FOMTOR 11T Rear Derailleur Jockey Wheels Aluminum Bike Derailleur Wheels Pulley Suitable for Most Shimano Sram Rear Derailleurs (Black, 2 pcs)

I bought this to replace the sticky jockey wheels on my Shimano Ultegra 10 speed. One wheel spun nicely and the other spun ok (better than the Shimano wheels), but the size and teeth spacing didn't work with my Shimano 10 speed chain so I'm returning it. Hub was the same color as the wheel also but that didn't matter to me.

Diameter (and so the circumference) for these is larger (vs OEM Shimano 11-T jockey wheels) but these still have 11 teeth. Thus the space between teeth is too big - so the result is clicking, jamming, and bad shifts.Shimano top and bottom jockey wheels work SLIGHTLY differently and make be slightly different. (NB - the jockey wheel axles most often are also different and are not interchangeable.) These two wheels are identical, so they will not have the proper Shimano-by-design tiny amount of extra side-to-side play in the top pulley that makes for much better shifting. Also these wheels are slightly 'thicker' (at the hubs) than Shimano wheels, which would make the no side-to-side play issue even worse.Thus, they do not perform as stated - not a good replacement.

My original Jockey wheels were wearing badly and these are a perfect replacement. They look better, fit better, and were cheaper than oem replacement.

Product came out of the bag looking great the anodizing is on point but after installing them on my bike the teeth did not line up with the chain. It made a clicking noise and would try to throw the chain. I had to reinstall the old worn ones. Pretty disappointed.

it work great it

Shaft adapters would have been nice...