diannalightning
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Patti, it's been my experience that if the tube size is 1/8, 1/2, etc, that it is a 451. If the tube size is 1.25, 1.5, etc, then it's a 406. If that's what happen to you, then the tube (20 x 1/8 will have a larger diameter than the tube that is 20 x 1.25. On the good side, if you want to sell the tubes, let me know. My Mantis has 451 tires.
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