20” x 1 1/8” 
A= Internal Diameter (when eyelets, then eyelets to eyelets): 429mm
B= Rim Thickness (when eyelet, includes eyelet): 3mm
C= ERD: 489mm
 
20” x 1 1/8” - 1 3/8"
A= Internal Diameter (when eyelets, then eyelets to eyelets): 424.2mm
B= Rim Thickness (when eyelet, includes eyelet): 3mm
C= ERD: 484.2mm
 
20” x 1.75"
A= Internal Diameter (when eyelets, then eyelets to eyelets): 387.6mm
B= Rim Thickness (when eyelet, includes eyelet): 3mm
C= ERD: 447.6mm

20” x 1.75" OS
A= Internal Diameter (when eyelets, then eyelets to eyelets): 429.6mm
B= Rim Thickness (when eyelet, includes eyelet): 3mm
C= ERD: 489.6mm
 
24” x 1.75"
A= Internal Diameter (When eyelets, then eyelets to eyelets): 487.6mm
B= Rim Thickness (when eyelet, includes eyelet): 3mm
C= ERD: 547.6mm