Q. Will we be able to upgrade tyre size od Bajaj Dominar 250 to 110 in front and 140 or 150 at rear ?

You can definitely upgrade your tire size on dominar 250 but the riding dynamics of the bike changes a bit after doing so. Doesn't effect it that much but still, some degrees when Cornering or lean angle or 1 or 2 kmpl decrease in mileage. Bikes go through a good amount of R&D so the actual Tyre size of the D250 is more than good enough for a good riding experience. Some will say they decreased the tyre size cause of cost cutting but the engine is also less powerful as compared to D400. The bike is well balanced. There's no need for a bigger tyre but if one want, they can go for an upgrade.

I got my tyres upgraded to 140, masseter-X , best you can buy at 4k bucks. No issues, no mileage issue, go for an upgrade. It's been 2 months now since i upgraded.