I am also surprised that the dealer told you that upsizing will hamper the suspension. The 140/70 R17 rear should be a perfect fit on the RTRs and will not have any negative effects whatsoever. The Bajaj 200NS has the exact same stock tire as our RTRs. But most owners I know have upgraded to a 140 section from either Ceat (Zoom XL) or Michelin PSRs and have seen grip levels and stability improve noticeably.
I would really suggest some more research as a single step increase in the rear tyre size would have no negative effects for sure. And IMHO, a 200cc motorcycle should have a 140 stock in any case. Bajaj and TVS are the only companies that are somehow not providing them on their street fighters.


..Mrf Masseter..[emoji41] 

..front regular zapper..90/90

[/B]

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