Replacement back rim

[Halolll]

I have a 26” mountain bike 21 gears and I need to buy a replacement back alloy rim, the problem is I’m not real sure which type of rim I need and I want to buy a second hand one maybe on EBay if possible. I’ve been told there are two different types of rims. Any help to resolve this problem would be greatly appreciated.

[Johnny_Monkey]

Try the mountain bike forum.

[531Aussie]

I have a 26” mountain bike.......where are you?

There's a good 2nd hand shop in Melbourne (moorabbin)
Bicycle Recycle