This is a narrow tyre with low rolling resistance. It's my PB tyre. It fits standard sized wheels.
I have set PBs on it
Whether or not that is because I got fitter or because the tyre did help me eek out a few seconds of performance gain I will never know.
I bought a conti race tube to go with it. (Tube Conti Race 28 light)
Certainly didn't slow me down.
I had an schwalbe ultremo zx/r1 on the back.