Hub Register
Center bore diameter that locates the rotor hat on the vehicle hub.
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Description
Rotor HatRotor Hats 2 Piece Rotor Hardware Forged 6061 T6 Aluminum Forged Aluminum Rotor Hats TTSPORT forged aluminum rotor hats, also called rotor bells, are the structural link between the brake ring and the vehicle hub in a two piece rotor assembly. Forged 6061 T6 aluminum construction supports a stable mounting interface, accurate hub centering, and serviceable ring replacement when matched to the correct friction ring, hub register, offset, and hardware
Rotor Hats · 2-Piece Rotor Hardware · Forged 6061-T6 Aluminum
Forged Aluminum Rotor Hats
TTSPORT forged aluminum rotor hats, also called rotor bells, are the structural link between the brake ring and the vehicle hub in a two-piece rotor assembly. Forged 6061-T6 aluminum construction supports a stable mounting interface, accurate hub centering, and serviceable ring replacement when matched to the correct friction ring, hub register, offset, and hardware style.
Why a Forged Aluminum Hat Matters
In a two-piece rotor, the hat carries the hub-side mounting load, locates the iron friction ring, and helps separate the hot braking ring from the wheel hub. A correctly machined aluminum hat supports lower runout, more consistent pad contact, and reduced rotational and unsprung mass compared with a comparable one-piece cast-iron rotor assembly.
- Forged 6061-T6 aluminum construction for strength-to-weight performance
- Reduced unsprung and rotational mass when used as part of a complete two-piece rotor assembly
- Thermal separation between the iron friction ring and wheel hub
- CNC-machined hub register and mounting face for accurate rotor location
- Serviceable two-piece design — replace the friction ring without replacing the hat when the hat remains within service limits
Specifications
| Rotor Hat / Bell | |
|---|---|
| Component | Two-piece rotor hat / bell |
| Material | Forged 6061-T6 aluminum |
| Manufacturing Process | Forged blank, CNC-machined to final dimensions |
| Function | Connects the friction ring to the vehicle hub in a two-piece rotor assembly |
| Compatibility | Compatible TTSPORT two-piece brake ring assemblies |
| Hardware Requirement | Must match the ring bolt pattern, bolt count, offset, and fixed or floating hardware style |
| Serviceability | Friction ring can be replaced separately when the hat remains undamaged and within service specification |
| Fitment Requirement | Application-specific; dimensions must be confirmed before ordering |
Spec values reflect general TTSPORT forged rotor hat construction. Exact dimensions are application-specific and confirmed at order.
This product page describes rotor hats only. Friction rings, rotor hat bolts, bobbins, nuts, washers, brake pads, calipers, brake hoses, brake fluid, and complete two-piece rotor assemblies are not included unless separately specified on the final order.
Required Measurements Before Ordering
Rotor hats are application-sensitive. Before ordering — especially when replacing one half of an existing two-piece rotor assembly — confirm the following dimensions with TTSPORT.
Wheel Bolt Pattern
Vehicle PCD and lug count, such as 5×114.3, 5×120, or another application-specific pattern.
Ring Bolt Pattern
Hat-to-ring PCD, bolt count, bolt diameter, and mounting-hole style.
Hat Offset
Axial dimension that sets the friction ring position relative to the hub and caliper centerline.
Ring Diameter & Width
Friction ring outside diameter, overall thickness, and air-gap / vane configuration.
Hardware Style
Fixed bolt mount, floating bobbin hardware, or other application-specific ring mounting style.
Serviceability
Because the hat and ring are separate components, the iron friction ring can be replaced at service intervals while reusing the forged aluminum hat if the hat is undamaged, flat, correctly centered, and still within the required dimensional limits. This can reduce long-term replacement cost compared with replacing a complete one-piece rotor every time.
Fitment Notice
Application-specific part: Rotor hats must be matched to the hub register, wheel bolt pattern, rotor mounting pattern, hat offset, friction ring size, and hardware style of the target assembly. Incorrect specifications can prevent installation or cause rotor misalignment.
Installation & Safety
- Confirm hub register, PCD, hat offset, friction ring bolt pattern, and hardware style before installation.
- Clean the hub face, hat mounting face, and ring mating surface before assembly.
- Use the specified rotor hat hardware only; do not mix unknown bolts, nuts, washers, or bobbins.
- Follow the torque value, tightening sequence, and thread treatment specified for the rotor assembly.
- After assembly, verify rotor runout, caliper centering, pad sweep, and wheel clearance before driving.
- Inspect the hat for cracks, impact damage, worn mounting holes, corrosion, or fretting before reusing it with a new friction ring.
Safety: Two-piece rotor assembly work should be performed by a qualified brake technician. Do not install a rotor hat if fitment dimensions, hardware style, or torque specification are unknown.
Frequently Asked Questions
What is a rotor hat?
A rotor hat, also called a bell, is the inner aluminum section of a two-piece rotor. It connects the iron friction ring to the vehicle hub and sets the rotor's position relative to the caliper.
Why forged 6061-T6 aluminum?
Forged 6061-T6 aluminum offers a strong balance of low weight, strength, machinability, and corrosion resistance. It is suitable for a precision rotor hat when the design, dimensions, and hardware are matched correctly.
Will these hats fit any two-piece rotor?
No. Rotor hats are application-specific. They must match the friction ring bolt pattern, hub register, wheel PCD, hat offset, ring size, and fixed or floating hardware style.
Can I reuse the hat when replacing the ring?
Yes, if the hat is undamaged and still within service limits. Inspect the mounting faces, bolt holes, hub register, offset, and hardware contact areas before reusing it with a new friction ring.
How do I order the correct rotor hat?
Provide hub register, wheel bolt pattern, ring bolt pattern, hat offset, ring diameter, ring width, and fixed-vs-floating hardware style. Contact TTSPORT to confirm before ordering.
Need help confirming rotor hat fitment?
Send your vehicle details, hub register, wheel bolt pattern, ring bolt pattern, hat offset, ring diameter, ring thickness, and hardware style. TTSPORT will help confirm the correct forged aluminum rotor hat for your assembly.
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
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Solid!
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It's a rock-solid receiver with modern and future-proof features. Denon isn't the flashiest or most aesthetically pleasing design; however, the unit is reliable and sounds great. I used Dirac Live to fine tune the system, and it's been a worthwhile upgrade from my X-2700.
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Reviewed in the United States on July 15, 2025
★★★★★ 1
DOA
Style: AVR-X3800H
It was Dead On Arrival. It powered on for a few seconds, then powered off. I sent it back.
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Reviewed in the United States on February 19, 2026
★★★★★ 5
Never would have known it was a refurbished AVR
Style: AVR-X3800H
Unit arrived as in new condition. No flaws and complete.
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Reviewed in the United States on February 13, 2026
★★★★★ 5
Great replacement to my older 5.1 Yamaha receiver.
Style: 7.2 Receiver
Great replacement for an older Yamaha. My previous unit lasted 10 years and I see no reason why this new one wont last another 10. Familiar features and setup to other Yamaha receivers. Zero issues with setup and contrary to others, you can use all the features without the app. While the app does add some features for streaming, the unit is fully usable as a receiver for movies, surround, etc. without the app. Overall the sound improvement is spectacular, the high slew rate really makes a difference and DSP much improved over the older 10 year old unit I had. Solid hardware, solid setup and while I'm not about Brand Loyalty, the Yamaha still had better features, reviews and quality than the other major brands. I would have no issue recommending this to unit to anyone. Remember, these units are about the sound they offer, not the the wiz bang features you see in some other units. Reliable hardware, reliable sound and a rich feature set makes this unit a no brainer.
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Reviewed in the United States on January 1, 2026
★★★★★ 5
Great receiver for money!
Style: 7.2 Receiver
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Great value for the price! Volume is very easy to set!
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Reviewed in the United States on October 15, 2025