So I'm buying new tyres, and I'm confused what will fit. The Honda CB400SF now comes stock with Bridgestone BT50 160/60-17 - Rear and 120/60-17 - Front.

I've been running Shinko SR741-740 150/70-17 110/70-17 for 4 years now. They fit well and run well.

I'd like to run something else this time around and I'm wondering what sizing I should pick up?