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Thunderbikes is a generic term which refers to a class for aircooled single, twin and triple cylinder fourstroke  engined racing motorcycles.  Typical examples may be seen at:

http://www.youtube.com/watch?v=fbfcYf_aS4Y&feature=fvsr

 

These machines are raced in all MA historic periods, BEARS, and FX Pro Thunderbikes, in various capacity classes

 

                                                                  Thunderbike Links

ThunderbikeUK

http://www.thunderbike.org.uk/index.php

 

FX Pro-Thunder Eligibility Rules

http://www.formula-xtreme.com.au/xtremema.nsf/27d7a3a07f9eabf6ca256b7300249e6e/753359319ce52a73ca25767b00752d50?OpenDocument