tyre came off rim

Last week whilst doing a spot of xc, and on the way down a steep hill my tyre came off the rim. Was this due to the tyre spinning on the rim as i braked? To note my rear disc pads worn out also on the way down and my front disc took the brunt of things.
Tyre 2.1 panaracer fire xc pro(folding)
wheel 717xc mavic
Lx deore brakes(hydro)
regards
http://www.pinkbike.com/photo/1347023/
KEEPING IT REAL RIDING STEEL
Tyre 2.1 panaracer fire xc pro(folding)
wheel 717xc mavic
Lx deore brakes(hydro)
regards
http://www.pinkbike.com/photo/1347023/
KEEPING IT REAL RIDING STEEL
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nick
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The only other thing I can think is when rim tape starts to get old it can shift the tyres about in my experiance.
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