Originally Posted by queerpunk

People tend to go shorter on the track. It's a bit more comfortable at higher cadences.

Some people will tell you that 170s or shorter are necessary to avoid pedal-strike on the bankings, but that's not correct. I've known people who have used up to 177.5 on a 43-degree velodrome. It requires having a brain in your bucket during a neutral lap, but that's all.

If you are particular about millimeters, then yes, if you go 5mm shorter than you should raise your saddle 5mm.