So what? the Vitara aftermarket pistons can take a decent walloping and they are dirty cheap. Apart from those two statements there isn't much more to it.
Quite a careless splurt - there is more to it but pat yourself on the back if you think youve nailed it.
The vitara pistons I have measured in my possession tonight g16b and g16a have 28.5mm and 27.75mm comp height. The 27.5mm one was milled for my brothers 1.6 Sierra which threw a leg out after 210,000klms from severe overheating and trying to drive it home. After 1 year he got lazy by replacing expired coolant with water for another 5 years and kept overheating and refilling for months until it had enough.
Rings, comp height and pin size are:
1.2, 1.5 and 2.8mm , 28.5mm , 19mm
2mm, 2mm and 4mm , 32.5mm , 19mm
The Vitara OEM slugs on inspection seem weaker than the A12 due to ring sizes and crown design. The vits have very little support around the crown with 4 valve indents coming close to the top ring while the single E15 piston I have has 1.5mm, 1.5mm and 4 mm and nice decomp dish design. Anyone wanting to test the A12 vs g16b slugs is welcome to take them for postage price only for more accurate tests or analysis as they are junk remnants to me.