Changing single tyre?

[gdgy]

Is it advisable to change just a single rear tyre of a front wheel driving car? (WagonR-MH55S)

Does the car need wheel balancing?

Should I refrain from putting this new tyre in the front during intervaled tyre rotations?

Car is a brand-new purchase and only driven 14,500km on old tyres. Thread difference between the new and the old rear tyres are around 1.5mm.

Thanks

gdgy

[HaeylM]

It would just be a waste of money cause you will eventually wear up the new tyre even more comparatively (the thread difference even minute, would cause the tyres to grip the road unevenly at average speeds and braking. 

Best option would be to replace as a pair always, its safer for you as the tyres would grip better and also wear less because of even contact. Dont get chinese ones like Hifly, go for Taiwanese or better.