Same as above on my Plunger, have a 4.00 on a WM3 with ~3/8" clearance from the chain which I imagine would be same for S/A(being fundamentally same box, different mounting). I have about 8mm clearance from the aftermarket chainguard which I think I fitted in a rush so I could go for a safety and the original was causing grief- will address that next time wheel is off (oh yeah!)