1 - Putting alloy wheels is a bad Choice it will not only reduces Bikes performance but also reduces the engine life over all.
2 - They Grey Bike pic you shared brother if you notice has a different Bigger engine and produces double the power of stock 125 and double the accelration and thats why it manages such huge tyres.
@rajaxone Congrats for a beautiful machine, its one of the best machines you can find for Relaxation in northern area, but please notice you can go there on bike untill May next year as its too cold for a bike ride now and the roads are already started to Clogg by snow and soon will be closed.
Untill then learn to Ride specially go to Damen e Koh, Neela bhotu, neela sandh and near areas or Muree on it to get some hands on experience with it.
I would Advice to Ride alone when going to steep hills to avoid any problem in start.
go through different tourist thread and see how the manage there huge lugauge on small bikes... Its a fun job to do little maintainces your self as well and helps to fix little issues on tour as well.
But again please do remember its a China bike and can have stupid/lame issue which one do not expect very often, also you mioght notice it getting over heated in start break in period.
If you dont find good RP125 mechnic in RWP/ISL then alway get it tuned from propfessional CG mechnic who know pushrod engines well enough, dont follow 'Free Mashwaras' from Hathora mechnics they dont know a bit about this machine..
Allah apko is per Full time Enjoy kerna naseeb keray! (Y) take care.