Envelope spreader system for enveloping a retreaded tire

An envelope spreader system comprising:

• a chassis having an opening configured to receive a tire assembly in an upright orientation;
• a linkage assembly, the linkage assembly comprising a plurality of links rotatably coupled to the chassis and extending into the opening, wherein the plurality of links comprises:
• a primary link rotatably coupled to the chassis at a first fixed pivot point between a primary link first end and a primary link second end configured to operably engage a portion of a tire envelope;
• a secondary link rotatably coupled to the chassis at a second fixed pivot point between a secondary link first end and a secondary link second end configured to operably engage a portion of the tire envelope;
• a spreader defined in part by the primary link second end and the secondary link second end;
• and
• an actuator operably coupled to the primary link first end and the secondary link first end and configured to operate the linkage assembly between a first position and a second position.