Sidewall splits.
I normally super-glue a bit of old sidewall to the inside. It works really well, but problem is (I guess) the superglue isn't flexible enough. The patch often comes adrift after a few weeks.
Yes I'm a cheapskate, it serves me well. I've just grudgingly binned a nice Maxxis with only four patches, after one just won't stay put. - So what glue works well?

