A 12 3/4-length winner of a rare 10-furlong allowance with a gaudy 111 Beyer Speed Figure during the Belmont Stakes Festival at Saratoga June 7, Glassman Racing’s Arthur’s Ride (Tapit) was well-backed at odds of 6-1 in Saturday’s GI Whitney Stakes at the Spa despite the presence of GI Met Mile winner National Treasure (Quality Road) and other, proven handicap horses…