NEW FOR 2008 - EBC XC Series - Contour Rotor Blade Fully Floating Street And Race Hybrid Front Brake Discs / Rotors
Ultra lightweight new EBC XC series, with contoured rotor blade profile, floating front discs for sportbikes and road racers are now available, this range replaces the original ’Contour’ range.
The steel used in the new EBC rotor blades is also a special stainless blend with higher friction effect than normal heat treated stainless steel found on stock discs and boasts up to 10% improvement in friction effect improving brakes even further.
Weight of the new XC series is then reduced by another 5-10% by using a 6 only button SD (Square Drive) system on a lightweight alloy centre hub, which once again grabs the lead over stock parts. OE discs cannot be switched to the lighter 6 button system on alloy hubs because they are still stuck in a rut using circular rivets. Circular rivets demand more contact points to get the same geometric centralisation and still avoid generating slack in the drive direction because, being circles inside circles they only offer point contact.
The SD system employs LINE contact and as such rotor blades are much more positively retained about the centre hub and never go slack in the drive direction even after abuse. The new rotors feature EBC’s unique and patented S-Drive button system which features square sided rivets captured in square drive pockets on the rotor and hub which allow the outer rotor blade to expand and contract freely under the heat of braking without suffering rivet lock.
Rivet lock is the term used when rotors heat up under heavy braking and the rotor blade contacts the (normally circular) rivets that separate the inner rotor hub and the outer rotor blade. The new EBC system completely eliminates this problem area which causes 100% of the failures of rotors suffering from distortion and brake vibration.
| The theory behind SD-System (Square Drive) |
- Under the heat of braking a rotor blade expands or shrinks in both its diameter and band width causing the inside of the rotor blade to shrink radially inwards towards the hub. With circular buttons, as the rotor shrinks, it will contact the inner button and cause the rotor to tighten and either be distorted sideways causing either brake pulsation or spongy brakes.
- The SD-System of square sided buttons means that the rotor can expand inwards and outwards unrestrained and that perfect rotor functionality is retained at any speed or load. Not only does this extend the lifetime of the rotor and prevent distortion failures, it keeps the rotor blades perfectly true and flat throughout their life cycle and technically the only reason for a rotor to need replacement will be impact damage or over a VERY EXTENDED number of miles possible rotor wear limits being exceeded. This means that a rotor equipped with the EBC Brakes SD-System could last 5-10 times as long as a conventional rotor built with circular buttons.
- A further advantage of the SD-System is that the drive forces under braking are transmitted over a LINE CONTACT on the square side of the button compared to the point contact of a circular button. Extended use with a circular button and its point contact will mean that the rotor could shake loose over a period of time in the drive direction. Slackness of the rotor blade relative to the inner hub is a major negative and can cause rotor “throw-out” and lead to severe vibrations at speed. The SD-System maintains close tolerances of the rotor in the drive direction over a far longer period thereby extending rotor life.
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- All EBC XC Series Brake Discs / rotors are equipped with the NEW EBC PATENTED SD SYSTEM
PRICE PER DISC - if you need a pair of front discs please change the quantity below to 2
