PG 990 versus PG 980- Mtbr.com
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  1. #1
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    PG 990 versus PG 980

    What exactly does one get with SRAM's PG 990 cassette that doesn't come with the PG 980? I'm looking at the following two items, both 2010 models:

    Sram PG 990 9 Speed Cassette '10 at JensonUSA.com

    Sram PG 980 9 Speed Cassette '10 at JensonUSA.com

    Weight wise, they are virtually identical. Jenson lists the 990 at 305 grams for the 11-34 model, and the 980 at 304 grams for the 11-34 model. The cheaper unit is a gram less. Given that the weights are the same, why would I want to pay more and buy the 990? There must be some advantage to the 990 over the 980, and I'm just not seeing it. What is it?

  2. #2
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    The 990 11-34 has the six largest cogs on an aluminum spider and the the 980 only has the three largest on a spider. It's surprising the weight difference isn't bigger, but I've seen it confirmed before. If you have an aluminum freehub then you definitely want the 990. The three cogs that aren't on the spider on the 980 are still large enough to dig in to the freehub.

  3. #3
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    The 990 comes in pretty colors.
    "Don't buy upgrades; ride up grades." -Eddy Merckx

  4. #4
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    Quote Originally Posted by boomn View Post
    The 990 11-34 has the six largest cogs on an aluminum spider and the the 980 only has the three largest on a spider. It's surprising the weight difference isn't bigger, but I've seen it confirmed before. If you have an aluminum freehub then you definitely want the 990. The three cogs that aren't on the spider on the 980 are still large enough to dig in to the freehub.
    Thanks! That explanation helps a lot. It probably saves me money too. I'm going to doublecheck, but I'm pretty sure that my son's hub is steel.

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