BD7/BD5 40T Diff Pulley Upgrade - BD-503D by Yokomo [BD-503D]

Yokomo BD-503D 40T diff pulley for BD7/BD5

Price:

CAD$3.18

Brand:

Yokomo

Model:

BD-503D

GTIN:

3888

Not Available

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Spares / Hop-ups - Yokomo - BD7 category

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Description
FAQ

40T Pulley for BD7/BD5 - Technical Summary

This replacement 40T differential pulley is sized for 1/10 on-road RC use and is supplied as a single pulley for BD7 and BD5 drivetrains. It is intended as a tuning accessory to alter ring geometry by increasing pulley diameter, which changes belt wrap and torque transfer behavior in corners.

Fitment covers a wide range of Yokomo BD-series and DP/DP-DIB variants; when fitting this pulley check mesh, bearing clearance, and spur/pinion alignment to ensure smooth operation. The unit is sold as one piece and is designed for hobby differential tuning, not for use in full-size vehicles.

Packing includes

Diff Pulley - 1 pcs

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.

What BD7/BD5 models will accept this pulley?

It fits the BD7 and BD5 related models listed in the product notes including the MRTC-BD7 and DP-DIB series. Verify your exact model code against the supported list before purchase to confirm fitment.

How does a larger 40T pulley change handling?

A larger pulley alters belt wrap and effective diff engagement geometry, which can affect mid-corner traction and throttle response; adjust diff oil viscosity and preload to tune the resulting behavior.