Harrison Barnes Rebounds Prop is currently Over/Under 2.5 (-170/+132).
The money has been on the Under as it opened 3.5 @ -192 before it was bet down to 2.5 @ +132.
FACTORS THAT FAVOR THE OVER:
The Knicks have played at the 10th-fastest tempo in the league over the last 5 games while traveling, which should boost possessions for the Spurs.
FACTORS THAT FAVOR THE UNDER:
Offensive rebounds lengthen possession and create extra chances for scoring and assists, but the San Antonio Spurs rank 8thworst in in the league while playing at home with a mere 10.6 offensive boards per game this year.