycphotography

IME chain skip is more often caused by
a misaligned [derailleur] hanger
than by a worn cassette, and we never think of the derailleur hanger first.

eduskator

It looks used, but not worn-out to a point where you absolutely need to change it. However, if I were you, I'd change it & maximise your new chain's lifespan.

masi61

+1 on checking this. Your photo of the rear triangle shows heavy wear on the paint and the cassette is really dirty. Sounds like your bike is heavily used, not lightly used.

How do rear dropouts outs suffer that type of paint chipping? Just curious.

Psimet2001 

Hanger isn't aligned.

Rocket-Sauce 

hanger is bent

goenrdoug

And something is taped together on the NDS?

What are we looking at?

Now that you can post photos, OP, maybe you'd like to post a couple more showing us more of the bike?