Have read the owners manual. --have changed other tires on “older” models similar-but without the “safety” restainer. Know how to remove the “T” from the tire–it is getting it to drop out of centering retainer that I have been having problems with-talked to a “tire store” and the gentleman there said he would brake the safety device and just “trust” the cable to hold the tire up. There must be someone out there who has dealt with this “improved” design.