What size are rotor bolts?
m5*10mm is fairly usual for rotor bolts.
Are brake rotor bolts necessary?
You don’t need them, but with the wheel off and no bolts going through them, the rotor will rotate freely around the hub. The result is that this rotation sometimes makes you spend an extra bit of time lining the bolt holes up between the hub, rotor, and wheel.
What is the torque for rotor bolts?

Like most other fasteners used on your bike, rotor bolts have a recommended torque. SRAM/Avid states that its rotors should be tightened to 6.2nm (55 in lb), while Shimano recommends 2-4nm (18 – 35 in lb) for its rotors.
How long do Harley rotors last?
between 30,000 and 70,000 miles
Harley rotors are expected to last between 30,000 and 70,000 miles. Aggressive riding can cause Harley rotors to wear prematurely. If brakes are applied hard and often, like during aggressive stints at racing speeds, the friction generates excessive heat, causing rotor wear.
Are all bike rotors the same size?

Bigger brakes can blunt lever feel Mountain bike brake rotors are generally sized from 140- to 203mm. Most mid-travel bikes have a 160mm at the rear and 180mm up front.
What size are Shimano rotor bolts?
On the approximately 5 different models of Shimano disc brakes I’ve dealt with over the years, the caliper fixing bolts are M6 x 18.7mm, and they are socket head cap screws in non- bicycle parlance. This length of fixing bolt would be if you were using 160mm rotors in a post mount set-up.
Are brake rotor screws Universal?
If you look at how the whole assembly of hub/studs, rotor, wheel, and lug nuts fit together, you will see that these screws serve no purpose once the wheel is installed. The screws exist merely as an unnecessary assembly aide.
Is 60000 miles alot for a Harley-Davidson?
For small sports bikes, 20,000 to 30,000 is on the high side. For larger bikes, 50,000 miles and up is considered high motorcycle mileage.