While MRF Zapper Q is a pretty good tyre and you can go ahead with it, yet I would suggest that you buy it in stock size. This is because we do not recommend upsizing in case of 2 wheelers as it hampers the riding and handling characteristics of the vehicle. Only Bajaj people could tell you if you should upsize or not.
Other options would be MRF Zapper FY1 for the front and MRF Zapper Y for rear.
ishan sharmavia Google
What tyre would you recommend for yamaha fz_s rear tyre amogs these with reason:-
Ceat zoom xl
Michelin pilot sport
You should go for Michelin Pilot Sporty or MRF Zapper Q. They both are pretty good and offer good traction and make for confident cornering. However, out of these MRF has longer tyre life as compared to Michelin.