Weird Shifter

WillGTJumper
WillGTJumper Posts: 505
edited September 2007 in MTB workshop & tech
I was just riding my bike after doing a small bit of dirt jumping, and my rear shifter wouldn't go up a gear. I didn't really fix it, just the chain came off and then when I put it back on the shifter shifted up. If it happens again how do I fix it and why did it not shift up?

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