Traxxas TRX-4M Defender

Stock is as the vehicle ships. Calculated is worked from the stock figures on this page rather than stored beside them, so the two cannot drift apart. Not published means it exists but no source we could find prints it.

How these numbers were settled

The product page prints 'Gear Ratio (Internal): 11.38:1', which is not the complete reduction.

• Traxxas's stock replacement gear set, part 9776 'High-Range (Standard) Transmission Gear Set', is described as 'a direct replacement for stock TRX-4M transmission gears.
• The package includes a full set of transmission gears and an 11-tooth pinion gear with a total 16.6:1 reduction ratio', and Traxxas's TRX-4 family comparison chart independently lists this model at '16.6:1 (Standard)' alongside the optional 40.3:1 (Crawl) and 9.7:1 (Speed) sets.
• A printed total outranks a printed 'Internal', so the final drive is 16.6 and 11.38 is the ratio after the spur.
• They reconcile: 16.6 x 11 / 11.38 = 16.0, i.e. an approximately 16-tooth transmission input gear on the published 11-tooth pinion.
• The spur is blank because Traxxas does not print that tooth count, so the spur, pinion and ratio identity is not asserted.
• Single-speed direct drive, so no high/low split.
• Brushed Titan 180 87-turn motor, so KV and cell count are blank and no no-load speed check is possible.
• The tire diameter of 2.2 in (55.9 mm) is from the Traxxas comparison chart's '1.0" x 2.2" Canyon AT': 1.0 in is the wheel, 2.2 in the tire outside diameter.

Sources

• trx-4m-land-rover-defender-…traxxas.com (opens in a new tab)
• 9776traxxas.com (opens in a new tab)
• Manual (PDF)traxxas.com (opens in a new tab)

Every figure on this page traces to one of these. Where they disagreed, the note above says which was used and why.

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