Speed symbol — max sustained speed60 km/h / 37 mph
At its rated load.
Nearby speed symbols
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Defined in UN vehicle regulation.
On a sidewall this can also mean
sidewall marking — Commercial / Van Reinforced casing for light commercial vehicles. A C-type carries a higher load at a higher inflation pressure than the passenger tyre of the same size — the two are not interchangeable.
load range C — 6-ply rating Equivalent to a 6-ply cross-ply, not built from 6 plies. Light truck and van — the first LT step, and the same letter as the European C-type marking without being the same thing.
Where the C speed symbol is on the tyre
It is the single letter at the end, right after the load index. Here it is on an example 205/55R16 tyre.