What is the diffrence between Shimano/SRAM (M10) and Campagnolo (ED10) when

S

Scott w

New member
describing a road bike rim? I am looking to buy a new rear road bike rim after my last one was destroyed. However i can not for the life of me figure out what some of the general terminology describing the wheel means. What is Shimano/SRAM (M10) vs Campagnolo (ED10) describing?
 
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