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 Post subject: Q about Sachs PC91 chain
PostPosted: Sun Feb 17, 2013 1:48 am 
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I have a Question about the Sachs PC91 Chain, it is a hollow Pin chain 8 speed.

Trouble is, I have no Powerlinks.

Can I buy these powerlinks anywhere?
Do SRAM do them?
Can I buy them from say CRC?

Any links perhaps?

Cheers guys!

PS. I currently have a SRAM PC890 8 Speed Chain on the bike, would the Sachs PC91 be a worthwhile upgrade?


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PostPosted: Sun Feb 17, 2013 9:48 am 
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Sachs became part of SRAM. SRAM do pc91 chains. 9 in the 91 means 9 speed. Power links work on many chains and as Sachs=SRAM, I'd imagine they would work.


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PostPosted: Sun Feb 17, 2013 12:04 pm 
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Damn I have an 8 speed cassette. I thought the pc91 was 8 speed.


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PostPosted: Sun Feb 17, 2013 12:35 pm 
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Confusingly, the PC91 was in fact an 8-speed chain. You're right that in the present line up, the first digit signifies the number of gears, so the PC830 is a low end 8-speed chain and the PC991 is a high end 9-speed chain. SRAM have used this logical scheme for a good while now, but when the PC91 was the top-line SRAM chain about a decade ago the situation wasn't quite so clear! I suppose they inherited the confusion from their takeover of Sachs and sorted it out later.

The PC-91 will work fine with any SRAM 8-speed powerlink, but not with a 9-speed or 10-speed one. So the link you got with the PC890 will work fine. Any decent LBS should have decent quantities of 8-speed (silver), 9-speed (gold) and 10-speed (black) powerlinks. In my opinion the SRAM powerlink is the best solution on the market for quickly splitting and rejoining a chain. CRC has them all here:

http://www.chainreactioncycles.com/Mode ... odelID=871

As for whether the PC91 would be an upgrade over the PC890, well that's in large part dictated by the other components. As I said, the PC91 was the top-line 8-speed chain in its day, so provided it's not too badly worn then it should perform very well. The PC890 is a fine chain, but if it's brand new then it might not be tolerant of wear on the cassette or chainrings. The shifting might be a bit smoother on the 890, but I'd guess that the 91 is lighter, if that's important.

I guess the chain in question is the one I included with the XTR cassette - I don't think that it's excessively worn and it worked very well with the cassette. How it works with the chainrings remains to be seen. I cleaned it very vigorously a while back so would benefit from thorough lubrication. Perhaps soak it in a light lube bath to get it right into the rollers, and wipe all the excess off the exterior parts after.

Cheers,
Gareth.


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PostPosted: Sun Feb 17, 2013 12:57 pm 
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Thanks gareth. That should mean it'll work great with the power links from the other chain I mentioned?
My only concern was that the other chan and power links are of a slightly different shape to the Sachs chain. The power link would certainly look different from a distance and would most likely work a touch differently too.

Ill include some pics a bit later here to illustrate


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PostPosted: Sun Feb 17, 2013 1:32 pm 
King of the Skip Monkeys
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Psssst! 9spd chains work great on 7/8spd systems

Shhhhhhh!


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PostPosted: Sun Feb 17, 2013 2:54 pm 
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legrandefromage wrote:
Psssst! 9spd chains work great on 7/8spd systems

Shhhhhhh!



Ah!!


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PostPosted: Sun Feb 17, 2013 2:55 pm 
King of the Skip Monkeys
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Shhhhhhhh!


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PostPosted: Sun Feb 17, 2013 7:18 pm 
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legrandefromage wrote:
Psssst! 9spd chains work great on 7/8spd systems

Shhhhhhh!

They also cost $10-20 more for the same grade chain.


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PostPosted: Sun Feb 17, 2013 7:24 pm 
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Loki wrote:
legrandefromage wrote:
Psssst! 9spd chains work great on 7/8spd systems

Shhhhhhh!

They also cost $10-20 more for the same grade chain.


but it's handy to know that if you have a spare 9spd chain lying about it can be pressed into service on 7/8spd systems if required. Saves buying a new 7/8spd chain.


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