On straight road 10r is obviously Fast but on the corners R1 is Faster, R1 has Cross plane Engine which is why it sounds so god damn different form other typical inline 4 bikes(I love it).
TVS NTORQ 125 features 100/80-12 tyre at the front and 110/80-12 tyre at the rear. For the availability and prices of the spare parts, we'd suggest you to connect with the nearest authorized ...
Your motorcycle tyres and wheels are the only part of the bike that ever touch the tarmac ... and whether the size and weight will work for you. If you need to measure things like tyre pressures ...