Tascam 22-2 non standard pulley

I had a Tascam 22-2 in and noticed that this pulley was somewhat larger than normal , I am not sure if it was just designed like that, perhaps the motor was moved closer to the Capstan wheel or maybe its for an export version although when I looked it was a UK mains plug and wired for 240volts, I have not seen another machine opened so cannot say it was standard, I am guessing the same maybe said about the 22-4

i have now seen 3 pulley sizes on this machine

47.8mm wide 1.885"