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Description
ARRMA 39T MOD1 Spool Gear 8mm Bore ARA310951The ARRMA ARA310951 39T MOD1 Spool Gear is a steel 8mm bore drivetrain tuning gear designed for compatible ARRMA spool shaft setups needing adjustable gearing and smooth power transfer. 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 service life in demanding RC use 39 Tooth Gear: 39T spool gear
The ARRMA ARA310951 39T MOD1 Spool Gear is a steel 8mm bore drivetrain tuning gear designed for compatible ARRMA spool shaft setups needing adjustable gearing and smooth power transfer.
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 service life in demanding RC use
- 39 Tooth Gear: 39T spool gear provides a lower gearing option compared with smaller tooth-count spool gears
- 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 Hardware: Includes set screw and screw pin hardware for secure installation on the spool shaft
Specifications
- Brand: ARRMA
- Part Number: ARA310951
- Product Type: Spool gear
- Tooth Count: 39T
- Gear Pitch: MOD1
- Bore Size: 8mm
- Material: Steel
- Hardware: M4 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 39T MOD1 spool gear with 8mm bore
- 1 x M4 x 4mm set screw
- 1 x M4 screw pin
FAQ
What is the ARRMA ARA310951 spool gear used for? The ARRMA ARA310951 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 ARA310951 spool gear has an 8mm bore.
What tooth count is the ARRMA ARA310951 gear? The ARRMA ARA310951 spool gear has 39 teeth and a MOD1 tooth profile.
Does this gear include mounting hardware? Yes. The ARRMA ARA310951 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 ARA310951 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.
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Exchange/Return Notes
- We offer a 30-day return/exchange service after receiving.
- Final sale items are not eligible for returns or exchanges.
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4.7 ★★★★★
Based on 12 reviews
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Product Reviews
★★★★★ 5
Fallen Angels, fae, vampires, oh my!
Format: Kindle
Rating: 4.5 | Spice: 2 (but a good slow-burn)
•
Main Characters: Huntyr and Wolf
•
I couldn’t wait to read this book; there was so much hype about it! And there was no doubt why. I fell in love with the characters and the plot itself. This book is mainly plot driven more than friction driven but it’s easy to follow along with. The characters are fun, easily understood. The main setting is at an academy where both the main characters are going through trials and building strength for the final test, The Transcendent. There are fantastic side characters as well. I loved the camaraderie between Huntyr and her friends. But we don’t like Lanson. 😆
We do have some plot twists that come into play throughout the book. Secrets and betrayal to be seen. I did adore Wolf and Huntyr’s relationship. It was a classic slow burn trope. They didn’t hit it off fast, but in time their feelings grew. I loved their banter, so sexy. Wolf is your next book boyfriend; Huntyr is your next vampire assassin independent bad-a*s female. Themes include loyalty, trust, self-discovery, a true slow burn romance. Side note: book ends on a angsty cliffhanger!
•
Emily, thank you for writing this awesome novel and I cannot wait to devour Book 2, Blood So Brutal! 😍
•
Happy reading, my lovelies! xo
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Reviewed in the United States on January 21, 2024
★★★★★ 4
“My heart bows to you and you only, Huntress.”
Format: Kindle
3.5 🌟
This book popped up in my KU recommended reading suggestions and the synopsis sounded like what I was in the mood for. I'm so glad I took a chance on it. I went into this knowing absolutely nothing about it and ended up really liking it. I love when this happens.
The main characters are likeable and I easily found myself rooting for them. There is a mystery element to each of their backstories that I enjoyed watching unfold and can't wait to get more of. Wolf, in particular, has me fixated. Love him.
I found this to be an entertaining, addictive read with a plot that moves along at a good pace. It reads so easily I found myself very reluctant to put it down. Lots of twists and turns and the angst is there. A good set up for the next book to come, for sure.
My issues with this book....the dialogue feels a bit juvenile at times and there is a repetitive over use of a particular word phrasing that I found myself giving the ole eye-roll to. There are, without a doubt, some pretty cliche moments that gave me a bit of the cringe. I think this could've certainly 100% benefited from more depth regarding the world building. Perhaps the world building was sacrificed to keep the pacing quick? Just a guess. Also, the lack of consistency of character for the FMC was really evident and so she feels quite illogical at times.
Overall, this was a fun and enjoyable read that hit the spot well enough for me. That ending certainly has me impatiently pining for book 2!
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Reviewed in the United States on June 18, 2024
★★★★★ 3
Interesting take on the genre
Format: Kindle
True rating: 3.25 ⭐️
I enjoyed the fresh take on the genre. The best way I could describe the setting and world is an apocalyptic dystopian version of Farie where vampires, fae, and angles struggle to survive in what is left of the world. It was definitely interesting throwing the academy/hunger games aspect into this world as well.
Even though I guessed the final reveal early on in the book, I kept hoping I was wrong, and it would take a surprising turn. While the "plot twists" were a bit predictable to me, I still enjoyed the ride this book took me on.
Another downfall for me was the plot holes in the world building... I.E. if society has fallen and the world is in the aftermath of war, how are there trains running around the world? Just to take young adults to the trials to get into the golden city? How is the train maintained, the tracks clear, etc?
However, I did enjoy the FMC & MMC and thought they were fleshed out nicely. I also enjoyed the side characters but wish some were developed more like Ashalin (sp?). I do find myself rooting for the MCs to succeed and find happiness together, which is obviously an important aspect for romantasy.
Overall, was this an earth-shattering, mind-bending, terrific piece of literature? No. But was it the worst thing I've read this year? Also, no. This book has, to me, the bones of a great read & just needs a bit more to push it from an alright book to a great book.
Overall ratings:
Plot- 3.5⭐️
World building 3⭐️
Spice 2.5 🌶🌶
Main characters 4 ⭐️
Supporting characters 3.5⭐️
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Reviewed in the United States on May 12, 2024
★★★★★ 5
great book
Format: Kindle
I am really excited to meet the author at the book retreat this month. I really enjoyed this world that she built and most of the female main character Huntress is so awesome. She goes through a lot in this book and the ending; wow! I wouldn't have even guessed. I highly recommend everyone to read this book.
I have been so lucky this year that almost all the books I have read have been, so far, 5 out 5 stars.
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Reviewed in the United States on June 2, 2026
★★★★★ 4
Fallen for the Fallen Angel – A Guilty Pleasure Worth Every Page
Format: Kindle
There’s something deeply irresistible about a dark academia or trial-based setting, a brooding and arrogant fallen angel, and a fierce heroine with enough sass to go toe-to-toe with him. Wings So Wicked is exactly that kind of book—and I devoured it in just a couple of days.
To be fair, the plot isn’t groundbreaking. If you’re looking for something fresh and innovative in terms of storyline, this might not be it. But if your reader heart beats faster at the mere mention of enemies-to-lovers, jealousy-fueled banter, magical trials, betrayals, and forbidden tension—you’ll feel right at home. It’s like catnip for those of us with this particular weakness.
The chemistry between the leads could have used a slightly slower burn to make the tension sizzle longer, but I still found myself completely invested in their dynamic. There are moments and phrases that feel a bit cheesy or underdeveloped, but honestly? I didn’t care. The vibes were exactly what I wanted.
This book isn’t trying to reinvent the genre—it’s here to give readers like me what we crave: high-stakes magical drama, angsty romance, and the thrill of watching a badass girl and her brooding counterpart clash and spark. If that sounds like your kind of story, Wings So Wicked will hit the mark.
Here’s hoping Book 2 turns up the heat and keeps the magic alive.
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Reviewed in the United States on May 20, 2025
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