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What is the difference between a 400-18 and a 120/90/18? Will they interchange on a 1988 model airhead rear wheel? THANKS
 

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b4udoo
I cannot answer your question but you might want to post your question on www.bmwst.com if you don't get answer soon. I am constantly amazed how much the folks on that site know about BMW's and motorcycles in general. And they get back to you fast. Usually in less that an hour and I am NOT kidding.
 
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