None taken. Actually, they don't weigh much at all. They're made of elapor. The wire that holds them there probably weighs more.
It does need a tiny bit more up elevator trim with them on, compared to the 3" wheels I had on before though. Even so, it's a touch nose heavy at the moment, so I aim to lose some of that trim.
I need to do the legs more like this, or in that previous video: