Yes, you can fit Pirelli M66 Route tyre on your current rim but I don't think it will offer much performance gain. Pirelli is definitely a better tyre than MRF but MRF 130/90-15 size tyre is adequete of Avenger. However, if you want to upsize for the looks then you can go ahead. With the Pirelli Circumference will increase by 5.9%, width and sidewall height by 15.4%. So, check it the pirelli tyre has enough clearance from the Motorcycle's hard parts. Also see- 5 tips for buying Motorcycle tyre.
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Just need some clarification on tyres... I have an Avenger 220 DTSI 2011 model and has completed 30k, Km... need to change the tyres. Saw some online. 130/90/15.... but Only MRF.. Can I use a 130/90/17 instead... or will I have to change the rim too. I m not perticular about mileage given by the bike.
Please revert back ASAP....
Offcourse you will have to change the rim. 17 inch tyres can only be installed on the 17 inch rim. However, I will not recommend you to use 17 inch tyres on the Avenger as it drastically alters the geometry of the motorcycle. Go for MRF Zapper tyres, they are decent tyres.