Traxxas Summit 4WD

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

Two-speed, resolved cleanly.

• The product page prints 'Gear Ratio (Internal): 25:1 (high range) 70:1 (low range)' and the owner's manual prints two formulas: 'To find High Gear: # Spur Gear Teeth / # Pinion Gear Teeth x 5.22 = Final Gear Ratio' and 'To find Low Gear: ... x 14.45 = Final Gear Ratio'.
• The manual says the truck is 'equipped from the factory with a 68-tooth spur gear and 14-tooth pinion gear', and its chart cell for 14/68 reads 25.34 (high) and 70.18 (low). 68/14 x 5.22 = 25.35, matching the chart to 0.06%, and 68/14 x 14.45 = 70.19, matching 70.18.
• On this model the published 'Internal' figures are the complete final drives and 5.22 is the true ratio after the spur.
• High gear is used as the final drive because this is a top-speed calculator; low gear is 70.18:1.
• The motor is a brushed Titan 775, so KV and the cell count are left blank and no no-load speed check is possible.
• The tire diameter is Traxxas's own '7" Canyon AT extreme-terrain tires' (7.0 in = 177.8 mm); the 3.8 in figure on the same page is the Geode wheel, not the tire.

Sources

• 56076-4-110-summit-4x4-extr…traxxas.com (opens in a new tab)
• Manual (PDF)static.summitracing.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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