Also a word of caution, 22" is 55.88 cm and LH group allows 55cm maximum. The problem is their sizers are probably 50-52cm at best (I can't fit my 55cm in there when it's empty). Gate agents know about this but usually say "sorry you're right but I enforce rules I don't set them". YMMV...
Having been scammed by this years ago, I keep a very small tape measure in my bag, it cost me about €1 and it has saved me ever being scammed again!