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A 15-Inch Spec-37 Rotor Ring Cut for the Right-Hand Side
This is Wilwood's SRP drilled and slotted rotor in 15.00 in diameter by 1.25 in width, cast in Spec-37 iron with 72 curved internal vanes and finished in black electro coat. It is the right-hand half of a directional pair and mounts to a Wilwood hat rather than directly to a hub, appearing as the right-hand rotor in kit 140-15025-D.
Key Features
- SRP drilled and slotted design at 15.00 in diameter by 1.25 in width.
- Spec-37 iron casting with 72 curved vanes for internal ventilation.
- Directional cross-drill and face-slot pattern that Wilwood credits with improving response from light through heavy braking.
- The venting and cleaning action of the holes and slots reduces pad glaze and disperses gas and heat at the pad and rotor interface.
- Black electro coat surface finish for corrosion protection.
- Dynamically balanced at the factory and supplied unburnished.
- Right-hand directional part that pairs with the left-hand 160-14636-BK.
Fitment
| Application | Detail |
|---|---|
| Application type | Component rotor for Wilwood hat-mount big brake assemblies |
| Known parent kit | Appears as the right-hand rotor in Wilwood kit 140-15025-D |
| Vehicle fitment | None published standalone; fitment follows the parent kit |
Wilwood does not publish a standalone vehicle application for this rotor, because what determines fitment is the hat, caliper bracket and kit it is being fitted into rather than a vehicle year and model.
Specifications
| Detail | Value |
|---|---|
| Brand | Wilwood |
| MPN | 160-14635-BK |
| Part type | Rotor ring, hat mount |
| Diameter | 15.00 in |
| Width | 1.25 in |
| Mount side | Right hand |
| Material | Spec-37 iron |
| Vane count | 72 curved vane |
| Type | SRP-BLK |
| Style | SRP drilled and slotted |
| Surface finish | Black electro coat |
| Burnished | No |
| Dynamically balanced | Yes |
| Rotor bolt circle | 12 x 8.75 in, taken from the matched left-hand part |
| Rotor mount hole size | 0.251 in, taken from the matched left-hand part |
| Weight | About 23.00 lb, taken from the matched left-hand part |
What's Included
- One Wilwood SRP drilled and slotted rotor, right hand
About Wilwood
Wilwood's SRP line is its street-and-performance rotor range, cast in Spec-37 iron and sold both inside complete kits and as individual replacement rings. The 15.00 in by 1.25 in size with a 12-bolt, 8.75 in mounting circle belongs to the larger hat-mount assemblies, where the ring is a wear item that can be renewed without replacing the hat or the caliper.
FAQ
Is this a 12-inch GT curved vane rotor?No, and earlier listing copy describing it that way was wrong. Wilwood specifies it as an SRP drilled and slotted rotor at 15.00 in diameter by 1.25 in width.
Does the side matter when fitting it?Yes. The drill and slot pattern is directional, so this rotor belongs on the right-hand side and the left-hand side takes 160-14636-BK.
Does it come with a hat?No. One rotor ring is supplied. In kit 140-15025-D the matching hat is Wilwood 170-7467, an aluminium black e-coat hat with 1.750 in offset.
How does it bolt up?Through a twelve-bolt pattern on an 8.75 in circle with 0.251 in mounting holes, based on the matched opposite-hand part.
Why 72 curved vanes rather than straight vanes?Curved vanes pump air through the rotor as it turns, and the high vane count increases the internal surface area available to shed heat.
Is the rotor ready to fit straight from the box?It arrives dynamically balanced but not burnished, so the pads still need a proper bed-in cycle once installed.
What does the black electro coat do?It protects the non-friction surfaces from corrosion. The pad sweep area cleans itself off during the first stops.
Will the drilling weaken the rotor?The holes are cast and machined as part of the SRP design rather than drilled into a plain rotor after the fact, and they exist to vent gas and keep the pad face clean.
How should the brakes be bedded in?Wilwood's procedure runs a series of light decelerations, then medium and firm stops, finishing with eight to ten hard decelerations from 55-65 mph down to 25 mph.
Installation Instructions
- Confirm the assembly this ring is going into uses a 15.00 in by 1.25 in rotor on a twelve-bolt, 8.75 in mounting circle.
- Identify the directional pattern and set the rotor aside for the right-hand side of the vehicle.
- Clean the hat mounting face so the ring seats flat, and inspect the hat for elongated or damaged bolt holes.
- Mount the ring to the hat with the correct Wilwood rotor bolts and tighten them evenly in a cross pattern.
- Check runout at the rotor face once the assembly is on the hub, before the caliper is refitted.
- Refit the caliper and confirm the pads sweep the full friction band without overhanging the edges.
- Bed the brakes in with Wilwood's published cycle, finishing with eight to ten hard decelerations from 55-65 mph to 25 mph.
- Re-check the rotor bolts after the bed-in cycle has cooled.
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