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over researcher
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Discussion Starter · #1 ·
It's time to finally upgrade the drivetrain. Current setup is Shimano M951 shifters, M950 12-32 cassette (top 3 are Ti), M952 rear derailleur, and M960 (or whatever it was in 2006) front derailleur. My cassette is completely hammered, with the teeth literally getting wider where the chain makes contact due to the peening of the teeth. Despite this, it actually shifts quite well. There is no gear skipping, or hanging up, or any major issues for that matter. This is why it makes it so difficult to justify the upgrade.


I've been happy with Shimano, but I think I'd like to see what the 1:1 SRAM fuss is all about. I also like the idea of getting rid of the rear derailleur cable loop. I realize the Shimano Shadow rear derailleur would resolve that problem, but I've heard the SRAM is good stuff and I've read about a few issues in my limited reading about the Shadow. I'm also wondering if I should use a SRAM PG-990 cassette, or if I should continue with Shimano and use an XT M770. Which seems to shift better? Which has more cogs on the spider? The 11-32 cassettes are even in spread, but the XT 11-34 spread is more even than the 990 11-34 spread.
XT 11-32: 11-12-14-16-18-21-24-28-32
PG-990 11-32: 11-12-14-16-18-21-24-28-32
XT 11-34: 11-13-15-17-20-23-26-30-34
PG-990 11-34: 11-13-15-17-21-23-26-30-34

I'll just stick with my RaceFace 94/58 5-arm Turbine LP cranks, and I'll just pick up some new RF 22-32-44 9sp chainrings. Regarding chains. PC-991, PC-991 Hollow Pin, or PC-991 Cross Step? As a reference, I've been plenty happy with the PC-68. I'll also keep my current front derailleur.


Anyway, thanks for the advice.
 

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Saving lives with knives.
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I have limited experience with the Sram cogs, what I can tell you is that they are heavier and more expensive than the Shimano XT which I think is the standard for high performance riding. If you want to go sram get the X.9 shifters with the XO RD (X.9 will wrk fine too in the rear) with your triple up front, I would get the 11-32 (the gear you have with 22-34 is just about useless unless you're running a 29'er) XT cassette and a shimano chain and throw in a powerlink--drivetrain bliss right there!
 
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