More out of curiosity than anything else, here is what I found: Read and be as ??? as I.
According to the .pdf from EBC, the FA stands for Street, and the X stands for Off Road.
FA106 - $19.95 - Kevlar Organic
http://www.ebcbrakes.com/mcstreetpads.htmlFA106X - $20.95 - Carbon Graphite
http://www.ebcbrakes.com/mcoffroadpads.htmlPrices from here:
http://www.mawonline.com/ebc.htmAnd they have a slightly different take on what the useage is:
FA106:
EBC Standard Brake Pads
EBC Carbon Graphite Pads are blended with Kevlar fiber and Graphite particles impregnated with bronzed Graphite powder to enhance lifetime. The Carbon Graphite construction ensures a cool operation of the disc pad, reducing heat transfer to the brake caliper and system hydraulics. These pads have been the choice of World Champion Motorcross riders for many years. Excellent brakes for faster motorcross and enduro racing.
FA106X:
EBC Carbon "X" Brake Pads
Carbon graphite "X" pads for leisure/sport use. Lowest price point EBC pad. Lowest heat generation. Best for fast dry riding, not for mud, wet or sand.
More than too much info for me. My bike stops nicely.