US-based World Superbike rider Jason Pridmore has been forced to withdraw from the rest of the 2008 season after recurring problem with compartment syndrome, better known as arm pump, in his left forearm.
The American has been racing with the Alto Evolution Honda squad and will be replaced by AMA Superbike rider Mat Lynn. A team spokesman said: "We were happy and motivated by Jason’s improvements this season and were looking forward to this weekend."