Straight from Koya themselves, 19's will be around 18Kgs
+1! Finally some common sense
Jonzie26 = I take it from your join date you're relatively new here, now I have no idea about your technical knowledge on cars in general, but the comments made by other guys here about the weights of rims is merely coming from the experience and knowledge they have about the general weights of different sizes of wheels, knowledge they have probably picked up along the way by spending time on these forums and soaking up the wealth of information that can be had here if you look in the right places.
I used to have no clue about cars, now I have done a lot of DIY stuff like fitting my snorkel with fmic piping, making a second c.a.i aswell, repainting my worn interior trims, sevicing and maintaining it etc the list goes on, all thanks to skylines australia.
Don't worry if sometimes members here can come across as cynical, it's mostly in jest
goodluck with the wheels, you obviously chose them because they appealed to you which is the most important thing, making your car how you like it.
as said above if you ask someone's opinion on something don't always expect it to be favourable, you should see the r32/r33 camps go on about which car is better, silly if you ask me... r34s are miles in front .