Just changed two bikes from 7 sp. freewheels. For those interested the Sram cassettes & new hubs saved more than half a pound from each of my 7 sp. setups. I am hoping for less maintenance and wear at least equal to that of freewheels. My rear derailleur is a 10 sp. Campy Centaur and works fine with an 8 sp. Sram chain & DT controls. Sram cassettes are light & provide smooth shifting. An economical and well designed product.
My oldest road bike is my 21 year old workhorse. For the past ten years, the SRAM PG-850 cassette has been my 1 choice when it's time to replace a worn cassette, durable, consistently dependable, great price. Also works just as well on my older mountain bike!
After breaking a ring on my factory cluster, I purchased this as a replacement. It's shimano compatible, and affordable. Works perfectly, though the ratios may be a bit aggressive for some commuters (it's on my commuter). I purchased it online, WBW installed it for free onsite when I went in to pick up the part the same day.
Great price. But the steps between gears isn't very useful, in my opinion. I prefer a more linear spacing, with less space between the big gears (think Shimano's classic 11-34 tooth 9-speed cassette). Still, for the price, this does the job.
For those of us able to live without the bleeding edge of drivetrain technology, this is a very affordable, decent quality, reasonably lightweight replacement cassette. I've used this model, along with the PC-830 chain, to keep several of my older bikes running, and have no complaints.