Chain in tube now a days really doesn’t have any risk factor and is super easy to put together. We’ve done it for the past 3 years with 4" wheels + 16t sprocket, 5" wheels + 16t sprockets, and 6" wheels + 17t sprockets(dropped off lvl 2 every match for 8 events)—all with regular 25 chain—and have never once broken a chain on our practice or comp bot.