I hope you are talking about CPC 2 & not MC5. The best method to reduce the noise is to have tread buttons of 'different sizes.' Easiest way to make a tyre less nosy is to make them asymmetrical. Size of treads immediately becomes different on other side of the tire now. Among two asymmetrical tyres, the tyre with more asymmetry would be less noisy. If in a room few people in are talking with each other in 'conversation' tone, it well might not be distracting for the person sitting & working on a computer outside the door. But if all the persons say same sentence in 'whispering' tone simultaneously, it will definitely attract attention of the outside person although we know the difference between noisy-ness of whisper & conversation tones. @KPR,I will respond to your queries ASAP. --- Double Post Merged, Sep 12, 2016, Original Post Date: Sep 12, 2016 --- Obviously, more raw materials needed & 16 inch & plus cars are considered as higher segment cars or premium cars as compared to the basic segment hence whatever concessions given to the basic segments are made up in upper segments. Better to stick to the stock size if 1) car is in warranty. 2) you are not sure if you can avoid potholes at good speeds. & if your driving style is spirited. For others, Those who have steel wheels, & need more driving pleasure or want additional sporty driving experience can go for 'inch up ' alloys rather than mere upsize. Those who have stock alloy, can go for upsize of the tyre only if they are not fully satisfied with the ride comfort of stock tyres. Xm2 michelin reviews are not good ( sidewall bulge & cuts) AFA bad roads are concerned. Comparatively PST have less complaints on this issue I bought Michelin PST just because my father who drives it on bad roads is a caring driver for the tyres, In the past, he has driven 2 sets of XM2 on wagon R without single complaint on same bad roads. Hence I know PST are going to be in safe hands. On highways, it's me, so no fear of sidewall or tread damage despite spirited driving style. For you, I need to know your driving style on bad roads. & also the size, load & speed index of the stock tyres. If I were you, I would have used stock alnacs (19kkm run, because there is still 13 to 16 kkm good quality life left in them) for Ladakh, as Alnacs (Non 4 G) have nylon in their tread which is marginally more bulge & cut resistant as compared to PST. Sidewalls of both michelin PST & Alnac are made up of same casing material (2 polyester) so not much difference.