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Replaced shimano chain with SRAM - shifting problems

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Replaced shimano chain with SRAM - shifting problems

Old 07-05-06, 01:59 PM
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fholt
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Replaced shimano chain with SRAM - shifting problems

I have a full 105 setup (9spd triple), and have just replaced the chain (which was the shimano 105 - hg73 if i recall correctly) with an sram 9speed (I think it's a PC-971) mainly cause I love the powerlink. I know that my old chain was not worn out yet, it actually measures very close to original spec, yet I now have a problem shifting.

Intermittently, I have trouble shifting between the 3 or 4 smallest cogs on the rear. I have tried adjusting the little barrel adjuster, but I can't get it dialed in - it lags or fails to shift both into larger and smaller cogs. When it happens, I normally just shift one further (it then properly jumps the 2) and then back one. It may be slightly more prevalent on shifting to the larger cogs, but definitely happens both ways. Since it seems to go both ways, I figured maybe not an adjustment, but perhaps a lubrication issue, so I put a drop of prolink on the pivot points of the RD - but to no avail. Should the chain actually be the difference? Should I go back to shimano and just use the powerlink with that - since I'm told it should be fine. SRAM cassette?

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Old 07-05-06, 02:02 PM
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You need to do a complete rear derailleur adjustment. parktool
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Old 07-05-06, 02:10 PM
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How old are the cables and cable housings? Replacing these is one of the better things you can do to improve shifting performance. You can test for this by detaching the cable from the rear derailleur and sliding the short housing up the cable exposing enough cable to get some lubricant on it. Then reassemble and adjust the barrel adjustor as needed. Be sure the Shifter is in the small cog position before re-attaching the cable. If shifting improves it's a good sign that the cables and cable housings need to be replaced. It's really a pretty easy job. The STI system seems to be more sensitive to excess friction in the cable housings.
Hosing out the shifters with WD40 can also make a general improvement to shifting performance.

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Old 07-06-06, 05:50 AM
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It's probably not the chain. I'd go for a cable and housing if they are more than a year or so old.
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Old 07-06-06, 06:10 AM
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I had a similar problem. I replaced the Shimano chain with the SRAM and had a SRAM casette (9 spd), everything worked fine. I then replaced the SRAM casette with a Ultegra casette (9 spd) and started having problems. The drive train was very noisy and I had trouble shifting. I went back to a Shimano chain and all my problems went away. I have heard that SRAM chains are slightly thicker than Shimano or Wipperman, I don;t know if that is a fact but I do know that the Shimano chain fixed my problems.
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Old 07-06-06, 03:17 PM
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Shimano and Sram are really not interchangable.

I do not know if that is the case with the chains, but it is with the other componentry.

If you try using a SRAM derailer with Shimano shifters or vise versa, you will never get it to shift right.
You are either going to have to live with shimano chains or you are going to have to replace all of your other components if that is the case.
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Old 07-06-06, 03:28 PM
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i had a sram cass with a shimano HG chain, and it got worn out "the cass", so i upgraded to a XT cass with a 971 sram chain (cant beat the powerlink), and its all back to new! but, i also changed out the rear derailer cable. thoose get gumed up really easy.

also, make sure you have the exact lenght of the chain as before.
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