ARRMA AR102546 Manual - Manual (Page 21)

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21
Spur/Pinion Gear Removal and Replacement
Gear Chart
Your ARRMA kit has one gear ratio and this can be altered by changing the pinion or spur gear in the
transmission. The standard gearing of your kit is designed to give the best compromise between speed and acceleration. Increasing the
top speed will reduce acceleration and vice versa. Too low or high a gear will put strain on the motor/ESC, and potentially damage them.
The numbers shown in chart is the number of times the spur gear is larger than the pinion, or the ‘gear ratio’. Essentially this is number
of rotations the motor/pinion gear has to rotate the larger spur gear once. The lower the ‘gear ratio’ the greater the potential top speed,
the higher the ‘gear ratio’ the greater the potential acceleration.
Upgraded motors/ESCs and non-standard wheels may require different gear ratios. Try to find the best balance between speed/
acceleration and handling/performance. For help selecting the correct gear ratio for your upgrades visit the GO FOR IT forums at
GOFORIT-RC.com.
Once you replaced the pinion or spur gear ensure you have set the gear mesh correctly - see page 13 for details.
Standard Gear Ratios *1 = Raider/ADX-10 *2 = Fury/Mojave/Vorteks *3 = Granite
Drivetrain Tuning
Pinion Gear (T=Tooth) 9T 10T 11T 12T 13T 14T 15T 16T 17T 18T 19T 20T
Spur Gear
54T 0.8M 4.5 4.15 3.86 3.6 3.38 3.18*¹ 3 2.84 2.7
57T 0.8M 6.33 5.7 5.18 4.75 4.38*³ 4.07 3.8*² 3.56 3.35
Tools Required
or
Cross Wrench
5.5 & 7mm Nut Driver
1.5 & 2mm Hex Drivers
1
Pinion Gear Removal
2
Spur Gear Removal
Remove rear right wheel with 7mm nut
driver/cross wrench.
Loosen motor bolts with 2mm hex driver and loosen
pinion gear grub screw with 1.5mm hex driver. Remove
pinion. Fit new pinion and set gear mesh (page 13). Refit
spur gear cover and wheel.
Remove spur gear cover with 2mm hex
driver
Loosen motor bolts with 2mm hex driver. Undo slipper
nut with 5.5mm nut driver or cross-wrench. Remove
slipper clutch mechanism and spur gear. Fit new spur
gear, set gear mesh and adjust slipper (page 13). Refit
spur cover and wheel.
Slipper
Pads
PN:
310018
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