The WL toys 1/14 and 1/12 scale cars are fanstastic value and offer a myriad of options for tinkering and modding. One area where they are woefully inadequate though is gearing. They have chosen a very uncommon mod 0.7 gear pitch meaning there are very few options outside of stock because the standard 27t or even the more recent 19t offer very tall gearing only. In this gearing guide I have laid out all known available options in this guide to help you get the most out of your car.
Let's start this conversation by saying that the stick spur gear for these cars (44 teeth) is fixed - an immovable object with no alternative options*. Thus it is only the pinions we can change to alter gear ratios. Next we can say that motors with a 36mm diameter (ie stock 550 brushed, 3650 brushless, 3652 brushless and 3660 brushless cannot move closer to the top brace and therefore cannot use a smaller pinion, even with this adjustable mount. This with these motors you can use the stock 27t pinion only and the tall gearing (4.074:1)
This means that the only way to alter gear ratio is to use a smaller motor suck as a brushed 380 or 390 or a brushless 2440, 2445, 2838, 2845, 2850. This is a good thing because for the brushless motors in particular they are smaller, lighter, faster, more efficient and run cooler but with less torque they need the smaller pinions which provide shorter gearing. This is the basis of every brushless upgrade I have written which provide a much more well rounded performance for these cars. Anyway lets go directly to the options readily available.
*Custom made Mod1 spurs are available, talk to Michael Koebbe on the QuadifyRC facebook group.
Option 1: 27t stock pinion, drive ratio = 4.074:1
As I keep banging on about the stock 27t pinion gives very tall gearing and only really suited to speed running rather than offroad. The stock 550 brushed motor only just manages this one because of the large torque output it has at the expense of battery life. The downside of this tall gearing was best illustrated in the initial V1 release of the 124017 and the Eachine EAT14. Even though they used a decent sized 2845 with a relatively low 3400kv, the car cogged badly due to this gearing.
For this reason I only recommend this gearing for the stock motor or for on road speed runs with a motor 3650+ in size as per this build
Physically The 27t pinion gear has a 3.2mm bore meaning it will physically fit the following motor sizes: brushed - 540, 550. Brushless - 3650, 3652, 3660, 2838, 2845, 2850.
Option 2: 19t pinion from 144010, drive ratio = 5.79:1
Option 3: 17t pinion from A959, drive ratio = 6.47:1
Option 4: Unicorn 15t pinion, drive ratio = 7.33:1
With this pinion I have achieved to following speeds:
You can still achieve a top speed of over 70km/h on 2s with a 2445 5400kv motor and even 50km/h on 2s with a 2445 3600kv motor which is just magic for off-roading with bigger wheels and no risk over overheating. This pinion gear is something of a unicorn and is only available from two sellers on aliexpress. Both are reliable vendors and are listed below.
In my experience this is a complete list of the pinion gears that are commonly available for these cars and should provide you with a decent range of options depending on your application and depending on whether you want a straight bolt up option or a more involved one that requires filing and drilling.
Other possibilities - the Motor mounts
WL toys do not make an adjustable motor mount for the 144001 series of cars meaning you need their stock hole locations that fit pinions only of a specific size. It's amazing to think that for the same base car WL toys have actually made 4 different mounts:
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