Regarding Apache RTR 180 ABS 2012 Model

Hi, My name is ganesh and I am having a TVS Apache RTR 180 ABS, recently I changed my back tyre and the MRF seller has changed 100/90 17" and he is saying that this is the specified tyre for Apache, but specification says 110/80 17" so can you clarify what is the correct tyre for my bike

Best Features: Good pick up engine

Pros: I like bike pick, very quick responsive

Cons: Vibrations