From Exotek Racing:
Ultra light weight center spool set for the B64. Greatly reduces the rotating mass of your B64 for that extra boost in 13.5t and 17.5t spec racing. The Exotek spool set weighs 18gr with the spur gear- the stock diff weighs 42gr with the spur gear.
Machined 75t pom spur gear is included (replacement spur gears #1545) and bolts on to the lightweight alloy spool. Included also are coated steel outdrive cups for long lasting wear and are machined to accept the stock steel B64 center bones or the super light weight MIP puck bone system for the B64.
For non-boosted 13.5 or 17.5 classes only.