#7,621 in Sports & Outdoors
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Reddit mentions of Shimano Alivio 7/8-Speed Mountain Bicycle Rear Derailleur - RD-M410
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Reddit mentions: 1
We found 1 Reddit mentions of Shimano Alivio 7/8-Speed Mountain Bicycle Rear Derailleur - RD-M410. Here are the top ones.
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Cage Lengths: SGS-long, Capacity: 43T, Chain Wrap Capacity: 43teethDerailleur Action: Top-Normal (Traditional), Derailleur Color: black.SilverDrivetrain Spacing: Shimano/SRAM 8, Largest Cog: 34teeth, Min/Max: 11/34TShifter/Rear Derailleur : Shimano, Speeds: 7/8sp, Speeds: 8sp, Weight: 311g, Weight: 312g
Specs:
Depending on what you are looking to do to get back running you obviously need a new derailleur, you can pick up a 7 speed Shimano for relatively cheap (only Shimano, SRam/Campagnolo use different pull ratios and therefore wont work with your shifter) the exact one you have is in this link https://www.amazon.com/Shimano-8-Speed-Mountain-Bicycle-Derailleur/dp/B0064QKTW8
Looking at the shape of your derailleur and the amount of torque that thing saw there is a good chance you will need a new derailleur hanger from the looks of it you might be #13 http://derailleurhanger.com/specialized.htm Now, there is a chance the old hanger is fine, you could always throw the new derailleur on the bike first and see if everything is lined up (if the derailleur is not parallel with the gears you need a new hanger).
I would also look at putting in new cable and housing, you can pick that up pretty cheap, just make sure it's for shifting and not brakes.
When you look to hook all this stuff up do yourself a favor, watch a few youtube videos about adjusting your new derailleur, it's not that hard but a proper setup can make a huge difference, and it's best to have it dialed before you start skipping gears on your ride. New chain as you mention is a no brainier, make sure it's a 7 speed chain (other chains are different widths). When you get your new chain clean it with some simple green or other degreeser (while you have that degreeser out give that cassette a good cleaning) once you have it all good and clean rinse, rinse, rinse, don't leave any solvent on the chain or cassette, then use some chain lube (not WD40 or oil), depending on where you live you may want different lube (follow directions, some require quick wiping some don't).
Last piece of advice is take those brakes slow, those pads might be shot.
I think you're rolling a 2000 version of your bike the 2003 version was 8 speed but you can check the specs listed against what's on your bike and narrow it down.
http://www.bikepedia.com/QuickBike/BikeSpecs.aspx?Year=2000&Brand=Specialized&Model=Hardrock&Type=bike
Good luck, get rolling.