Nothing wrong with chain drive. Ever looked in a transfer case?When I was looking at the BRDM's, I read that some of the units had the belly wheels taken out in order to increase interior room. The way they sit, they are very intrusive in the space and get lowered to make ground contact. I understand they are also chain driven, so a part of me questions how durable the setup can be, when propelling a big beast offroad. On the other hand, the Russians had to make their gear conscript proof, so maybe the chains are super sized and don't break?