Review on 🚲 Zsling Extra Long MTB Road Bike Rear Derailleur Hanger Extender | M10 Screws | Fits 34-52T Flywheel | Aluminum Frame | 11g | Black & Red by Mike Carter

I added an 11-40T cassette with a very wide gear range. The existing 15 year old front derailleur (Shimano Deore medium cage) couldn't reach the last two big gears. I added a Zsling and BINGO switch extension! Didn't need any adjustments but found I needed a longer chain. I always have a spare chain ($7) so I just used a new one. Indexing with the new cassette was perfect. Gear changes were as smooth as ever. Without this enhancement I would not have been able to make this change to this new cartridge. For the money this is a miracle. You can buy a more expensive extension cord, but I doubt you know better than me. 100% success.