Triumph Repair: TR4A front-end alignment settings, tr4a irs, negative camber

Question
Hi, could you possibly tell me the correct camber, toe, and caster settings for a TR4A IRS?  Also, the rear tires are showing excessive wear on the inside rims. Could this have anything to do with rear-wheel alignment? Thanks!

Answer
Hi David,
Front --
Caster = 2 deg. 40' +/- 1/2 deg.
Camber = 0 deg. +/- 1/2 deg.
toe in = Parallel to 1/16"

Rear -- IRS
Camber = 1 deg. negative +/- 1/2 deg.
toe in = Parallel to 1/16"

Excess negative Camber or any toe out will cause the inside of the tires to ware.

Howard