low
輊 centers on being physically low, especially in the context of a vehicle or carriage that is low-slung or pressed down.
輊 combines 車 (vehicle) with 至, which likely contributes the sound and the idea of arriving or pressing down, giving the sense of a low carriage.
A vehicle (車) that has arrived (至) and is sitting low on its wheels: 輊 means low.
For チ, imagine a low car that is so cheap it barely runs: cheap -> チ, and the car is low to the ground.