At a price you can't go wrong with, the Shimano Alivio T4000 SGS Rear Derailleur makes a great replacement or upgrade for your mountain or commuter bike. This derailleur will work with 7, 8, or 9 speed Shimano cassettes and Shimano Rapid Fire shifters.
I bought this even though I could not find any reviews for this particular model online. I took a chance on it anyways, and was extremely pleased with what I received. Not sure how good this derailleur would work for mountain biking, I stick mainly to recreation shared paths (mostly gravel/stonedust) and more or less flat. For commutting or long trips, this is a sweet upgrade.
PROS: Attractive Design, Easy To Install, Solid, Durable
BEST USES: Upgrade, Casual Riding, Mountain Biking
This was a great affordable upgrade for me. I was having a hard time finding anything beyond entry level for a 7-speed back wheel. This Derailleur is compatible with 7, 8, or 9 speeds, so I am covered for a future back wheel upgrade.
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