The rear Max45 All-Axle motor from Grin has all the features you love about our standard hub, ie a powerful, versatile, lightweight direct drive motor, but now available for a fat bike! As you would expect, this device is compatible with both thru-axle dropouts and quick-release dropouts via swappable inserts.
Features
Compatible with 170mm, 190mm quick-release dropouts
Compatible with 177mm, and 197mm thru-axle dropouts
Integrated torque arm for zero dropout stress
Shimano HG or SRAM XD compatible freehub options
Integrated torque AND 2-wire cadence sensor in freehub body
Statorade compatible for maximum heat dissipation
Lightest direct drive motor in this power class (just 6.2kg!)
Internal 10K NTC thermistor for motor temperature sensing
The Rear Max45 All-Axle motor is available in 2 different winding speeds; a slow 7.2 rpm/V option and a standard 9 rpm/V model. If sustained torque is the main objective, then we recommend the slower motor winding and a 52V or higher battery pack since the maximum phase current of the Baserunner/Phaserunner motor controllers will otherwise be the limiting factor in how much power you get.
There are three cassette driver options for each winding. The PAS-only Shimano cassette is the lowest cost option for those who don't need a built-in torque sensor. For those wanting a torque sensor, both a Shimano HG and a higher end SRAM-XDR driver option are available. The SRAM-XD is used in 1x12 drivetrains with small 9 or 10 tooth cogs for better pedaling at high speeds. The axle adapters sets are available for conventional slotted dropouts and for 12mm thru-axle dropouts, for both ~170mm (4" tire) and ~190mm (5" tire) frame standards.
PAS Only Rear Max45 All-Axle Hub Motor for Fatbikes. Slow 5 turn (~7.2 rpm/V) Winding. SRAM XDR Freehub.
You can get a bare hub and lace it into a suitable 32 hole rim yourself, or choose to get a professional wheel build done here at Grin using our stock rim selections and quality Sapim butted spokes. Our head wheel builder Robert has decades of experience and is renowned for building wheels that are nearly bombproof.
If you want Grin to do the wheelbuild, be sure to select either the Silver or Black spoke option from the dropdown menu, along with your preferred rim. By default all wheels will be be dished with the rim dead center between the dropouts, if you require some special dishing offset for an oddball frame please mention that in the order comments.
If you are doing your own wheel build into your own rim, be sure to specify the required spoke length in the order comments to match your selected rim ERD and lacing pattern. If you require a wider rim than the ones we carry, you're welcome to source your own 32 hole fatbike rim and send it to us for your wheel build. Please get in touch with us to get an RMA # for the rim shipment.
20 Inch, 32 Hole, 65mm Wide Weinmann Double Walled Rim, for Fat Bike Tires.
1m Long Extension Cable with 6 Pin HiGo MiniB Compatible Connectors, for Optional use with Baserunner V4
Click Here for detailed product info page
- Out of Stock -
Laser Engrave 250 Watt Continuous Power Rating on Motor Side Plate. This is Truthful. ALL Hub Motors Offered by Grin Have an Operating Point (RPM and Allowable Temperature) Where They Can Only Sustain 250W.
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