http://www.vintagemx.us/message_board/viewtopic.php?t=6604 me and google are best mates.
Seems the colour is the hardness of the ally.
donzzilla
PostPosted: Sat May 25, 2013 3:13 am Post subject: Reply with quote
The colors of the stickers had nothing to do with the year or style of the wheel. It was the hardness of the aluminum. Yellow was soft, red medium and green hard.
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motomwo
PostPosted: Sat May 25, 2013 6:20 am Post subject: Reply with quote
Hi Clyde, The red ones were used on trials bikes and the green ones were used on a lot of the european motocross bikes such as Maico, Husky. They also used the yellow label decals on rims that did not have the high (mud catcher) ridge.