Both, depends on which version it is.
Mine is originally with 16" front and 18" rear.
I believe they had 16" both front and rear when they came out and then they replaced the rear to a 18" later on.
Might have happened at the same time as they switched from short headstock to tall headstock, that happened around 85. I have/had a 85 with short headstock and a 85 with tall headstock. Don't know what wheels that was on the early version. Didn't come with stock wheels on it.
-Ulrik