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Description
ARRMA Spool Gear 29T MOD1 8mm Bore Steel ARA310950The ARRMA ARA310950 Spool Gear is a 29T MOD1 steel drivetrain tuning gear designed for compatible ARRMA spool shaft setups needing fine gearing adjustment and secure 8mm bore fitment. Features Gearing Tuning Option: Allows compatible ARRMA vehicles to be geared for different speed, acceleration, and driving conditions Strong Steel Construction: Durable steel material supports long lasting performance in extreme RC conditions 29 Tooth Gear: 29T spool
The ARRMA ARA310950 Spool Gear is a 29T MOD1 steel drivetrain tuning gear designed for compatible ARRMA spool shaft setups needing fine gearing adjustment and secure 8mm bore fitment.
Features
- Gearing Tuning Option: Allows compatible ARRMA vehicles to be geared for different speed, acceleration, and driving conditions
- Strong Steel Construction: Durable steel material supports long-lasting performance in extreme RC conditions
- 29 Tooth Gear: 29T spool gear provides a tuning option for compatible ARRMA speed and spool drivetrain setups
- MOD1 Tooth Profile: Precision manufactured MOD1 teeth help provide smooth operation with compatible drivetrain components
- 8mm Bore Fitment: Designed to fit an 8mm diameter spool shaft
- Secure Mounting Design: Precision manufactured set screw holes allow the gear to be secured on both sides of the spool shaft
- Mounting Hardware Included: Supplied with M4 set screw and M4 screw pin for installation
Specifications
- Brand: ARRMA
- Part Number: ARA310950
- Product Type: Spool gear
- Tooth Count: 29T
- Gear Pitch: MOD1
- Bore Size: 8mm
- Material: Steel
- Hardware: M4 x 4mm set screw and M4 screw pin included
- Application: Compatible ARRMA spool shaft drivetrains using 8mm bore MOD1 spool gears
- Intended Use: Gearing adjustment, drivetrain tuning, replacement, and speed setup work
Includes
- 1 x ARRMA 29T MOD1 spool gear with 8mm bore
- 1 x M4 x 4mm set screw
- 1 x M4 screw pin
FAQ
What is the ARRMA ARA310950 spool gear used for? The ARRMA ARA310950 spool gear is used to fine tune gearing on compatible ARRMA spool shaft drivetrains using an 8mm bore MOD1 gear.
What bore size does this gear have? The ARRMA ARA310950 spool gear has an 8mm bore for compatible 8mm spool shafts.
What tooth count is the ARRMA ARA310950 gear? The ARRMA ARA310950 spool gear has 29 teeth and a MOD1 tooth profile.
Does this gear include mounting hardware? Yes. The ARRMA ARA310950 gear includes one M4 x 4mm set screw and one M4 screw pin.
Will this fit every ARRMA vehicle? No. OZRC recommends checking your ARRMA vehicle manual or exploded diagram to confirm ARA310950 is the correct 8mm bore MOD1 spool gear before installation.
Important Notes
- Designed for compatible ARRMA spool shaft setups using an 8mm bore MOD1 spool gear.
- Check your vehicle manual, exploded diagram, motor shaft size, and gear mesh requirements before fitting.
- This listing is for the spool gear and included mounting hardware only. Spool shaft, motor, pinion gear, bearings, and other drivetrain components are not included.
- Changing gearing can affect motor temperature, ESC load, acceleration, and top speed. Monitor electronics temperatures after installation.
Shipping Notes
- Free Standard Shipping on $100+ Orders to the USA.
- Except Preorder products are shipped in 48 hours.
- Delivery to the USA:
- Standard Shipping : 3-10 business days
- If time is of the essence, please consider selecting expedited delivery for faster service.
Exchange/Return Notes
- We offer a 30-day return/exchange service after receiving.
- Final sale items are not eligible for returns or exchanges.
- To process your return/exchange, please contact us at [email protected]
- Please click here for more details>>> Return & Exchange Policy
4.2 ★★★★★
Based on 5 reviews
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Product Reviews
★★★★★ 5
Durable, high-bounce dog balls that hold up well to energetic play
Color: D) 4-Pack 3" Balls (Yellow)
The Chew King 3-inch rubber balls have been great for active play sessions. The rubber feels thick and durable, and the bounce is surprisingly lively compared to many standard dog balls. They’re the perfect size for medium to large dogs and are easy for dogs to carry, chase, and retrieve. After repeated games of fetch, the surface has held up well without cracking or losing its shape.
One thing that stands out is how easy they are to clean. Dirt and slobber rinse off quickly, so they’re ready for the next round of play. The bright color also makes them easier to find in grass or bushes compared to darker toys.
For longer life, it helps to supervise play if your dog is a very aggressive chewer, since these are designed more for fetch than constant chewing. Also, rotating toys every few days can keep dogs more engaged and extend the lifespan of each ball. Overall, this is a solid set of durable fetch balls that provide great bounce and reliable outdoor playtime fun.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on March 5, 2026
★★★★★ 5
toughest dog balls in the world
Color: E) 8-Pack 2.5" Balls (Yellow), Color: E) 8-Pack 2.5" Balls (Yellow)
best balls in the universe. I have a 70# pit bull and a 120# presa canaria. All the other balls I bought lasted maybe 3 weeks, I have had these for over a year and play with them and the dogs 5-6 days a week. They still look brand new, They seem like they will last a year or so and they are both serious chewers. A presa has a bite force od about 525psi, twice a pitty
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Reviewed in the United States on April 24, 2026
★★★★★ 5
They worked out great!!!
Color: D) 4-Pack 3" Balls (Yellow), Color: D) 4-Pack 3" Balls (Yellow)
So far have been the solution we were looking for! I was extremely tired of the non stop destruction and order of large Chuckit balls for our high energy/high drive dog. For about the same price I bought four 3 inch balls to test out their durability and fit for the thrower. THEY WORK! Perfection! They even make a fun whistling sound as they sail through the air. They do require a tad more muscle in the thrower but that is not a problem. They have already shown to be WAY more durable. The 3 inch balls work in the large chunkit thrower. Super find.
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Reviewed in the United States on April 9, 2026
★★★★★ 4
Durable
Color: E) 8-Pack 2.5" Balls (Yellow)
My dogs love them. They are very bouncy, and ideal size, and durable. Great alternative to a tennis ball which in my house only last 30 minutes.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on March 23, 2026
★★★★★ 5
Toughest dang balls I ever played with
Color: D) 4-Pack 3" Balls (Yellow), Color: D) 4-Pack 3" Balls (Yellow)
These things are amazing. We have a ball obsessed Husky mix and he has destroyed Kongs, Chuck Its, and a whole lot of other ball shaped objects. These things? We bought the 4 pack because we bought 4 Chuck Its and they lasted a year, all 4 of them only a year, before they were destroyed. A year after buying these? We only bought more because he lost 3 of them. I think we did find one under the dresser after buying this pack... But the others? They either ended up thrown over the fence into the woods or lost in the holes in the yard the monster digs up. Other than a few pockmarks from his teeth and maybe some mud, they may as well be brand new even after a year or two. Probably the most chew resistant thing we've ever bought him. They're really solid rubber and since he hasn't managed to bite into them to take out a chunk, they're safe as hell. Being as big as they are, I don't worry he's gonna choke unattended on them like the usual size of ball. About the only concern is forcing breaks so he can have breathing moments when he manages to talk us into fetch outside. It fits in the larger Chuck It thrower too, so we haven't lost any value from having those torn up.
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Reviewed in the United States on April 26, 2026