Yokomo B9-501GAA BD9 Aluminium Drive Cup - Lightweight Racing Part  [B9-501GAA]

Yokomo B9-501GAA Aluminum drive cup for BD9 Gear diff
Price:
£8.60
Brand:
Yokomo
Model:
B9-501GAA
GTIN:
0639342204656
Condition:
Brand New
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Reduce Gyroscopic Drag with an Aluminium Drive Cup

The Yokomo B9-501GAA aluminium drive cup is made for the BD9 gear differential and finished with a hard anodise. Its lightweight construction reduces rotating inertia to improve throttle response and lessen gyroscopic resistance. The cup is compatible with a resin protector on the universal shaft side, preserving compatibility with common shaft protections. Reducing rotating weight helps the chassis turn more predictably during quick direction changes.

Model Fitment and Performance Notes

This drive cup fits a variety of Yokomo chassis including MRTC-BD919, MRTC-BD10, and MSR-BDFWD. Swapping to aluminium reduces mass versus standard steel options and can improve drive efficiency, which is useful for fine tuning handling and responsiveness in competitive setups.
Remark :
Due to limited stock availability, please notice that some Yokomo items may have to order from the factory and the ready time is around 4-6 weeks. Customer purchases the item is assumed to accept the waiting time which allows us to order directly from the manufacturer if the item is out of our warehouse.

Will this part affect corner entry or exit?

The reduced rotating mass tends to make transitions smoother and can aid corner exit by lowering gyroscopic resistance, though changes are subtle and setup dependent.

How often should I inspect the drive cup?

Inspect the cup during routine diff checks or after heavy running sessions. Look for scoring or looseness and ensure the resin protector is intact.

Is specific setup advice available for different track surfaces?

Lighter rotating parts can feel more responsive on high grip surfaces; you may prefer slightly heavier diff oil on low grip tracks to maintain traction. Adjust progressively to find the best balance.

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