| | |  | 9 Speed | Home » » » » » SRAM PG950 Bicycle Cassette (9-Speed) | | | | | | | Description: | | Smooth, reliable shifting technology. This SRAM cassette combines PowerGlide II technology with a sturdy steel construction for dependable performance that really lasts. Sturdy steel body PowerGlide II design improves shifting performance and longevity Compatible with mountain and road 9-speed drivetrains | | | Features: | |
• Successfully reducing rotational weight over full steel cassettes
• The PG-990 accelerates faster, and saves energy for end-of-ride sprints to frosty recovery beverages
• Precision forged 7000 series aluminum lock ring
• Weighs 270 grams
• Blasted chrome plated sprocket finish
| | | Product Details: | | | Average Customer Rating:
|  based on 6 reviews |
| | | | Customer Reviews: | |
Average Customer Review:
 ( 6 customer reviews )
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Most Helpful Customer Reviews
3 of 3 found the following review helpful:
 This is a good budget 9-speed cassetteMay 08, 2012
By Raleighphile
"Have Raleigh, will travel"
The SRAM powerglide series of cassettes is a very good BUDGET cassette and can give you excellent shifting performance for the price provided you have a good chain in serviceable condition (not stretched) and a good derailleur that is not bent, is adjusted correctly, is mounted to a derailleur-hanger that is straight and true and with a set of high-quality shifters/brifters and cables/housings. All this stuff needs to be in good condition, clean, lubed, and adjusted properly. One fly in the ointment and shifting and even pedaling may be noticeably and negatively effected.
There are so many factors in problems with bicycle drivetrains that I have to read some of the less-favorable reviews for these and other similar cassettes with a grain of salt.
Skipping, bad/slow/missed shifts, noises, and other problems can come from many sources.
Often just replacing one part like this and expecting a magic bullet to fix all your ills is a bit short-sighted. If your old cassette was bad it's almost a certainty that the chain was bad too. Chains wear out faster than cassettes -but a worn out chain will grind away the favorite cogs of a cassette in short order. Replacing a worn out cassette and not replacing the chain will cause the problem to come back in short order. A worn-out cassette will also chew up a new chain in short order too!
It's a good idea, if you are not an experienced bicycle mechanic to review Sheldon Brown's excellent articles on bicycle drivetrains and derailleur adjustments. Do a websearch for "Sheldon Brown Derailleur Adjustment" and just keep reading that page and other linked pages on the Harris Cyclery Website until you have more of the big picture of what you are up against here with modern indexed-shifting systems.
If you are getting a cassette with a bigger largest cog for a lower low gear be aware that you may need to adjust your B-tension screw to keep the derailleur off of the cassette. This is a mistake a lot of people make and can cause serious damage to the chain, cassette and derailleur -even bend the derailleur hanger on the frame if it jams up and/or do serious damage to your wheel. Know what you are doing here please. Us bicycle mechanics really do not enjoy seeing people bring in mangled bikes and having to tell them that the cost to fix the mess will probably cost more than a new bike. Also, be aware that a larger biggest-cog may require you to run a longer chain or risk derailleur damage if the Large/Large cog/chainwheel combination is ever selected (not a good idea to cross-chain like this but still the chain should be able to do it should a mistake happen.)
In my opinion the only downside of this cassette (and any decent bargain cassette for that matter) is a small-medium weight penalty. More expensive units will weigh much less -and may shift slightly better, but not too much -the most important thing in indexed shifting is a high-quality cable and housing followed by a good high-quality indexed shifter lever/brifter. But don't forget proper adjustment of all the components being essential also for everything to work well together. The skill-set necessary to do this is beyond many home bicycle mechanics, at least for the first couple attempts until they learn the tricks.
The tools needed to remove this cassette are a cassette locking tool such as:Park Tool Cassette/Rotor Lockring Removal Tool - FR-5/FR-5G a wrench capable of holding the tool, and a chain whip like this: Park Tool HCW-16 Chain Whip/15mm Pedal Wrench. It's not a hard job to physically remove and re-install the cartridge. If your bike was working well when you swapped it should be fine with maybe a small adjustment of the cable to account for small manufacturing tolerances. If you put a bigger largest cog on you will need to adjust the B-tension screw for more clearance.
BEFORE ORDERING: Check your derailleur rating by searching for it here on amazon to be sure that it is rated for a larger cog than you have. Most Shimano medium-cage derailleurs are rated for 27-tooth max but you can usually get away with 28. 30 might be iffy. 30+ tooth largest cogs really need to have a mountain derailleur with a long cage and not a medium-cage (or small cage) road derailleur.
Sorry if this review seems super-long but there is a lot of material here to cover. Good luck with your new cassette, riding should be fun and there is nothing wrong with wanting your bike to shift well and be geared for your type of riding.
2 of 2 found the following review helpful:
pretty goodJul 18, 2011
By Rollie
Got about 2000 outdoor miles on my first one. Replaced it and have 12,000 miles on my second one. Though these are mostly spinning miles. I will buy again.
4 of 5 found the following review helpful:
SRAM PG-950 works wellAug 07, 2011
By gmyatko
I am finally retiring my 9 speed SRAM cassette. It is over 5 years old. It has over 12000 miles on it. I don't cross my chain big to big or small to small and keep the chain well lubed, and know how to shift without hammering the piss out of the drivetrain. I hear of chains and cassettes only lasting a couple of thousand miles. I have to laugh. I absolutely am buying another SRAM 9 speed cassette and chain. Oh, the only reason I'm retiring it is because my sonin law disassembled the cassette and one of the spacers disintegrated.
1 of 2 found the following review helpful:
Works wellJul 28, 2011
By wa
So far works well. Changed out my 53-34 to a compact shimano ultegra crank and this 11-28 cassette. I have ultegra group on my trek. This cassette is much heavier than my ultegra cassette but it has one higher and one lower teeth. The weight is worth it if you are losing it somewhere else. Like when I changed out my crankset I lost it there but gained on the back. The shifting so far is good. It's not a smooth but works.
Can't beat that price.
2 of 4 found the following review helpful:
 cheap productApr 22, 2011
By Iride Therefore Iam
"Still Greek to Me"
The 950 came as OE on my recumbent. I have about 900 miles on it. It has often skipped in the middle two cogs, even after adjustments on the barrel adj. Today when I took it off to place it on an new upgraded rear wheel, all the 9 cogs fell apart...and there was a small thin bolt/pin laying by them. "What the hell is this?" Well it goes thru the first 5 or so large cogs, and then screws into the 3rd smallest cog. However there is no way for the average cyclist to do this. It apparently requires a special tool. Looking @ the old wheel I could see where the loose bolt/pin had buggered up three of my spokes near the hub! So I guess it is good I'd decided to upgrade the wheel, as the old wheel with damaged spokes could have been a real probem on the road due to this cheaply made cassette.
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