不一样大 1200是轮胎的横截面是12英寸.使用
轮毂为20英寸,r是
子午线轮胎.12r22.5的轮胎横截面也是12英寸,但是使用轮毂为22.5英寸的.轮胎这东西没有一样的轮胎两种标号的.尤其是r后面代表的是轮毂,0.5的不一样,就很大差距,因为是正空胎,差一点也会打不了气.
1200前面这一段是一样的,都是表示胎面宽12英寸.后面的你没写出来,通常是1200r20,是有内胎轮胎,配20寸的钢圈.12r22.5,是无内胎的
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