Caster and camber are fixed, no adjustment, on the Spyder front ends. The only adjustment is toe-in/out.
The belt position on the pulleys is quite sensitive to adjustment. I would make sure the belt is properly adjusted for the first alignment. As long as the same belt remains aligned, the wheel alignment shouldn't be impacted, even if the rear tire has been changed.
One of the things that affects toe-in is the ride-level of the suspension. According to Mike Loescher, the relationship of the suspension components allows for variable toe-in/out as the suspension ranges through its motion limits. If I remember correctly, compressing the front suspension drives more toe-out into the system. A 50th percentile male ryder will have a different compressed dimension than no weight or a two-up 75th percentile ryder pair. I suspect the wheel alignment folks take that into consideration when setting the alignment.
Wayne
The belt position on the pulleys is quite sensitive to adjustment. I would make sure the belt is properly adjusted for the first alignment. As long as the same belt remains aligned, the wheel alignment shouldn't be impacted, even if the rear tire has been changed.
One of the things that affects toe-in is the ride-level of the suspension. According to Mike Loescher, the relationship of the suspension components allows for variable toe-in/out as the suspension ranges through its motion limits. If I remember correctly, compressing the front suspension drives more toe-out into the system. A 50th percentile male ryder will have a different compressed dimension than no weight or a two-up 75th percentile ryder pair. I suspect the wheel alignment folks take that into consideration when setting the alignment.
Wayne