  Resonant production of excited $u$ and $d$ quarks at the Future Circular
Collider and Super proton-proton Collider have been researched. Dominant
jet-jet decay mode has been considered. It is shown that FCC and SppC have
great potential for discovery of excited $u$ ($d$) quark: up to 44.1 (36.3) and
58.4 (47.8) TeV masses, respectively. For degenerate case (M$_{u^{\star}}$ =
M$_{d^{\star}}$), these values are 45.9 and 60.9 TeV, respectively. This
discovery will also afford an opportunity to determine the compositeness scale
up to multi-PeV level.
