Optibelt VB S=C Plus - B/17 section 17mm (Across the top of the V)Classical V-belts, DIN 2215
B41.1/2 = 41.1/2 inches inside length or 1050mm
1090Ld is the datum length, so if you measure the belt in the middle all the way around.
Optibelt VB S=C Plus - B/17 section 17mm (Across the top of the V)