A quick comparison of drive belts for the Honda NU50 Urban Express.
Gates 9325 belt – 0.47″ (11.9mm) x 32.880″ 36 degree angle;
A30.5 belt – 1/2″ x 32.5″
Gates AX31 belt – 0.50″(12.7mm) x 33″ (closest approximation to stock belt);
Gates A31 belt – 0.50″(12.7mm) x 33″;
A31.5/4L335 Conventional Wrapped V-Belt Specifications: Top Width 1/2″ x 33-1/2″;
Gates 9335 belt – 0.47″(11.9mm) x 33.880″ 36 degree angle;
Gates BX31 belt – 0.66″(16.8mm) x 34″
Gates B31 belt – 0.66″(16.8mm) x 34″
B31K PIX Kevlar Replacement V-Belt | 5/8 x 34
B32 belt – 0.66″ x 35″ (too big?)
A32 belt – 1/2″ x 34″
A32.5/4L345 Conventional Wrapped V-Belt Specifications: Top Width 1/2″ x 34-1/2″
Malossi 617233 belt – 0.59″(15mm) x 34.69″ 32 degree belt angle