Hi RSchragis, Asama is quite popular in Vietnam but just for very amateur users, and very difficult to find a L or XL size. If you have any question about bikes or need any support from bikers in Vietnam you can come to
www.xedap.org and come to the "tư vấn - hỏi đáp" (mean question and advice) room. you can post in English, sure someone will help you.