Join Date: Dec 2011
Location: Chico, CA
Bikes: 1984 Bianchi San Remo, On-One Inbred 456 Summer Season
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The Topeak Beam Rack attaches to your bike by clamping onto the seat post, and in my opinion are pretty worthless. I think your money would be better spent on a rack that attaches to your frame.
I just took a look at the pictures of a hardrock on the specialized website and it looks like your frame does have the holes drilled into the frame for attaching a rear rack. If you're not sure what I'm talking about, just take a look around the seat stays/seat post area of the frame and you should see a hole on each side of the frame for attaching a rear rack. As long as you get one that says it will fit 26" tires, then it should be fine. For the beam racks, you'll just have to slide the rack up and and down to get it to whatever height you want.