Strummer HR-360 Ratchet Gen-2 is a hub for road disc and gravel bikes with a Centerlock rotor mount. The 54T ratchet mechanism provides an engagement angle of approximately 6.7°, with an optional 60T ratchet upgrade for a 6° engagement angle.
Product specifications
| Specification | Details |
|---|---|
| Front hub | 12×100 mm thru axle; 130 g |
| Rear hub | 12×142 mm thru axle; 242 g |
| Material | AL6061-T6 body; AL7075-T6 axle |
| Mechanism | 54T ratchet; optional 60T upgrade |
| Engagement angle | Approximately 6.7° (54T) / 6° (60T) |
| Included freehub body | HG Road; supports HG Road 12-speed cassettes |
| Rotor mount | Centerlock |
| Spokes | 14G round and aero (bladed) spokes |
| Bearings | 2 sealed bearings in the front hub; 4 in the rear hub, including the freehub body |
| Hole options | 24H, 28H, and 32H depending on the front or rear variant |
Select the appropriate front or rear variant and hole count. The hub hole count must match the rim; a 36H variant is not currently available.
Axle adapters and conversion
The following adapters are compatible with the HR-360 Ratchet Gen-2 and are sold separately. Select one based on the bike's fork and frame standards.
| Target position / configuration | Adapter to use | Details |
|---|---|---|
| Front QR 9×100 mm |
Universal Hub Adaptor 12×100 to 9×100 SKU: ADT-00085BK |
Converts a 12×100 mm front thru-axle hub to QR 9×100 mm; width remains 100 mm. |
| Rear QR 10×142 mm |
Universal Hub Adaptor 12×142 to 10×142 SKU: ADT-00086BK |
Converts a 12×142 mm rear thru-axle hub to QR 10×142 mm; width remains 142 mm. It does not convert the width to 135 mm. |
| Rear QR 10×135 mm |
End Cap Hub Strummer 10×135 for HR-360 Gen-2 SKU: ADT-00087BK |
End cap specifically for a rear QR 10×135 mm configuration. Use the Gen-2 version; the HR-360 Gen-1 end cap (ADT-00057BK) is not compatible. |
For bikes with a 100 mm front QR and 135 mm rear QR, use ADT-00085BK at the front and ADT-00087BK at the rear. A Microspline configuration with a 135 mm QR is not currently available.
Rotor and cassette compatibility
- Centerlock rotors mount directly to the included mount. The hub supports both internal and external Centerlock lockrings; use the appropriate tool for the lockring type.
- 6-bolt rotors require a suitable 6-bolt rotor mounting adapter for a Centerlock hub, sold separately.
- For HG Road 12-speed cassettes, make sure the cassette body uses the HG Road standard.
- A compatible Microspline freehub body is available separately. Select a supported axle configuration.
Bike fitment guide
- Polygon Tambora G4: Match the 12×100 mm front and 12×142 mm rear axles, as well as the rim hole count. A 6-bolt rotor requires a suitable adapter or rotor replacement.
- Polygon Urbano 5 and Strattos S5 Disc 2020: If the unit uses a 100 mm front QR and 135 mm rear QR, use the ADT-00085BK front adapter and ADT-00087BK rear end cap.
Check the axle standard, dropout width, rotor, cassette, and hole count on the bike before installation. Use the Strummer Hub Selector to help choose a hub. To calculate spoke length, use the Strummer Spoke Calculator and select the appropriate hub generation.
Replacement bearings
| Position | Bearing code | Quantity |
|---|---|---|
| Front hub | Not confirmed | Not confirmed |
| Rear hub | 6902-2RS | 2 pcs |
| Freehub body | 15267-2RS | 2 pcs |
Match the code, dimensions, and seals with the old bearings before purchasing. In addition to steel, hybrid ceramic can be an upgrade option if the type and size are suitable.
Freehub maintenance
Use the type and amount of grease recommended in the product maintenance instructions to lubricate the freehub mechanism and help reduce friction and wear. Do not remove all the grease just to achieve a louder sound, as the components may wear out or become damaged more quickly.
B2B information (for dealers)
Pack quantity: 20 sets per carton.
