A bike with ABS, regardless if it is front/rear or front only, is probably going to have wheel speed sensors front and back. From what I understand of ABS it isn't triggered by the speed of an individual wheel, it is triggered by a difference in speed between two wheels. In order to sense that difference you need a sensor on both wheels. The way to tell would be to find the ABS pulse module (typically made from a block of billet aluminum) and see where the brake lines coming out of it go.
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