This is Exotek Racing Aluminum 39T Idler Gear For Mugen Seiki MSB1. Hard anodized 7075 alloy 39T idler gear for the Mugen MSB1. Smoother mesh than the stock nylon gear. Must have for high powered racing applications. This is much stronger than the stock plastic idler gear but not indestructible so it is important to use black or white grease on the gears and reapply frequently to prolong its life along with proper slipper adjustments.
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