TT Tyre Marking

TT

Tube-Type

Tyre must be used with an inner tube.

Standardised by ETRTO or TRA.

Where TT is on the tyre

Lettered markings read as the tail of the size string, moulded right after the speed symbol. Here it is on an example tyre.

TT Tube-Type

Tyre must be used with an inner tube.

TyreCalculator — Tyre Size Calculator & Comparison Enter a tyre size such as 265/65R17 to see its section width, profile, sidewall height, rim diameter, overall diameter, circumference and revolutions per kilometre. Add a second size to compare the two and check whether the swap fits, including the diameter difference, speedometer error and ground-clearance change. This tool needs JavaScript enabled.