Re: 1998 force 75elpt
Without any info its really a shot in the dark.
Prop size depends on the boat weight, design,and the typical load and activities.
If you have a prop you should get us the wot rpm and speed lightly loaded.
If you read the stickys at the top of the page and the helps on the prop store page
it will help you understand props better.
Without any info I think a 13 would be a good place to start.Don't worry about the diameter
if its for youre motor it will be right.