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Description
Boom Racing Complete Front Assembled BRX90 Portal PHAT™ AxlePRODUCT RESOURCES Instruction Manual Complete Front Assembled Portal Axle For BRX70 & BRX90 BRPT7023_BRPT9023_20231021_1697858930_1705044485. Pdf 7. 51 MB TAGGED CATEGORIES: AXLE & ACCESSORIES PRODUCT INFORMATION: This is a complete front assembled BRX90 portal PHAT axle set. This is a high performance, heavy duty axle designed for scale truck project builds. The modular design makes it suitable for different project builds, and the width of the BRX90
PRODUCT RESOURCES
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This is a complete front assembled BRX90 portal PHAT™ axle set.
This is a high-performance, heavy-duty axle designed for scale truck project builds. The modular design makes it suitable for different project builds, and the width of the BRX90 axle makes it perfect for any standard 1/10 project rigs.
Packed with many desirable features; a heavy-weighted cast alloy axle housing for low CG, link setup or leaf spring over and under axle setup, chassis-mounted or servo-on-axle setup, front tie-rod or behind-the-axle steering setup, detachable aluminum CNC truss, adjustable caster angle, and more.
It uses top-quality drivetrain components that are heavy-duty and efficient, including a set of heavy-duty steel triangular keyed AR44 axle gears (30/8T) and a pair of BADASS™ steel universal drive shafts for ultimate strength, performance, and durability.
The portal gearbox is designed with four heavy-duty steel gears each for strength and durability. The portal spindle rotates in the same direction as the driveshafts; the axle can fit directly into many standard drivetrain setups without changing the rotational direction of the drivelines.
Includes black color XT diff cover and black color third member unit (fits Reverse AR44 Helical Cut Bevel Gear for running Counter Rotating Center Drive Shafts usually used in the rear axle).
Specification:- Width: 188.3mm / 7.41" pin-to-pin (BRX90 portal front and rear axles have the same widths)
- Requires 44mm / 1.73" wheel barrel clearance (to clear the entire portal gearbox)
- Portal gearbox ratio: 1:1
- Weight: 321.8g
- Portal Gearbox Size:
- Width: 23.5mm
- Height: 30.5mm (21.5mm above shaft / 9mm below)
Features:- Additional 15mm / 0.59" ground clearance at the pumpkin over BRX90 straight axle
- CNC aluminum portal knuckle & cover
- BADASS™ heavy-duty steel front universal driveshafts and portal driveshafts for ultimate durability, performance, and strength for the axle drivetrain
- Four heavy-duty hardened steel metal gears in each portal gearbox for ultimate durability, plus easy to set up to standard drivetrains
- Cast PHAT™ axle housing - strong, durable, and heavy which keeps the CG low
- Anti-twist steel brackets (0 deg) for added axle strength (optional 10 deg +ve caster available)
- Reversible ring gear position in the housing and optional reversed AR44 gear for counter-rotating center drivetrain setup
- Triangular keyed AR44 (30/8T) high pinion gear & input shaft (optional overdrive and underdrive gears available)
- Chassis Mounted Servo (CMS) and servo-on-axle setup
- CNC aluminum truss included for 3-Link and 4-Link setup
- Detachable knuckle lever for front tie-rod or behind-the-axle steering setup
- Leaf spring over and under the axle housing
- Compatible with PHAT™ axle brake disc and caliper (requires optional adapter #BRPT005)
- Adjustable caster angle for additional steering adjustability (requires 10 deg anti-twist steel brackets #BRPT004+10)
- High steering angle - over 45 degrees
- Removable third member for 6x6 / 8x8 pass-thru option
- Third member high pinion angle for better clearance
- Counter rotation stainless steel steering link for quick adjustments
- Full rubber sealed bearings
- Full 12.9-grade hardware
Includes:
- 2x CNC Aluminum Portal Knuckle #BRPT002
- 2x CNC Aluminum Portal Cover #BRPT003
- 2x BADASS Universal Portal Driveshaft #BRPT9022A
- 2x BADASS Portal Shaft Spindle #BRPT007
- 4x Hardened Steel Gear 20T #BRPT008
- 4x Hardened Steel Gear 16T #BRPT008
- 2x Anti-Twist (0 Deg) Steel Bracket (Left & Right) #BRPT004
- 1x Cast Alloy PHAT Axle Housing #BRLC7024
- 1x Cast Alloy XT Pumpkin Diff Cover #BRLC7088
- 1x AR44 30/8T Triangular Keyed Hardened Steel Gear Set (Ring/Pinion Gear + Spool) #BR955020
- 2x CNC Aluminum C-Hub (Left & Right) #BRD9011
- 2x CNC Aluminum Knuckle Arm (Left & Right) #BRLC7002ARM
- 1x CNC Aluminum Truss #BRLC7004
- 2x CNC Aluminum Link Mount #BRLC7005
- 1x Stainless Steel Tie Rod #BRLC7003
- 1x Stainless Steel Adjustable Steering Link #BRLC7050
- 4x KUDU Nylon Rod Ends #BRW750306A (18.5mm)
- 4x Stainless Steel Pivot Balls #BRW750300
- 4x Brass Bushing #BRLC7022A
- 1x M3 Nyloc #BRASNUTM3
- 2x M2.5 Nut #BRASNUTM25
- 22x Full Rubber Ball Bearings
- 4x Washer
- 5x Spacer D5X8X0.1 #BRASSPD5801
- 2x E-Clip #BRASEC30
- Full 12.9 Grade Screws
You will need:- For Axle Mounted Servo setup, the optional aluminum servo mount is needed.
- For the Chassis Mounted Servo setup, a panhard link is needed (as almost every car has a different setup, we leave this part up to you).
- For Leaf Spring setup, leaf spring channel may or may not be needed depending on your setup. Leafs can be mounted directly on top and under the axle.
When you receive the axle:
Make sure to grease up the axle set. You can fill up the empty space with diff grease surrounding the bevel gear and input shaft.
The gear positions are factory setup and should be ready to go. Rotate the drivetrain by hand for physical inspection.
Install spacers accordingly between the center driveshaft and the input shaft to prevent input shaft from unnecessary slop.
To setup this BRX70 front axle similar to the BRX01 stock axles, these two parts are:- Steel Leaf Spring Channel w/ Shock Mount for BRX70/BRX80/BRX90 Axle (2) BRLC7010
- Aluminum Knuckle Arm (Low Profile) for BRX70/BRX80/BRX90 Knuckle (2) BRLC7002/B
Optional Parts:- Front Skid Plate for BRX70/BRX80/BRX90 PHAT™ Axle BRLC7086F
- Classic Diff Cover for BRX70/BRX80/BRX90 PHAT™ Axle Black BRLC7026
- Behind-the-axle setup requires: #BRLC7002/A / #BRLC7002/B / #BRLC7010 / #BRASSPD427/N
- Anti-Twist (10 Deg Positive Caster) Steel Bracket (Left & Right) #BRPT004+10
Replacement Parts:- Brass bushings: BRLC7022A
- Color: Black
- Package total weight: 382.00 grams (incl. packaging)
- Package size: 9.00 x 24.00 x 8.00cm
- Factory description: Boom Racing Complete Front Assembled Portal Axle for BRX90
- Manufactured by Boom Racing
- Manufacturer number: BRPT9022
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 ★★★★★
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Product Reviews
★★★★★ 5
Comfortable Ergonomic Chair for Long Workdays
Color: Black, Color: Black
I’ve been using this chair for my home office, and it’s been a great addition to my workspace. The seat cushion is thick and comfortable, even after several hours of sitting, and the mesh back keeps good airflow throughout the day. I especially like the adjustable headrest, which provides extra neck support when leaning back during breaks. Assembly was straightforward, the chair feels sturdy, and the wheels roll smoothly on my floor. The all-black design also gives it a professional look that fits well in any office setup. Overall, it’s a comfortable and affordable ergonomic chair that offers excellent value for the price.
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Reviewed in the United States on May 28, 2026
★★★★★ 3
Sturdy but uncomfortable
Color: Black
The seat itself is sturdy and easy to put together, I’ve now had the product for 8 months and had no issues wear/tear despite nearly daily use, but… it’s not comfy, at all. The seat cushion has a texture to it that scrapes at my legs if I don’t have an extra pillow on it or am wearing shorts. Additionally, the seat pillow is just kind of hard. It doesn’t give very much at all, so if I sit on it for more than an hour or two at a time my butt starts to get really sore. It works as a budget option, but invest in a good seat pillow if you plan to sit in it for any length of time.
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Reviewed in the United States on April 29, 2026
★★★★★ 5
A chair that does the job
Color: Black, Color: Black
I’m really happy with this chair overall. I wanted something comfortable, sturdy, breathable, and spacious enough for long hours at my desk when I work from home, and this chair delivered. I’d easily give this chair five stars because it exceeded my expectations in comfort, quality, and overall value.
Comfort and Support
The mesh back keeps it cool and comfortable during extended use. One of my favorite features is the adjustable lumbar support. You can manually position it exactly where your lower back needs support, and it fits the curve of my back perfectly. It provides great support without feeling too firm or uncomfortable.
Build Quality and Design
The chair itself feels solid and well-built. It doesn’t creak or make noise when shifting around, which makes it feel stable and high-quality. The seat is roomy and comfortable, and the overall design looks clean and modern.
Easy Assembly
It also came with an instruction manual that was extremely simple to follow, and assembly was very easy. I was able to put the chair together by myself in about 20 minutes without any help.
Armrest Functionality
I also like the armrests. They aren’t adjustable by height, but they do flip all the way up, which is surprisingly convenient. You can easily slide the chair under a desk or use it as an armless chair when needed.
Packaging and Presentation
Another thing worth mentioning is the packaging. Everything arrived extremely well-packed. Every individual part of the chair was wrapped securely, including bubble wrap protection for the components. The hardware and accessories were neatly organized, and the chair even came with the necessary tools for assembly in case you don’t own a drill or tool set. The presentation and packaging were excellent and showed real attention to detail.
Overall Impression
Overall, this is a fantastic office chair for the price: comfortable, supportive, sturdy, easy to assemble, and packaged exceptionally well. I’d absolutely recommend it and would confidently give it a five-star rating.
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Reviewed in the United States on May 23, 2026
★★★★★ 5
Solid quality and comfortable
Color: Light Grey, Color: Light Grey
Wonderful quality chair, solid and sturdy, it was easy to put together, the directions were very clear and all the pieces fit together perfectly without issue. It is made of breathable material and I love that the arms flip up easily. You can raise it up or down and it has an adjustable headrest. It also has adjustable lumber support. It rolls easily and the color is the only reason I might return, I think I want a different one instead. The chair is comfortable for a petite person but equally comfortable for a tall person. We have both in our family and it is great for both. The armrests are comfortable and there is really nothing negative to say about this chair at all. Considering the quality, it is a great value for the money.
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Reviewed in the United States on April 15, 2026
★★★★★ 5
Comfortable and Sturdy Office Chair
Color: Black, Color: Black
I’ve been very happy with this chair so far. The quality feels solid, and the materials look durable. The color matches the listing perfectly and fits nicely with my office setup. It’s very comfortable for long periods of sitting, with good support for my back and shoulders.
Assembly was straightforward, and all the parts were included. The chair looks modern and professional, and the overall appearance exceeded my expectations. It feels stable and secure, even when reclining or moving around. The wheels roll smoothly, and the chair is easy to adjust for a comfortable fit.
Overall, this is a well-made, comfortable, and attractive office chair that offers great value for the price.
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Reviewed in the United States on June 6, 2026