Q. Why Bajaj Dominar 250 has 130 rear tyre. What's advantage and disadvantage of this. What if change that to 140.

Bajaj Dominar 400 has never been marketed as a corner carver. It’s more of a straight line tourer. The 250 can be considered a little better in that regard, as the slimmer tyres -- 100/80x17 at the front and 130/70x17 at the rear -- make it a little lighter on its feet. Although these tyres won’t give you the same confidence once leaned over into turns as the 400’s radials, the 250 does turn in easier, which makes it lighter to steer into corners. This lightness is apparent at city speeds and even when you move the bike around in the parking lot. Moreover, you may have broader tyres installed in the Dominar 250, however, you may lose on the performance and fuel efficiency while getting better handling.

Its an advantage to get good mileage as 35 of you update the 140 you can get good road gripe then 130 and some mileage of 30 to 33