That is because they changed to wheel and rim design that uses bolts and clamps to hold the rim in place.

@chip That means the tire with clincher are only held to the car by 4 bolts and 4 grooved tabs, correct?

Remember there is a difference in the type of rims from year to year. The true "clincher" rims were discontinued in the early 20s ('23, '24, somewhere in there). The sidewall of the rims and tires were quite different from the type we are all used to today, and cannot be interchanged with later rims. It had a groove on the outside of the rim the bead on the tire fit into. The tube held the bead into the groove on the rim and they take considerably more air pressure to do so. I don't think the tire had steel wire in the beads like the later tires. Maybe someone with clincher rims and tires can confirm that. The style shown in the picture was discontinued in about '25, or '26 on the cars but may have been used a little longer on the light trucks. That style is very similar to the model T rims and I have been told if you re-drill the tube valve stem hole into the position for the vehicle it can be used. 

@arthur-p-sell My wheels are Jaxon like these 1928 wheels

and I believe them to have clincher rims on them. The rim jack should work on this wheel.

Am I incorrect?

Hi Dick

Arthur is correct and none of the pictures you've posted are "clincher" rims.

Why do you think yours are clincher rims and do you have pictures of them?

I thought they were because I saw a video of a guy changing a Model T tire and it unhinged along the rim and looked similar to mine. I was wrong, mine unhinges along the rim and I have no idea what the nomenclature is for that rim, but it is not a Clincher Rim... TY