Originally Posted by
chaadster
How in the dickens you'd trim tape width is a mystery to me, let alone why, rather than just buying the proper width.
I go the Gorilla Tape method on my MTB. Trimming is easy. Measure the width, notch it on the tape, peel. It peels where you notched it.
As for why not buy the proper width? A roll of Gorilla Tape is $5, and there's enough to do each wheel twice.