I have occasionally used my bike as part of a tarp pitch. There are lots of ways to do this and they do work, but I seldom do that anymore because:
1. It is nice to be able to ride the bike when camp is pitched.
2. A pole weighs only 2 ounces or so.
3. If I leave the pole home to shed 2 ounces, I can usually improvise something using a fence, tree, picnic table, guard rail, utility pole, stick, cliff, boulder, or some other available means of support.
4. Depending on the location and the season I might only pitch the tarp relatively infrequently preferring to cowboy camp when possible. If an unexpected rain blows in when cowboy camping I just pull the tarp over the bag without bothering to pitch anything.