Experience the ultimate mountain biking performance with the Strummer HM-650 Boost! With a fast engagement angle of just 3.16°, supported by a 6-pawl mechanism with three teeth on each pawl, it delivers 114 engagement points. Ready to tackle the terrain quickly and confidently!
Made from aerospace-grade aluminum, each Strummer hub is precision-engineered using a combination of AL6061-T6 and AL7075-T6, undergoing precise finishing and anodizing processes to meet our high standards.
Take your mountain biking to the next level with Strummer, hubs designed for speed, performance, and style!
Strummer HM-650 Boost Hub Specifications
Front Hub: 15x110 mm, 14G, 32H, 165 grams
Rear Hub: 12x148 mm, 14G, 32H, Compatible with Microspline 12s, 6 Pawls, 290 grams
Material: AL6061-T6 & AL7075-T6
Freehub Body: Compatible with Shimano Micro Spline 12s
Compatible Spare Parts & Adapters
9x142 mm QR End Cap (ADT-00060BK)
B2B Information (for Dealers)
Contents per box: 20 sets
Rear Hub (Freehub) Maintenance Note
Grease lubricates the moving parts in the freehub mechanism of the rear hub, helping to 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 recommended for product maintenance.
Sales Unit
HM-650 Boost Gen-1 is sold as a pair, consisting of the front and rear hubs; the rear hub is not sold separately.
XC28 27.5-Inch Spoke Length Calculation
Use the Strummer Spoke Calculator: Strummer Spoke Calculator. Select the 27.5-inch XC28 and HM-650 Boost hub, then adjust the rim ERD, hole count, and lacing pattern. Use the calculated result for each wheel and side; do not take spoke lengths from the non-Boost hub version.
24H/28H Centerlock Option
HM-650 Boost Gen-1 is not available in a 24H/28H Centerlock option. To find another suitable model, use the Strummer Hub Selector.
Replacement Bearing Specifications
| Position | Bearing code | Quantity |
|---|---|---|
| Front hub | 18307-2RS | 2 pcs |
| Rear hub | 6902-2RS | 2 pcs |
| Freehub body | 6802-2RS | 2 pcs |
Freehub Conversion and Boost Standard
HM-650 Gen-1, including the Boost variant, can be converted from Microspline to HG MTB by purchasing the Strummer HG MTB 6-Pawl Gen-1 Freehub Body (PARTS-00015), sold separately. Use this freehub body to install compatible HG MTB sprockets. HM-650 Boost Gen-1 does not support a Super Boost configuration. This hub uses the 15×110 mm front and 12×148 mm rear Boost standards.
