Shimano Deore M5100 rear derailleur, 11-speed, Shadow+, SGS long cage,Black

Son managed to trash his existing one over some rather horrible curbs on his paperround. This set fitted perfectly on his bike and the build quality is brill. Works perfectlyl with his cassette already on the bike.Installation was easy, but it did require some care remembering which order to put things back together and how the chain goes on, but this is more cycle maintenance, rather than product related.It has now been on his bike for 10months with no issues, both to school, paper round and off roading at the weekend. Great replacement

I recently upgraded my mountain bike's drivetrain to the Shimano Deore M5100 rear derailleur, and I am absolutely thrilled with its performance. My new bike came with SRAM SX, which was, quite frankly, horrendous, and I have always hated their shifter ergonomics. This improvement is genuinely remarkable. Paired with an SLX 11-speed shifter and a Shimano chain, the shifting performance is top-tier. The clutch is a must-have for any serious off-roading, and this one works as well as any other. The aesthetics of this derailleur look very classy. As far as I am concerned, you just can't beat Shimano's mid-tier mountain bike components

Very long derailleur perfect for large cogs.gear selection is quick and smooth.

Just arrived and it looks a bargain going to put it's on now 🙏🤗 Guys Ile ring if I need more parts explained. Now I've seen how fast too, quality

Fitted because my old derailleur wore out and I wanted this item so I could fit a cassette with a larger low cog (11-51). It works fine with my 10 speed drivetrain and SL-M4100 shifter. A good upgrade.

Bad seller bad component you've been warned

Price was decent, andd amid all the rumours of fake copies I cannot see any difference between this and an older one bought from a well established bike shop. Great delivery times and in original Shimano packaging. Excellent.

I bought this to replace an XT that broke after 7 years of heavy MTB use. I am very pleased with its performance, gear changing is smooth and fast with a Shimano XT M8000 11 Speed I-Spec B Shifter. It also seems to be a more robust piece of kit.Being able to move two gears up on a single push makes a big difference. The larger 13 tooth cogs also seem to help and hopefully will last longer than the usual 11t that wears out quickly.If you have a problem with the chain coming off the bottom gear when changing check to see if the derailleur hanger is loose and apply some thread lock. On that subject, depending on which hanger you have on your bike you may still need a Rear Derailleur Mech Hanger Extender Drop Out Extension to fit it.As I use a 30t front chainring I only need an 11-42 cassette on the rear and this derailleur is nowhere near its full capacity. I also only need a 114-link chain. Highly recommended.