B-MAX4 Compatible Ring Gear Pair for Differential Rebuilds - Yokomo BM-503 [BM-503]

Q: Can changing to BM-503 ring gears affect handling?

Yesâfresh ring gears with correct mesh reduce backlash and can make drivetrain response more consistent, which may change how the model transmits power during corner entry and exit.

Yokomo BM-503 Diff. Ring Gear for B-Max4

Price:

AUD$4.73

Brand:

Yokomo

Model:

BM-503

GTIN:

3888

Not Available

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Spares / Hop-ups - Yokomo - B-Max4

B-MAX4 Ring Gear: Fit and Function

The Yokomo BM-503 is a direct replacement diff ring gear intended for use in B-MAX4 RC differential assemblies. This item is supplied as two ring gears and is designed for scale model differential rebuilds and routine maintenance rather than any real vehicle application.

For setup and tuning work on a B-MAX4, installing the correct ring gear ensures repeatable gear mesh and predictable drivetrain response. The BM-503 set is appropriate for replacing the stock ring gear when wear or tuning changes require a fresh component.

Installation notes: check that the ring gear seats flat on the differential case, set pinion-to-ring mesh with shims suited to your spur/pinion combo, and manually rotate the diff to confirm smooth operation before sealing. Use matching bearings and hardware from the B-MAX4 parts list to ensure reliable fit.

Packing includes

Diff Ring Gear x 2 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.

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B-MAX4 Compatible Ring Gear Pair for Differential Rebuilds - Yokomo BM-503 [BM-503]

B-MAX4 Ring Gear: Fit and Function

Packing includes

Can changing to BM-503 ring gears affect handling?

Are these suitable for high-power setups?

Do I need to break in new ring gears?