30z Crown Gear Bronze Line Step 2 Displacement 1mm

Slot.it SIGO30BZ: in-line bronze crown gear with Step 2 offset for precision transmissions

When the chassis configuration demands millimetric accuracy, the transmission components make the difference between a car that runs smoothly and one that destroys gears in just a few sessions. The SIGO30BZ crown gear from Slot.it meets this need with a specific design for in-line motor mounts with raised rear axles.

Function and performance

This 30-tooth crown gear operates in an in-line configuration, meaning the motor is mounted longitudinally — perpendicular to the rear axle — which helps lower the centre of gravity of the assembly. Its most defining feature is the Step 2 offset of 1mm: the teeth are axially displaced from the standard plane, allowing compensation for the raised rear axle in certain motor mounts.

The result is correct mechanical alignment between the crown gear and pinion, with no lateral stresses, no abnormal noises, and no premature wear of the teeth. The bronze core ensures a firm fit on the axle and better absorbs high-frequency vibrations that occur during prolonged competition sessions.

• Number of teeth: 30z
• Diameter: 17.3 mm
• Module: 50
• Core: bronze
• Axle compatibility: 3/32" (2.38 mm)
• Offset: Step 2 — 1mm
• Mounting: in-line

Compatibility

As a module 50 piece, it fits with the entire range of Slot.it pinions of the same module. It is the usual choice in chassis that use in-line motor mounts with raised axles, such as those designed for Sport track (compatible with Scaleauto and Slot.it tracks, among others). Always check the specifications of your motor mount to confirm that it requires Step 2 before mounting this crown gear.

Installation and preparation

The fit on the 3/32" axle must be done with the appropriate tool to avoid damaging the bronze core. Once mounted, visually check that the teeth are aligned with the pinion throughout the axle's rotation. If you notice that the tooth flank is not working uniformly, check that the motor mount is indeed a raised axle (Step 2) and not a standard mount.

Common mistakes

The main mistake is mounting this crown gear on a standard mount without offset. In that case, the crown gear and pinion will not be in the same plane, resulting in incorrect contact between the teeth, excessive noise, and accelerated wear of both parts. Reserve this reference exclusively for Step 2 mounts.

Another common mistake is not checking the axial play after installation. A well-fitted bronze core should not have lateral play: if there is any, check the diameter of your axle before tightening definitively.

Frequently asked questions

What is the difference between a Step 1 and a Step 2 crown gear?

The Step indicates the axial displacement of the teeth relative to the standard plane. Step 1 corresponds to 0.5mm of displacement and Step 2 to 1mm. Each value is designed for motor mounts with different degrees of raised rear axles. Installing the wrong Step causes misalignment between the crown gear and pinion.

Is it compatible with pinions from other brands?

Being module 50, it can mesh with any pinion of the same module, regardless of the brand. However, to ensure maximum precision and durability, Slot.it recommends using its pinions from the same range, as the manufacturing tolerances are optimised to work together.

Why choose a bronze core over a plastic core?

Bronze offers a firmer grip on the metal axle, better withstands torsional forces during sudden accelerations, and has a lower tendency to slip or loosen due to the heat generated during competition. It is the preferred option in high-demand categories.

Can I use this crown gear in a sidewinder or anglewinder configuration?

No. This crown gear is specifically designed for in-line mounting. For sidewinder or anglewinder configurations, Slot.it offers specific references with tooth geometry adapted to each type of transmission.

Which Slot.it pinions is it compatible with?

With all module 50 pinions from the Slot.it range. The selection of the number of teeth on the pinion will determine the final gear ratio, which you can adjust based on the layout and characteristics of the motor you use.

The Slot.it SIGO30BZ is a 30-tooth in-line bronze crown gear featuring a 1mm axial offset (Step 2), engineered for slot car chassis with raised rear axle motor pods. With a 17.3mm diameter, module 50 tooth profile and 3/32" bronze hub, it delivers precise meshing, reduced noise and long-lasting durability in club and competition environments. Compatible with all Slot.it module 50 pinions and Sport-track systems.