This is the Exotek B64 Flite Center Spool Set for 17.5 & 13.5 Spec Racing. This 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.
A machined 75T POM spur gear is included (replacement spur gears EXO1545) 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.
Also compatible with standard 48p Kimbrough spur gears KIM144 , KIM145, etc.
To install in the B64 that has the slipper you just need the B64 center shafts for the diff gear and use the gear cover for the diff gear.