making up cassette

[bernieo]

i put together a ebike from bafang BBSHD kit . I had to remove 3 sprockets from cassette to get chainline right . after nearly 2k miles , i need to replace sprockets ,due to being worn.
my trouble is i can not find any shimano cassettes that will split or separate .
sunrace used to do 7 speed that came apart , no longer .
Does anybody know of supplier that sells separate sprockets or cassettes that can be disassembled . i need 12 16 21 28 teeth sprockets
i have been looking everywhere on the net.
thanks.

 

[Stefan Mikes]

What is the number of speeds (gears) in your cassette?

 

[PedalUma]

i put together a ebike from bafang BBSHD kit . I had to remove 3 sprockets from cassette to get chainline right . after nearly 2k miles , i need to replace sprockets ,due to being worn.
my trouble is i can not find any shimano cassettes that will split or separate .
sunrace used to do 7 speed that came apart , no longer .
Does anybody know of supplier that sells separate sprockets or cassettes that can be disassembled . i need 12 16 21 28 teeth sprockets
i have been looking everywhere on the net.
thanks.

For clarity do you require an inner side screw on freewheel cluster of gears, or a freehub cassette of gears with an external lock-ring? If this sound like gibberish, as it will to many, than simply look up these terms.

 

[bernieo]

bike originally had 7 speed rear cassette .
its the freehub cassette with the locking ring . i learnt the hard way ,by ordering wrong type .still gathering dust in garage . :-(
I'm surprised none of the sprocket makers are not doing custom cassettes ,built to order (except very high end).
their must be lots of bafang BBSHD owners having same problem .(chain line is a problem on that model)

 

[Stefan Mikes]

bike originally had 7 speed rear cassette .

Small Shimano cassettes are not serviceable because of their low price. You replace the whole cassette.

10, 11 and 12 speed ones are serviceable except for the top high end ones (which are milled from a single block of metal).

Besides, the cassette model number is usually printed on the back side of the largest sprocket.

 

[Chargeride]

The issue with a freehub is also if you space out, you end up with a high torque low gear sprocket that is sitting on the splines with a tiny contact area.
The larger ones are usually bolted to a spreader.
I took apart a huge dinner plate cassette I got 2nd hand off a friend, I used the spreaders as a spacer, bit of a botch, but it works.