Rally Wheel specs.

[broadhead]

OK, here is my first dumb question. Can someone give me a run down on how to decode those little numbers near the valve stems and sometimes on the inside of the rims. For example M1                   12                              9
                                              1   
I know this breaks down the correct year and all that but i have never been able to get my hands on any of that information.
 
Also, i've got some 15 inch Rallys with pop out centers. What were these used on? Aspins, Volarie, Roadrunner??

Thanks in advance.

[Chryco Psycho]

the pop out centers were used on mid to late 70s cars , I never figured out why the change

[Carlwalski]

People also use the rallye centers on cop rims too.....just in case you wanted to know. 

[broadhead]

Yeah, thats what i figured, late 70's stuff. I appreciate the reply's, i was beginning to wonder. I'm going to give it a little longer, those numbers mean something. Someone out there is bound to know as well as the pop out centers. I never have known that one, i've got a few theories.

Whats up with all this pollen,  WOW  I dont think i've ever saw it this thick, so early, all at one time. 

[Lunchbox]

This should tell you what you need.

http://www.restorick.com/tech/topic.asp?TOPIC_ID=64

Lunch