Tabs tacked and shocks temp mounted. With no one on the chain just barely clears the swing arm, with my wife on theres a bit more and with me on I expect a couple more mm of clearance. This is running 18/52 and not properly tensioned, close enough to get about an inch and a half of slack though. Does that sound like enough headroom? I could shorten the mounts moving the bolt slot "down", probably would give me another mm or 2.

Sorry, 17/52. Was one sprocket being a prime number a plus as well or did I dream that?