BOLANY Bike 8/9/10 Speed Cassette 11-25T/32T/36T/40T/42T/46T/50T Fit for MTB Bike, Road Bicycle, Lightweight Cassette, Compatible with Shimano SRAM Sunrace

This cassette (10 speed, 11-40t) is probably heavier than some of the higher end cassettes, but as far as quality I can't see anything wrong with it.It is machined well, it fit perfectly on the freehub body when installing.I only have one ride on it so far, but it shifted smooth. Time will tell as far as wear.One reviewer said that one of the three small screws that hold it together backed out. So before installing it I did remove them one at a time and put them back with thread locking compound. When removing them I noticed they were not very tight, so I installed them back a little tighter. In doing this the ends of the screws protruded through the outer cog a little. I simply filed them down flush. Honestly, they could probably be removed entirely, you would just have to deal with the loose stack of cogs and spacers when installing them.I didn't use the derailleur extension that came with it, because I don't like the design. It's off-set with a more extreme B screw stop position, not longer like a Wolf Tooth Goatlink.Although not optimal you can get by without an extension up 42T on a Shimano 1x10 speed system, so that's what I'm doing on two different bikes. I probably will be purchasing GoatLinks in the future though just to save wear on the components. (Note: Shimano 11 speed requires no extension at all on most derailleurs.)

Installed on my bike and works very well. Closer gearing is very handy when travelling on the bike trail near my home.

great value over the shimano 4100. perfect fit. will definitely buy again if needed.

Ah the 90's. Well, the late 90's when Shimano went hell bent on ramping up the race of how many cogs would fit on a rear wheel. "9?!" they cried. Well, it was also a time when riders thought a 25 tooth large cog was a "pie plate" (if I could only go back in time with an Eagle cassette). I have always had a spot in my heart for Shimano's 6500 Ultegra group, it was the best looking of the time and dead simple to set-up and use and it was durable. It's not as "finicky" as my 11 speed bikes (No 12 speed yet). Now that I'm a half century old and still riding in the mountains of Colorado, having a bike with an older 9 speed group on it makes it difficult to find proper cassettes to keep my cadence above 12 rpm going uphill. These cassettes are pretty simple, riveted cogs with a nice finish. No extra aluminum spiders or anything like that. I like the "matte" gray vs. a shiny, chrome finish. The description is "super light"...in truth, the weight is totally average and on par with the original Shimano cassettes (I don't recall, but I think mine was in the 270-280 gram range for an 11-28). Performance is completely acceptable for an inexpensive cassette. The finish is a a little rougher than a big brand and I think it's slightly noisier. Shifting performance is more than acceptable and I would say it would be hard to quantify a difference from the original cassette. Once you put a few miles on it, it seemed to quiet down a bit. I only dropped a star due to the "super light" mantra in the title description...this is not a weight-weenie, "super light" cassette. I would imagine these are sold under a variety of brands out of the same factory and that said, they are stamped, steel cogs. My guess would be the majority of them will be good to great quality, but there will be a higher percentage of flawed units out there. If you were to happen to get one, I would just exchange it as you'd have a high probability of getting a good unit in return. Hope this review is helpful and happy riding!

Did the job of going from 11-36 to 11-40 on my gravel bike with grx400, though I had to get a wolf tooth road link DM for smooth shifting to the largest cassette. I didn’t have to fiddle with any of the other shifter settings.

My fourth purchase with this product and like the performance, quality and duration of the cassette.

This review is for the cassette, not the extender. Upgraded my dated 3x9 setup to a 1x9 and needed a budget-friendly cassette. Bought the 11x42 version, installed with no problems, and I have been delighted with the smooth shifting. I've gone through lots of different cassettes (SRAM, Shimano, MIcroshift, etc.) and this one shifts as smoothly as most. I initially installed the included hanger extender but after attempting to bend it a little to make up for my crooked hanger, it snapped. Bought another (heavier duty) extender and now I'm enjoying the wide range of gears that are perfect for the local trails.

Purchased to upgrade to a wide range 1x setup Shimano drive train. No matter how much fiddling I do, I cannot get the mid-range to shift properly. Its almost as if the cog spacing in gears 6-8 is inconsistent. Will not make an up shift unless you make 2 shifts and then chain jumps 2 cogs. Frustrating because now I'm outside of the return window.Also after a couple of rides in damp conditions the black painted cogs as rusting pretty badly.I really wanted this to be usable for such a reasonable price, but sadly its not.UPDATE: After writing this review the seller has fully refunded the purchase price. Customer service is excellent from this seller.