NRG's lightweight Nylon H78 driven bull gear sprockets are available in a variety of offsets, in 30, 40, and 48 tooth varieties. Unlike metallic driven sprockets, NRG's Nylon offset sprockets do not corrode and are much easier to assemble. At 1/3th the weight of its metallic driven counterpart, these non-metallic driven gears are very strong and abrasion resistant. Bigger offset Nylon bull sprockets come with segmental teeth for easy replacement, while the smaller offset variety has integral teeth cast with the hub. NRG Driven sprockets are also available in c-hub and b-hub designs and in cast iron, UHMW-PE on cast iron body, or 100% UHMW-PE materials. Contact your local NRG representative or distributor for more information. Part No. No. of Teeth P.D. (in) Segs Max Bore LTB (in) Offset * Hub Bolts NM7830TN 30 24.96 0 4-15/16 4 0 4 NM7840TSN 40 33.25 0 5-7/16 3-3/4 3-7/16 4 NM7840TBN 40 33.25 8 5-7/16 6-7/8 6-3/8 4 NM7848TN 48 39.89 8 5-7/16 6-7/8 6-7/8 4 * Spacers may be used, if applicable, to make the inside edge of the hub flush with the wall bearing. Offset may be reduced to a lesser dimension but not increased. LTB's will increase as offsets decrease by like amounts.