they have a 48" chair swings, which is normally 42" at most parks.
The chair swings are actually 40" but anyone around that height has to sit on an inside seat and wear a seatbelt. 48" is the height requirement to ride alone.
That being said, I fully support BGW lowering Verbolten's height limit, especially when the park already not only has two major rides with a 48" height requirement, but 48" being the height requirement to ride alone on many of the other rides. Maybe adding seat belts will help lower the height limit (although I personally don't think seatbelts are really necessary on a ride like Verbolten when rides like Scorpion don't need them).