Symox

Got a weird one for y'all

I have a bike with a 10 speed 105 brake shifter (ST-5600) with a 105 rear derailleur ( RD-5600 GS long cage - its a triple front derailleur bike) with a Dura Ace 10 speed 11-28 cassette.
Shifting is flawless except going from 2nd to 3rd gear (maybe 3rd to 4th, can't remember)- but its ok going the other direction. I've tried adjusting everything including 11 to 10 speed shim widths, B limit, stroke adjustment as well as cable adjustment and I just cannot get it perfect.

With a 105 10 speed cassette it works fine. The Dura Ace cassette behaves the same on a different wheel.

My guess is the shift increments are ever so slightly different between the DuraAce cassette and 105 shifter. However since it is ok in the other direction I wonder if there is friction in the system. I have new Jagwire Pro cables so I doubt that's the issue.

Any ideas or suggestions?

Thanks

Amt0571

Check derailleur hanger alignment. I had similar issues on a couple of bikes and it always was caused by a misaligned rear derailleur.

Last time it happened with my mountain bike that hesitated to downshift from the 3rd cog to the 4th and the chain rubbed the 2nd cog while on the 3rd. All other gears worked well.

Symox

Yup, had a slight bend when I removed the hanger and compared to a straight edge. I couldn't bend it back perfect without the right tool so I ordered a new one

Thanks!

dsbrantjr

Make certain that the ends of the shift housing are properly prepared with no protruding wires and firmly seated in their sockets, and equipped with correct ferrules where required. Make certain that the housings exit the ferrules/sockets squarely so that the shift cables do not rub against them. If your shift cables run under the bar tape ensure that the housing has not dislodged slightly out of the shifter socket, which can happen while wrapping tape.

Barry2 

So I'm told... even a new hanger may need to be aligned.
But a spare is never a bad idea.

Barry

cxwrench

You should always check a new hanger. They're generally always perfect but where they attach to the frame might not be. I vericy alignment on every new hanger I install.

oldbobcat

There are about 20 years of discussions on this board regarding derailleur shifting problems. Your problems are not unique. Instead of starting a new discussion, why not use the Search function at the top of the page to see what's already been said about them?

70sSanO

You forgot to tell him to get off your lawn.

John

Symox

Got a new hanger and checked with the park tool. It was dead nuts on.

I still can’t seem to get both the 3rd to 4th shift to work consistently without the 10th to 9th slipping. it’s either one or the other. Ugh.

might have to have a shop look at it or just live with it.

70sSanO

When I first read this it didn’t sound like a hanger problem if it only happens with one 10 speed cassette and not the other. Cassette spacing is the same for Shimano 10 speed cassettes.

It could be a bad cassette. It is very expensive and wouldn’t expect it. Is the 10 speed Dura Ace new?

John

Symox

no I got it on Craigslist. Great deal but I guess I know why

ARider2

Do you think you got a fake knockoff part from Craigslist rather than a genuine Shimano part?

70sSanO

With an unknown cassette, the next question is your current chain. It becomes a bit of a rabbit hole trying to find the exact cause.

Position 3 to 4 is 13t-14t, not sure if you can get to them to swap out a cog or two. Also how nice they will play if you did find them. And if it is wear, how much longer will the rest of the cogs run smoothly.

John

Symox

I doubt it - someone would have to go through a lot of trouble to match the build quality

Symox

One thing I noticed is the marking on the two spacers is "11s" Can anyone with a Dura Ace 10 speed cassette verify what the marking is?

I tried putting the 105 10 speed spacers and didn't have any more luck.

The symptom by the way is I can get all shifts to go perfect except going from 3rd to 4th (13 tooth to 15 tooth). A wee bit more pressure on the shifter and it works fine.

Bigbus

Don't quote me, but 11s usually means 11speed in most instances.

Symox

I think it is much better now. I tried again putting the 105 10s spacers I had but this time without and additional shim between freewheel and cassette making sure when I tightened the lockring the fit was good. It works much better now.

I think a combination of the derailleur hanger and the wrong speed spacers may have been the issue.

Koyote

Just fyi: I would never buy a second-hand cassette. You will never know how many miles it has been ridden, nor whether it was cleaned occasionally, etc.

Symox

understood but I’ve had good luck with cassettes from people upgrading to 11sp systems

I probably never would have afforded a Dura Ace cassette if it weren’t for Craigslist and it definitely performs better than the 105 I had

ymmv

Koyote

I've used D/A, Ultegra, and 105 cassettes and found they perform the same. Only difference is weight. And a new cassette always performs better than one that is old and worn.

70sSanO

Good for you. Never thought of 10 speed cassette with 11 speed spacers, but that would mess up the shifting. Glad it worked out.

John

Symox

So I had used a 10speed cog spacer to convert the 11speed freewheel to 10speed as the supplied spacer wasn't enough for the Dura Ace for some reason. Well, it was made of plastic and it cracked. I swapped with the "11s" metal spacers that were inadvertently sent to me with the cassette. Shifting is the best its ever been now

Symox

I've found the DA cassette shifted faster and "crisper" than the 105. 105 had a delay and kind of "crunched" into gear. DA seems to have more of an immediate "ker plunk"