Disc Brakes

revcore

Squid
Please forgive me if this seems like a silly question, I'm relatively new to disc brakes.
On my Revell Clutch 24 Dirt Jumper it currently has a 160mm disc and the rear wheel is all the way forward in the dropouts. Was wondering if I would require a larger disc if I were to run the wheel mid way in the dropouts or would the 160mm still be okay?
 
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