ARRMA Kraton 6S vs 8S: Upgrade Differences & Which Parts Fit Both
If you own an ARRMA Kraton, one question comes up constantly in the RC hobby community: Can I use the same upgrade parts for my 6S and 8S build? The answer is more nuanced than a simple yes or no — and understanding the differences can save you money and prevent costly mistakes. In this guide, we'll break down the key structural differences between the ARRMA Kraton 6S and 8S, highlight which aluminum and steel upgrade parts are compatible with both platforms, and show you exactly which parts to prioritize for each version.
Why the 6S vs 8S Distinction Matters for Upgrades
The ARRMA Kraton 6S (BLX) and the Kraton 8S (EXB) were designed for different performance levels. The 8S platform runs significantly higher voltage, which means beefier drivetrain components, wider stance, and different mounting points on key chassis areas. While they share the same iconic monster truck DNA, the upgrade ecosystem for each is distinct in several important ways:
- Wheel hex size: Both platforms use 17mm hex hubs, but hub depth and bolt pattern can vary. Always verify part fitment before ordering.
- Chassis width: The 8S EXB runs a wider chassis, so arms and suspension links are generally NOT cross-compatible.
- Motor mount & ESC tray: Different between 6S and 8S — platform-specific parts only.
- Servo horn thread: Both accept 23T servo arms, making steering upgrades one of the few universal items.
Parts That Fit BOTH Kraton 6S and 8S
Despite their differences, several upgrade categories work across both platforms:
1. 17mm Wheel Hex Upgrades
The 17mm hex hub is one of the most popular upgrades for any large-scale ARRMA. Both the Kraton 6S and 8S use 17mm hex hubs, and aftermarket aluminum hex sets fit both models. The key variable is hex thickness: 13.6mm thick hubs suit stock wheel offsets, while 16.5mm thick hubs are ideal if you're running wider wheels or want additional offset. Red and black anodized options are available for both.
2. Aluminum Servo Arms (23T)
The handbrake module servo arm upgrade — particularly the 23T aluminum servo arm for the Felony/Infraction/Kraton 6S platform — provides a more rigid connection point than the stock plastic arm. If you've experienced servo stripping or sloppy steering, this is one of the first upgrades to make.
3. Front Steering Block Upgrades
The front steering block is a high-stress component that takes punishment during hard bashing. Aluminum upgrade steering blocks for the Kraton 6S (Notorious/Outcast/Kraton 6S compatible) offer dramatically better durability than stock plastic, especially in high-speed crashes where the plastic stock block can crack or snap entirely.
Parts That Are 6S-Specific
The following upgrade categories are typically platform-specific to the Kraton 6S and should NOT be assumed compatible with the 8S EXB without verification:
- Suspension arms (upper/lower): Geometry differs; use 6S-rated arms for 6S builds.
- Chassis braces: 6S and 8S chassis have different brace hole patterns.
- Bulkheads and diff cases: 8S uses larger, more robust internals. 6S parts won't survive 8S power.
- Shock towers: Mounting distance and hole spacing vary between platforms.
Parts That Are 8S-Specific
Conversely, the Kraton 8S EXB requires its own line of heavy-duty upgrades due to the higher torque and impact forces involved:
- 8S-rated aluminum skid plates: Larger footprint, thicker material.
- Center diff upgrades: Must be 8S-rated to handle the increased voltage load.
- 8S-compatible wheel hex adapters: While the hex size is the same, thread depth and material thickness matter more at 8S power levels.
Our Recommendation: Build Smart, Not Just Fast
Whether you're running 6S or 8S, the upgrade philosophy is the same: start with the parts that break first. For most ARRMA Kraton owners, that means wheel hexes, steering blocks, and servo arms are top priority. These components take the most abuse and deliver the most noticeable improvement in durability when upgraded to aluminum.
Check out our top 8 ARRMA 6S upgrade picks below — all tested for durability and fitment compatibility:
Arrma 6S Wheel Hex 17mm (16.5mm Thick) With Nut Set Black
$34.99 Shop Now
Arrma 6S Wheel Hex 17mm (16.5mm Thick) With Nut Set Red
$34.99 Shop Now
Arrma 6S Wheel Hex 17mm Upgrades Black
$13.99 Shop Now
Arrma 6S Wheel Hex 17mm Upgrades Red
$13.99 Shop Now
Arrma 6S Wheel Hex 17mm (13.6mm Thick) With Nut Set Black
$34.99 Shop Now
Arrma 6S Wheel Hex 17mm (13.6mm Thick) With Nut Set Red
$34.99 Shop Now
Arrma 6S Aluminium Handbrake Module Servo Arm 23T
$19.99 Shop Now
Arrma 6S Kraton Notorious Outcast Front Steering Block Upgrade
$34.99 Shop NowQuick Compatibility Reference Table
| Upgrade Category | Kraton 6S | Kraton 8S |
|---|---|---|
| 17mm Wheel Hex Upgrades | ✅ | ✅ (verify thickness) |
| 23T Servo Arms | ✅ | ✅ |
| Front Steering Blocks | ✅ | ❌ (8S specific) |
| Suspension Arms | ✅ | ❌ (8S specific) |
| Chassis Braces | ✅ | ❌ (different pattern) |
FAQ: ARRMA Kraton 6S vs 8S Upgrade Questions
Q: Are ARRMA Kraton 6S and 8S wheel hexes the same size?
A: Both platforms use 17mm hex hubs. However, the thickness and mounting depth can vary between specific upgrade models. Always check the product listing to confirm compatibility with your truck's year and variant before purchasing.
Q: Can I run 8S power in my Kraton 6S with upgraded parts?
A: No. The Kraton 6S drivetrain, gearboxes, and chassis are not rated for 8S power levels, even with aluminum upgrades. Running 8S voltage in a 6S truck risks catastrophic failure of the motor mounts, bulkheads, and drivetrain. Stick to 6S power for 6S platform builds.
Q: What are the first upgrades I should make to a stock ARRMA Kraton 6S?
A: Prioritize in this order: (1) Aluminum wheel hexes — the stock plastic hexes strip easily under hard driving. (2) Front steering block — plastic blocks crack in high-speed crashes. (3) Servo saver or aluminum servo horn — prevents servo stripping. These three upgrades address the most common failure points.
Q: Is the ARRMA Kraton 8S just a bigger Kraton 6S?
A: It's more than just a size upgrade. The 8S EXB uses a completely different ESC/motor system, wider chassis, and a more robust drivetrain. Think of it as a separate platform that shares cosmetic design language with the 6S, not a direct scale-up of the same truck.
