I have a 1993 vintage Specialized Rock Hopper. I rarely ride mountain bike anymore, but was thinking of getting a suspension fork for the bike. Thinking of using a popular internet auction website to find a fork. Seems there are some that may work for a reasonable price.

What should I look for? Do I want one that can be rebuilt? I'm mechanical in nature, just don't know a darn thing about mountain bike front forks.

What pitfalls can I expect with the fork?