Hey folks, I picked up an unused replacement 7-speed cassette a while back, and while the lockring had the Shimano logo on it, all the cogs are marked "AJ AM" instead. Is AJ AM a subcontractor for Shimano, or did I get a knockoff cassette that should not have been sold as a "Shimano"? I'm more curious than worried about it, but "AJ AM" doesn't play well with most search engines.

Thanks!
- Scott

IF it's either an 11-28 or 11-30, it's the Shimano code for those cassettes.

The 6 smallest cogs are the same, with the AJ being 28 teeth.

Yeah, it's an 11-28T. That's cool!

- Scott

Just did a little more digging on this particular cassette. Apparently, it's the "Interactive Glide" that was Shimano's attempt to improve on HG. The gearing (11-13-15-18-21-24-28) matches with the "AC" set in Sheldon Brown's gear calculator, so I'm curious if they used the "AJ AM" code to keep it from being confused with a HG cassette.

Additionally, I may need to do some grinding or add spacers to use this cassette on my bike -- anything else I may need to watch out for? Since this cassette would raise my top-end gearing (currently using a 12-28T), I wonder if I'll like the change.

Thanks,
- Scott

Are you having trouble with the 11 tooth cog?

https://sheldonbrown.com/k7.html#hyperdrivec

Maybe you could just use your 12T cog instead of the 11???

Well, I was idly curious about what I might have to do when this old 12-28T cassette finally wears out, but I went ahead and test-installed it -- fits on my RX100 hub just fine.

Thanks!
- Scott

IF you decide you prefer the 12T instead of the 11, swap it.
Most the time, my cassettes (9 speed) are pieces of 2 or 3 cassettes to get the combo's I like.
Ironically, on one of them, I ended up with a 12-21 , which is a standard combination.
If I had your 2 cassette, I'd probably end up-
12-13-14-15-16-18-21. (I've got small rings)