What does TT & TL meaning?
TT means tube type, TL menas tubeless.
The meaning of motorcycle tire and inner tube size indication
There are many symbols on a motorcycle tires. usually including: size,brand,tire type(TT/TL),ply rating,load capacity,speed symbols,rotation,the certification ID(such as DOT,ISO,ECE,etc),TWI,sometimes, also have the manufacture’s mold ID.