According to Official Guinness Records,
The record for the largest parade of BSA motorcycles is 218 and was achieved by the BSA Owners Club UK in Laxey Village, Isle of Man, UK, on 18 August 2008. The record was achieved during the 50th BSA Owners Rally.
For a complete list of 2008 records, please visit 2008 Guinness Records in Isle of Man.