The HBX 901a 1/12 brushless truck as reviewed here is a brushless 1/12 scale desert buggy and one of my favourite RC cars of 2021. It was light yet very durable with a very efficient power system and drive train. Short gearing ensured very lengthy battery life and ensured motor and ESC temps remained extremely low with the preference of strong acceleration over top speed. In this article I'll show you how to install a larger 14t pinion gear and talk about the performance improvements.
In my original review I mentioned that the motor mount for this car had preset motor holes that should allow the fitment of a 14t pinion and recommended the Surpass Hobby M0.6 13-17t pack. I can now confirm that these do fit as expected - see the images and steps below to do this yourself - it is very easy and takes around 5-10 minutes.
14t Pinion Install Guide
HBX 901a Review
The HBX 901a is a new 4WD brushless truck from HBX. Being 1/12 scale, it is larger than the cars they typically make. In this review we will cover off the specs and build of the truck, give you all of the performance results and finish up with a summary and recommendations plus some ideas for improvements. If available I'll post a discount coupon on my coupons and discount page
HBX have made some great releases in the 1/16 scale recently of which I've reviewed both - the 16886 Spectre desert buggy and the 16889a pro monster truck. Both have performed very well - good speed, battery life and perhaps above all else, outstanding durability. It's great to see then that they have stretched themselves and extended this brushless offering to a 1/12 scale car. This larger scale can open up a bit more heavy offroad locations with the larger size - wheels, ground clearance and presence. Before we jump into the specs, you'll see I'll reference the HBX 16889a pro a lot because a lot of the parts have been lifted from this truck. That's no bad thing as you'll find out below...