The chain transition to the wider bite occur up at the 360 range,
It's a Stihl. When you buy it, you can spec what bar and chain you want. You don't have to take one set up off the shelf, the way the counter-jockeys like 'em....
I bought a 260 pro and the dealer stripped off the .325 safety chain, sprocket and 18" bar, and added the 20" inch bar and 3/8th pitch full chisel chain I wanted.....
