Rotor size is measured by diameter, ie. edge to edge through the centre. The size may also be etched on to the rotor which would be more accurate than measuring yourself. There are a number of common IS (International Standard) sizes of rotor from 140mm through to 203mm.
How do I know my rotor size?
Call your local OEM dealer and ask for the original rotor sizes or OEM rotor/pads part numbers based on your vehicle’s VIN number (VIN# is referenced in your ownership papers). The dealership may not tell you the rotor size, but they will give you the genuine part numbers for your vehicle.
What size rotors do I need for road bike?
Generally, road and cyclocross use 140 to 160mm, XC mountain biking uses 160mm, trail riding uses 160 to 180mm (sometimes a mix, with the larger rotor up front), enduro uses 180mm, and DH uses 200 to 205mm.
Does the size of the rotor matter?
You can exchange brake pads, experimenting with different material compounds for feel and durability, but rotor size has a much more significant influence on absolute brake performance. … The more heat your brake rotors can absorb, the longer they’ll retain stopping power, without fading.
Where is the minimum rotor thickness?
The rotor’s minimum thickness tells you the minimum operational level of your rotor. This level can be found engraved on the sides of the rotor, within the veins of the rotor, or on the hat of the rotor.
Is 160mm rotor enough?
If you’re not one to count grams, stick with a larger rotor. They do a better job of displacing heat generated from braking, and can provide better modulation. … In general, a 180mm front and 160mm rear rotor will provide you with ample braking power for a 29er hardtail.
Do all brake pads fit all bikes?
Bike brake pads, on the whole, are universal; the main difference is the compound they are made of. Some have soft non-metallic compounds whereas others feature hard metallic compounds. There are also some variations in size and diameter of the pads but this doesn’t make much difference.
How do I choose disc rotors?
The bigger the rotor, the more braking power you get and better heat distribution, but also the greater the weight. Usually downhillers go for 205mm rotors on the front and 180 on the rear. For more calm disciplines like XC 160mm rotors are more common.
Why are my front rotors so big?
The front rotor is bigger because you CAN brake more with the front before losing traction. The rear rotor is smaller because a whole lot of extra braking force is just going to make the wheel lock up anyway, so a bigger rotor would just be a waste.
Are front rotors bigger than rear?
In order to stop your car/truck the brakes turn Kinetic Energy (Motion) into heat. The front brakes are larger than the rear because when you brake, the vehicles weight shifts towards the front. (the reason the nose ‘dives’) Causing the front brake discs to absorb more heat than the rear.
Are bigger rotors better?
Simply put a bigger rotor provided better braking, and a four pot caliper provides better braking – better meaning more, and more control (Everything else being equal). For the same force between the disc and pads, a bigger rotor generates more torque on the wheel – i.e. more stopping force.
How thick are brand new rotors?
SRAM rotors are usually 1.85mm thick to start with, although some of its 140mm rotors are 1.9mm, and they should be retired once they get down to 1.55mm. Different brands recommend different minimum thicknesses so check the details for the rotors you use.
How thick should my rotors be?
Measure the brake rotor thickness 0.40 inches (10mm) inside the outer circumference of the brake rotor every 45° ( 1 / 8 of a rotation). 6. Compare the smallest value measured to the minimum thickness specifications stamped on the brake rotor. If the rotor is below the minimum thickness, the rotor must be replaced.
How do you tell if your rotors are too thin?
When a rotor is too thin, it overheats and warps, leading to an annoying vibration or pedal pulsation. When rotors were thicker, they could take the wear from the brake pads, be machined and still have enough metal left to dissipate the heat.