Diamond company is not bad, as a brand. But the quality of tyres in brand new bikes whether servise, panther or diamond is crappy. Tyres are misaligned, rubber is of poor quality and you usually find it important to change the tyres even when they are hardly worn off.
Its too hot these days. If you keep 35psi, make sure you strictly ride alone. Because pillion ride will dramatically increase the risk of rear tyre puncture.
DO NOT change the rear shock absorbers of CG125. The stock ones are fine, and will do a far better job than any aftermarket shock absorbers.
The CG Dream's shock absorbers however are a perfect replacement. Because they are neither too soft, nor too hard. (Asked the mechanic yesterday, while i got my bike's push rods changed)
