Worcester's Seven Hills Wheelmen bike club Wed eve ride; yet another variation. One of the 10 best days of summer weatherwise and bicyclingwise (also for gliders; mid-week soaring operations underway as we passed Sterling airport). Sunny, air temp 75 F, dew pt 59 F, winds NW 6 mph. About 3 dozen riders this evening: fastest group (~ 20 riders) avg spd 21.2 mph w/ ~1500 ft of climbing; group I rode with (medium fast - 11 riders) avg spd 16.2 mph w/ 1500 ft of climbing ( last 10 miles ridden solo as I lost contact w/ group after chain drop off large chainring at mile 15 - med. fast group went on to do ~ 31 miles ) . First time ever riding on an impressive uphill stretch of Justice Hill Rd in NW corner of Sterling just over the Princeton line; the houses along this hill have really nice panaramic views of Wachusett Mtn and the two PMLP (Princeton Municipal Light Plant) wind turbines.