"to let up would be to get passed"

Here are a few slogans:

1. "iride" (playing off apple's slogan)
2. "its all about performance" (youtube vid)
3. "cyclocrossers do it dirty" (self explanatory, yet double meaning)
4. "my cadence > your cadence" (trash talking)
5. "ride your bike" (simple, straight forward mantra)