eZee Kits

Page Last Modified On: September 1, 2026

ezee kit

Introduction

The eZee is a light, well-engineered geared hub motor kit: high torque, quiet running, and full compatibility with North American bicycle standards.

Since Grin started selling eZee kits in 2007, this company has tended to understand western expectations for quality and product support. We have worked with eZee to tailor a version of this kit to match our own product line, including the Cycle Analyst port on the motor controller, universal battery voltage compatibility, interchangeable throttle standards, a rear wheel option, and a high RPM 20" version. With the choice of either front or rear hubs and full disc brake compatibility, there is an eZee kit suitable for just about every model and style of bicycle or tricycle out there.

In our current lineup it is a specialist pick rather than our most popular kit. A geared hub freewheels, so it cannot do regenerative braking, and regen is something many riders now want, so most of our customers choose our in-house All-Axle direct drive instead, which adds regen and does it well. The eZee still earns its place when low weight and a traditional freewheeling geared hub matter most to you: a proven, quiet climber with a long track record.

Ready to build with an eZee? Get it as a complete eZee kit, or as a stand-alone hub.

What's Included

The stock eZee kit includes the base items required to convert a bicycle to have electric assist.

500 watt internally geared eZee brushless hub motor laced in a double walled rim
Schwalbe Marathon puncture resistant tire and inner tube
A 25 amp (IRFB4110 mosfet) motor controller
Your choice of a thumb, twist, or half twist throttle
An assortment of cable ties, controller mounting bracket and a connector housing
Two-piece Torque Arm, for those who want extra security against axle spinout

Plus, you have the option of getting the following accessories:

Direct Plug-in Cycle Analyst, to display information about the battery and performance of the vehicle
Pedal Assist (PAS) magnet ring sensor, or full torque sensing bottom brackets
Ebrake Levers, causes the power to shut off as soon as the brakes are squeezed
A 36V or 48V battery pack to power the kit (any pack rated for 25A continuous works)

Battery Options

The eZee kit runs on any 36V or 48V battery pack that can deliver 25A of continuous current. Since the eZee controller has no ON/OFF switch of its own, we recommend a pack that has its own switch. Browse our current packs and chargers on the battery options guide.

eZee Accessories

Throttle Type

The standard kit includes a full-length twist throttle, which works well with thumb lever shifters. If you have twist shifters, then you may want to consider either a thumb throttle or a left-side twist throttle, which we can substitute in place of the twist throttle at no charge.

Cycle Analyst Upgrade

The kit comes with a handlebar-mounted 3-LED battery level indicator. The Cycle Analyst upgrade provides a display console with precise information on speed, power usage, and efficiency, and it also gives the advantage of programmable current, voltage, and speed-limiting features. Read more about the Cycle Analyst.

Freewheel Choice (rear only)

The rear wheel kits are supplied by default with a 7 speed 11-32 tooth freewheel, which fits fine on the eZee hub inside the standard 135mm rear dropout width. There is the option of getting an 8 or 9 speed freewheel instead, but because these are wider a spacer washer is required that extends the axle length to 138mm so that the small gear does not rub against the frame.

Specifications and Installation Manual

Mechanical Dimensions of the Front eZee Hub

Mechanical Dimensions of the Rear eZee Hub

eZee Controller Installation and User Guide

We still have available the original install guide for the eZee hub motor system that was written for the 2007 version of this kit.

Specifications

Controller Specs
Max Voltage:	60V
Low Voltage Cutoff:	29V
Current Limit:	25A
Throttle Type:	Hall Effect, 1-4V
Dimensions:	115 x 70 x 40mm
Weight:	0.35 kg

Motor Specs
26"/700c Kv:	7.2 RPM/V
20" motor Kv:	9.1 RPM/V
Power at 36V:	550W
Power at 48V:	750W
Weight:	3.8kg

Highlights

Geared Drive

The 5:1 planetary gear drive in the eZee hub motor makes it possible to have a high torque output without all the bulk and weight of a direct drive machine. The eZee motor weighs just 3.8kg compared to 6kg for a comparable 400 series Crystalyte motor. Both the sun and ring gears are steel. The planetary gears are a machined (not cast) nylon, and easily replaceable should they ever wear out.

0.35mm Laminations

The motor core has been upgraded to use 0.35mm thick stator laminations, giving higher peak efficiency and lower no-load losses than other comparable geared hub motors in this power class.

Freewheel

As with most geared hub motors, the hub itself can spin freely in the forwards direction without any motor drag. With no cogging torque, you can rest assured that the presence of the hub won't interfere with the rideability of the bike when you aren't using electric assistance. It spins freely just like a regular bike wheel.

Rim, tube, and tire

The hub motor is pre-built in a black alloy double-walled eyelet rim, with quality 13 gauge stainless spokes, and a pre-inflated tube and puncture-resistant Schwalbe tire to boot. All that is required for installation is removing the original front wheel, replacing it with the eZee wheel, and connecting the wires.

ezee tire

Water Resistance

From our perspective, one of the nicest details of this kit is the considerable attention that eZee has put into keeping water from damaging any part of this rig. The motor cables are completely sealed where they come out of a hollow in the centre of the axle. The motor controllers have an o-ring seal around the lid and a fully conformal coated circuitboard.

However, water can get into the controller housing by tracking along inside the wire sheath, and if the insides of the controller stay pooled up with water then erratic behavior will result. So it is very important to install the controller with the wires exiting at a downwards angle so that they don't funnel water into the casing. If the particular cable arrangement doesn't allow this, then you can also drill holes through the enclosure casing at the lowest point in your installation so that any water that gets in will drip out.

Cycle Analyst Compatibility

Our eZee motor controllers are compatible with our Direct Plug-in (CA-DPS) Cycle Analyst device and include a label with the exact RShunt value for calibration. The 6-pin connector on the controller plugs into the supplied 3-LED battery indicator by default, but if the Cycle Analyst upgrade is purchased for the kit then the CA can plug in here instead. This adds a range of additional functionality such as programmable low-voltage cutout, speed and current limiting, and precise, quantitative battery pack monitoring.

Speed

At 36V, the eZee kits can easily maintain the legal ebike speed limit of 32kph (20mph) while still outputting an appreciable 200-300 watts of power. Up hills, the speed will slow down until the motor is supplying sufficient torque to overcome the load. For exact details please see our motor simulator. The 20" eZee kits have the motor wound for a higher RPM, so that the speed on the road is roughly the same as with the 26" kit.
For people who require faster speeds than this, there are two options. One is to use a 48V battery pack. The other option is to start with a high rpm 20" wheel kit and re-lace it into either a 26" or 700c rim. With this latter approach you can achieve 40kph speeds while staying with a 36V battery, which provides many more off the shelf battery choices.

Disk Brake

Both the front and rear eZee hubs have an integrated 6-hole ISO disk mount to accommodate disk brakes on the left side. The narrow design of the hub allows sufficient space for most calipers to be mounted without clearance issues against the side of the motor.

48V Operation

Our eZee controllers are custom made with IRFB4110 mosfets so that they run cooler and handle 48V packs without issue. So for those wanting additional speed and power from their eZee hub, there is the opportunity to simply run the system as-is but with a 48V battery. Note that this is one of our own customizations, and stock eZee controllers and kits sourced through other distributors do not have 48V compliance.

Drawbacks

There are a few reasons why the eZee geared hub motors might not be ideal for your application, and a direct drive motor could be more suitable instead.

No regenerative braking	Gear Noise	Less Opportunity to Overload
As with any freewheeling setup, it is not possible to use the hub for regenerative braking even if combined with a regen motor controller.	Compared to other geared drive systems, the eZee motor, with its nylon planet gears, is relatively quiet; the faint buzz of the gearing is dwarfed by traffic noise. However, for absolute silence nothing compares to the direct-drive motors.	Since the eZee motor is smaller and being run at its optimum power and RPM level, it is not as tolerant to being pushed beyond the specified design parameters as the larger direct drive hubs. Warranty is voided on the eZee motor if the input power to the hub exceeds 1000 watts.

Frequently Asked Questions

Can you install it for me?

ezee install

Yes, we do kit installations at our shop in Vancouver. That said, we recommend that anyone comfortable doing so follow our install guide and do it themselves: you end up intimately familiar with how the system goes together and far better equipped to troubleshoot down the road. Some local bike shops also offer installation, so it is worth asking around in your area.

Can you ship it to location X?

Yes. We have shipped eZee kits across North America, Europe, and Australia/New Zealand, and to most countries worldwide. Exact shipping options and quotes are calculated for your address during checkout.

Do you sell or service eZee bicycles, like the Forza, Sprint, etc.?

No, we deal exclusively with conversion kits, not their full bicycles. For eZee bicycles and their dealers, have a look at the eZee bike website.

Can I get just the hub?

Yes, we offer a number of unlaced front eZee hubs, both in the standard and the high rpm (20" wheel) wind version. These hubs are a special run we had made with 144 spoke holes, which enables easy lacing in both 36 and 48 hole rims, as well as 32 hole rims by alternating between every 4th and 5th hole in the flange.

Can I get it with another battery?

Yes, it is easy to run the kit with just about any 3rd party 36V or 48V battery pack provided that it can deliver at least 20 amps of continuous current. At one time we offered a package deal with a less expensive NiCd pack, but at the moment we only have the two high-end lithium options listed above. In general, when running off a 36V battery you can expect about 3-4 km of range for each amp-hour of capacity.

Will it work with other controllers?

Yes, the eZee hub can be driven by most 3-phase brushless motor controllers that use 120 degree hall timing. Notice though that some controllers will spin the internal motor backwards, which will result in the wheel not spinning at all. Our own controllers include a FWD/REV direction control that ensures compatibility.

What if I don't have disk brakes on my fork?

Use conventional rim brakes on your bike, but be sure to install the screws and washers in the disk mounting holes to keep water out of the hub motor.

Do I need special disk calipers?

The eZee hub motor was engineered so that there is around 18 mm between the rotor and the side cover of the motor. If your existing caliper can fit in this space, then it should work just fine. If not, we do sell the Shimano BR-M545 which has a narrow profile and easily fits in the space provided. This caliper is supplied with the correct adapter for a 180mm rotor. If you want to use your existing caliper but it is spaced for either a 160mm or a 203mm rotor, then you would need to either replace the included 180mm unit with the appropriate sized disk, or get the standoff spacer for your caliper so that it accommodates 180mm.

Can I run it at 72V, or with a higher current controller, in order to get more torque?

We do not recommend running the eZee hub motors with more than 48V or more than a 25A motor controller. At higher power levels, there is a chance of either melting the insulation on the lead wires that go into the hub, or of rapidly wearing down the internal gears.

How long do the gears actually last? Will they need replacement?

Our early concerns about gear longevity have been laid to rest by experience. Across the many years we have sold eZee motors, gearing related failures have been rare, well under 2%. Opening up and replacing the insides of the eZee motor is very straightforward if servicing is required, and we do carry replacement gears and freewheeling clutch assemblies just in case.

Why an open kit instead of a closed, proprietary system?

The eZee is an open system: you can swap in different battery packs to suit your range and speed, and upgrade to third-party controllers, throttles, and displays as your needs change. A proprietary system does the opposite. Its parts are locked to one another, so you can only ever run that one company's batteries and components, and the whole bike is only as supportable as the company standing behind it.

We have watched that play out. Proprietary players like BionX came and went, and when the company folded its owners were left with a bike they could no longer service or upgrade. An open kit can well outlive the company that made it, which is exactly why we build them this way. There is more on this trade-off in our guide to kits vs. turnkey ebikes.

Keep Exploring

The eZee is one of several kits we build. Compare it against the rest in our hub motor options guide, take a look at our flagship All-Axle kits, or configure a complete build in the Kit Builder.