I have an old KHS Team ST frame that I just threw components on about 15 years ago. the drive train is SRAM esp 9.0 shifters and rear derailleur with a shimano HG cassette. I have never been able to shift into the smallest cog. I wonder if this frame (most likely 1999 or 2000) is compatible with a 9 speed drivetrain or if I am just absolutely horrible at bicycle maintenance. I am also no longer certain that my chain is a 9 speed chain, but it probably needs to be replaced so I will be doing that anyway.
What are some things I can look at to fix this problem.