with fixed, it's really easy to backpedal and adjust your speed as necessary. you can dial it right in as you're turning. you don't want to brake while turning, especially not with only a front brake...as mentioned. but...yeah. you can adjust speed on a fixed while turning. make sure your gear ratio is right, too...if you have to skid into a turn, you may be just as much at risk of eating **** as you would if you leaned too far.