RcThjia 32P Hardened Metal Pinion Gear Set (20T–24T, 1/8in bore 3.175mm)

If your 1/10 RC car’s motor pinion is looking a bit tired, a hardened metal replacement can make a noticeable difference. This RcThjia 32P Hardened Pinion Gear Set is designed for 32P metric pitch gearing (0.8 pitch) and comes with multiple tooth counts so you can tune how the car pulls.

That said, it’s not a universal “fit anything” part. It depends quite a lot on your motor’s pinion shaft hole size and the gearing standard you’re already running.

What this pinion gear set is for

This is a metal pinion gear kit aimed at 1/10 RC car setups, specifically those using 32P (32DP) pitch gearing with a 0.8 metric pitch. The set includes pinions with 20T, 21T, 22T, 23T and 24T teeth, which is useful if you’re experimenting with gearing for different track conditions or driving style.

On the day-to-day side, the idea is straightforward: swap a worn or damaged pinion, restore smooth engagement, and keep the drivetrain running consistently instead of grinding through rough edges.

Where it stands out (and what you’ll notice)

These gears are described as “hardened” and made from hardened steel. In practical terms, that usually means they’re built to resist wear for longer, particularly compared with softer pinions that can dull faster under load.

The manufacturer also claims the gears are made with less roughness and less noise than some other pinions, so they’re positioned as a smoother-spinning replacement.

It’s also a relief that they’re meant to be straightforward to install. If your current pinion is damaged, having a direct replacement rather than a complicated fabrication job is exactly the sort of thing that saves time.

There’s one catch to keep in mind: the listing notes compatibility around the motor pinion shaft size (an 1/8 inch hole, 3.175mm). If your current setup uses a different bore size, it may simply not match.

Key fit details you need to check before buying

The pinions in this set are specified with: - A 32P (32DP) metric pitch gearing standard with 0.8 pitch - A 1/8 inch hole size for the pinion (listed as 3.175mm) - Tooth counts: 20T, 21T, 22T, 23T, 24T

Before you order, it’s worth checking that your motor pinion shaft uses that bore size and that your drivetrain is already on a 32P pitch system. If the pitch doesn’t match your spur gear, you’ll be trying to force incompatible gearing—bad news for noise, wear, and overall smoothness.

Best use cases for RC drivers

This set makes the most sense if you: - Want a hardened metal pinion replacement for a 1/10 RC car - Prefer multiple tooth options so you can adjust gearing without buying separate pinions each time - Are chasing smoother engagement and potentially reduced drivetrain noise versus rougher pinions

A simple micro-scenario: imagine you’re heading to a tighter circuit where acceleration out of slower corners matters more. Swapping to a different tooth count from the included range can help you fine-tune the feel—rather than being stuck with whatever your old pinion had.

When it may not be the best choice

It may not be a great match if your current motor pinion has a different shaft hole size (even if everything else sounds compatible). The listing is quite clear that the 3.175mm bore is part of the expected fit.

Also, if your priority is squeezing out maximum performance with a highly specific gearing ratio for one exact setup, a “range of common tooth counts” kit can feel a bit general. It’s more of a practical replacement and tuning bundle than a precision, single-configuration solution.

The essentials: are hardened 32P pinions worth it?

On paper, hardened steel pinions are a sensible move when you’re dealing with wear, rough running, or drivetrain noise. They’re also typically easier to justify when you’re maintaining an RC car you actually use.

You’ll get the most value if your setup already aligns with 32P pitch and the motor bore is 3.175mm. If those two points are true, this kit looks like a tidy way to refresh your gearing and keep spares in reach.

Final verdict

It’s a good fit if you run a 1/10 RC car on 32P (0.8 pitch) gearing and your motor pinion shaft uses a 1/8 inch hole (3.175mm), especially if you want a hardened steel replacement and the option to move between 20T and 24T teeth.

You may want to skip it if you’re unsure about the pitch standard or the bore size—there’s a real risk it won’t line up with your current motor pinion. Better avoided if you’re hunting for a very specific gearing solution tailored to one exact build, because this set is designed as a practical range, not a one-ratio answer.

Frequently asked questions

Will this work with any 1/10 RC car?

It’s aimed at 1/10 RC cars, but compatibility depends on your gearing pitch (32P / 0.8 pitch) and the motor pinion shaft hole size (1/8 inch / 3.175mm).

What tooth counts are included?

The set includes 20T, 21T, 22T, 23T and 24T pinion gears.

Is it made from metal or plastic?

It’s described as hardened steel pinion gears, designed for durability.

Is it meant as a replacement for a damaged pinion?

Yes—the listing positions it as an ideal replacement for an old or damaged pinion, with the added goal of smoother running and reduced noise.