Regarding your bike, all the 160s manufactured prior to the facelift come with tube type rims. If you want to shift to tubeless tyres, it is better to change to tubeless rims of 180s/new 160s.
Source - RTR 180 service manual. It states that if RTR180's tyres need to be used in 160s, entire wheel assembly set(rims and tyres) needs to be changed(applicable for 160s that come with tubetype tyres as stock).
OT Vibration is part and parcel of RTR, but you'll see the vibrations going down as you clock more km. If you have crossed 5000km, try using Shell AX7 in your next oil change. Vibes do come down a bit with that oil.
Regarding the RPM, 54-55 km/h in 5th gear is normal. You'll see deviation of 1-2 km/h depending on your tyre pressure. Make sure you have maintained proper tyre pressure (25 for front, 28/32 for rear depending on single/pillion).


Have others come across this problem?


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