One thing I'll add... riding bar-to-bar and wheel-to-wheel works for geared road bikes and experienced riders, but doesn't work so well for fixed riders... keep enough space between you that if someone has to make an evasive move that you know your escape route without downing the group.
If you're not confident about group riding, use caution.
Most important on corners... HOLD YOUR LINE! If you're on the outside before you enter, do NOT attempt to take the inside line no matter how hard holding the outside line is.
One thing I'll add... riding bar-to-bar and wheel-to-wheel works for geared road bikes and experienced riders, but doesn't work so well for fixed riders... keep enough space between you that if someone has to make an evasive move that you know your escape route without downing the group.
If you're not confident about group riding, use caution.
Most important on corners... HOLD YOUR LINE! If you're on the outside before you enter, do NOT attempt to take the inside line no matter how hard holding the outside line is.