Comet Tribal Black Harley Davidson Brake Disc HD1502BK. COMET Brakes provide exceptional quality Floating and Solid Brake Discs which offer incredible performance for the price. 1x HD1502BK Black Tribal Design Brake Disc. Colour: Black (Tribal Design). Inside Bore : 56.4mm. Hole Diameter : 8.5mm. You can send us a message by using the “Questions and answers” section towards the bottom of the page.