Compatibility note: The HG MTB freehub on this hub is not compatible with an HG Road 12-speed cassette because the HG MTB freehub body is shorter.
QR 9×100 / 10×135 mm – 114 POE
The Strummer HM-350 Gen-2 is an MTB hub with the standard 9×100 mm Quick Release front and 10×135 mm rear. This hub uses a 114 POE engagement system with a 6-pawl, 3-tooth mechanism, providing a fast and direct pedaling response.
Compared with the HM-350 Gen-1, the Gen-2 version has wider pawls, providing a larger engagement contact area and stronger construction. Its internal system is also designed with lower rolling resistance, making the hub feel lighter while coasting and more efficient when the bike is moving without pedaling.
The hub body uses AL6061-T6, while the axle uses AL7075-T6 to balance strength, weight, and durability. This hub uses a 6-bolt disc brake system and is compatible with HG-MTB cassettes.
Product Specifications
| Category | Details |
|---|---|
| Model | Strummer HM-350 Gen-2 |
| Front Hub | QR 9×100 mm |
| Rear Hub | QR 10×135 mm |
| Hole Count | 32H |
| Spoke | 14G |
| Cassette | HG-MTB Compatible |
| Brake | 6-Bolt Disc Brake |
| Body Material | AL6061-T6 |
| Axle Material | AL7075-T6 |
| Bearing | Sealed Bearing |
| Front Bearings | 2 pcs |
| Rear Bearings | 4 pcs |
| Front Hub Weight | 155 grams (Without QR Skewer) |
| Rear Hub Weight | 286 grams (Without QR Skewer) |
| Quick Release | Included |
Gen-2 Advantages
- Wider pawls than Gen-1 for a larger engagement contact area and stronger construction.
- Lower rolling resistance, making coasting feel lighter and more efficient.
-
HM-350 Gen-1 end caps remain compatible with HM-350 Gen-2, provided their dimensions match.
- Supporting spare parts are available separately for long-term servicing needs.
Spare Parts & Accessories
End caps, bearings, and supporting components are sold separately. This section can be used to list replacement product SKUs or additional accessories.
Front Hub End Caps
| Product Name | Standard | SKU |
|---|---|---|
| HM-350 Front Hub End Cap | QR 9×100 mm | ADT-00059BK |
| HM-350 Front Hub End Cap | TA 12×100 mm | ADT-00043BK |
| HM-350 Front Hub End Cap | TA 15×100 mm | ADT-00049BK |
Rear Hub End Caps
| Product Name | Standard | SKU |
|---|---|---|
| HM-350 Rear Hub End Cap | QR 10×135 mm | ADT-00044BK |
| HM-350 Rear Hub End Cap | QR 10×142 mm | ADT-00033BK |
| HM-350 Rear Hub End Cap | TA 12×142 mm | ADT-00045BK |
Bearing
| Position | Bearing Type | Dimensions (ID × OD × Thickness) | Quantity | Steel (SKU) | Hybrid Ceramic (SKU) |
|---|---|---|---|---|---|
| Front Hub | 18307-2RS | 18 × 30 × 7 mm | 2 pcs | LAHAR-00013 | LAHAR-00015 |
| Rear Hub | 6902-2RS | 15 × 28 × 7 mm | 2 pcs | LAHAR-00011 | LAHAR-00017 |
| Freehub Body | 6902-2RS | 15 × 28 × 7 mm | 2 pcs | LAHAR-00011 | LAHAR-00017 |
Match the code, dimensions, and seals with the old bearing before purchasing. Hybrid Ceramic is an upgrade option if the type and size are suitable.
Other Components
| Product Name | Description | SKU |
|---|---|---|
| Quick Release Skewer - Front | Front QR Assembly | ASQR-00005BK |
| Quick Release Skewer - Rear (for 135) | Rear QR Assembly | ASQR-00006BK |
B2B Information (for Dealers)
Quantity per box: 20 sets
Rear Hub Maintenance Note (Freehub)
Grease lubricates the surfaces that rub against each other in the rear hub's freehub mechanism, helping reduce friction and wear. Removing all the grease solely to obtain a louder sound is not recommended. Without adequate lubrication, components may wear out or become damaged more quickly, shortening their service life. Use the type and amount of lubricant specified in the product maintenance recommendations.
Use with the United Miami 4.0
Compatible if the bicycle uses a 9×100 mm QR front and 10×135 mm QR rear, a 6-bolt rotor, an HG MTB cassette, and a 32H rim. Check the bicycle component standards before purchasing; if anything is unclear, ask your nearest dealer for assistance.
Clovis 6.10 with Deore 12-Speed
The HM-350 Gen-2 uses an HG MTB freehub. For the Clovis 6.10 with Deore 12-speed, check the cassette standard first: a Microspline cassette cannot be installed directly on an HG MTB freehub. Also match the front/rear axle sizes, rotor mount, and rim hole count before purchasing.
Cross-Generation Freehub Bodies
Not compatible. The HM-350 Gen-2 freehub body differs from the HM-380 Gen-1. Use a replacement freehub body that matches the hub model and generation.
QR and OLD Dimensions
The approximately 5.2 mm dimension is the hole for the QR skewer. The 9 mm front and 10 mm rear figures are the axle seat diameters at the dropouts. The 100 mm and 135 mm figures are the hub widths (OLD).
