![]() If you’re looking for a bit of added power, consider going a size up however, you’ll likely need a mount-to-caliper-adapter to make up the space. The size of your new rotor will have a drastic impact on braking power. ![]() XC bikes will often have a 160mm rotor in the front trail and enduro bikes will jump up to 180mm and downhill bikes or e-MTBs will have a 200mm+ dinner plate. Rotors come in 140mm, 160mm 180mm and 203mm sizes, and depending on the category of bike you’re riding, it will be set up for a different-sized discs: the front rotor will usually be a size up from the rear. If you’re wrenching away at a disc for more than 10 minutes and it's showing no signs of improvement, it’s time for a new one. More often than not a few minutes with a truing tool will silence a disc that pings a brake pad as the wheel spins, but rotors can become deformed past the point of no return. Rotors are surprisingly fragile, and it doesn’t take much to knock one out of true – extreme heat from dragging your brakes all the way down a descent can also warp discs. Can a bent rotor be repaired or should it be replaced? If you don’t have a set of calipers to measure with, take a pick or a paperclip and run it along the rotor if the pick gets caught up on an edge at the bottom of the braking surface, it might be time for a new disc. If your rotors don’t specify a minimum, measure the thickness of the braking surface and compare it to an area the pads don’t touch if there is a difference of a 0.2mm – 0.3mm your rotor is worn and it’s time for a new one. Many discs will have a minimum thickness printed somewhere on the rotor you’ll need a set of calipers to measure how thick yours is. ![]() What to know when choosing the best mountain bike disc brake rotors How do you know you need new rotors?īeyond just an upgrade to something lighter or larger, rotors wear out over time. The rotors boast an anti-corrosion and heat treatment for more consistent braking, along with temperature management and dissipation to prevent warping. The Disc Wave rotor is laser-cut and double-disc ground from high carbon stainless steel for durability and to ensure either side of the disc is actually parallel. Galfer is well known in the powersports industry, providing OEM stock for quite a few motorcycle brands, and the Spanish outfit has also applied its stopping power expertise to MTBs. ![]()
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