According to recall documents, at issue is the fact that an incorrect thread form in the rear axle fails to activate the thread locking compound delivered by the mating bolt, which can let the bolts come loose.
The problem was discovered during ongoing testing, where Triumph observed that at 20,000 miles, one of the four retaining bolts on one of its motorcycles was coming loose.
A subsequent investigation involving the supplier of the rear axle identified the root cause to be an incorrect thread form which subsequently failed to properly engage and activate the threadlocking compound supplied by the mating bolt on assembly by Triumph.
Since a loose rear brake disc bolt may contact other components on the motorcycle, and prevent the wheel from rotating freely, the recall was deemed necessary for rider safety.
To remedy the issue, Triumph dealers will replace the rear brake disc bolts, free of charge. Owner notification letters are expected to be mailed April 29, 2022.
Concerned Triumph Speed Triple owners may contact Triumph customer service at 1-678-854-2010. Triumph’s number for this recall is SRAN 596.
As always, the NHTSA is available at 1-888-327-4236 and safercar.gov.