the shimano cassette hubs i have dealt with the lockring was separate, i.e not the smallest cog. you can then slip spacers on and a chosen sprocket and that's that. have you tried removing it yet? you will soon find out. it is an easy job as long as you have the right tool
edit - as prav says - you can then use the original lockring
the shimano cassette hubs i have dealt with the lockring was separate, i.e not the smallest cog. you can then slip spacers on and a chosen sprocket and that's that. have you tried removing it yet? you will soon find out. it is an easy job as long as you have the right tool
edit - as prav says - you can then use the original lockring