This article is from the RSC/UKSC Cricket FAQ, by Ganesh with numerous contributions by others.
There is no "official" speed scale used for
the classification. But ...
Donald Rose:
These are some rough guides.
EXPRESS above 152 kph (91 mph) FAST 145 - 152 kph (87 - 91 mph) FAST MEDIUM 133 - 145 kph (80 - 87 mph) MEDIUM FAST 120 - 133 kph (72 - 87 mph) MEDIUM 90 - 120 kph (54 - 72 mph) SLOW below 90 kph (54 mph)
Superfast - 145+kmh eg Shoaib, Brett Lee Fast - 135+ eg Donald, Wasim,Waqar Fast-Medium - 130+ eg Mcgrath, Pollock
 
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