4000W Hub Motor Complete Kit

Weight: 36.00 LBS
Height: 24.00 Inches
Width: 24.00 Inches
Depth: 8.00 Inches
Stock: 0
Shipping Cost: Calculated at Checkout

The wind rushes through your hair as you accelerate in silence past ordinary bikers. The crisp smell of the mountain air is all you think about as you use your new freedom bike to propel you to your destination. No sweat No hills to worry about just plain old fashioned fun! Bring a smile to your face with our 4000W gearless hub motor kit! The 4000W version really kicks the fun and acceleration up a notch.  We would venture to say this is the point where true high performance really begins!  This 4000W system offers great hill climbing performance with either motor option.  Conquer hills and terrain with confidence with this awesome 74V performance system.

At the heart of this kit is the custom HPC air cooled brushless motor.  New for 2017, this motor now features an aluminum stator for better heat transfer and increased corrosion resistance.  Not only that, but we were able to put in even higher grade laminations that allow for less cogging torque, easier pedaling, and 3-4% higher peak efficiency over last years motors! This gearless powerhouse of a motor also has extra robust 14mm axles to handle offroad abuse. We offer both a high torque version (Striker) and high speed version (Thunderbolt).  See the table at the bottom of this page to compare motor systems and power levels.

This is a complete kit and includes everything you need to convert your bike into a fully functioning, high power e-bike!

Choosing a Power Package- Higher Wattage (W) means more power! The 2000W system utilizes a 52v battery system that can provide over 2.5 hp and can handle relatively steep grades.  The 3000W and 4000W systems have over 4 and 5 hp respectively and the NEW 5000W system features a brand new wider stator with 5mm wider neodymium magnets and stator can deliver OVER 6.7 hp! ALL SYSTEMS ARE FOR OFFROAD USE ONLY ABOVE 750W! Please check your local laws and regulations.  We can offer kits well over 5,000W but you will have to call us to discuss your specific build! Standard bike frames will not hold up past 5,000W!

Choosing a Battery- New batteries from HPC are a special Lithium based tri-metal blend of Nickel Manganese and Cobalt or Li-NMC for short. These batteries are 25% lighter than the outgoing LiFePo4 batteries and deliver consistantly higher voltages across the voltage range which translates into more speed and range. We employ custom HPC specific moulds and mixtures of our prismatic pouch cells in the Standard and HPC Elite NMC packs.  These are proprietary performance cells from HPC and we do sell to OEM customers as well.  We can also build ANY pack you can dream of using the latest Panasonic or Samsung high drain 18650's- just ask! If you want to build a 200+ mile range bike, it can be done, so let your imagination run wild! The standard battery is 11Ah.  Optional 12.5Ah battery adds about 15%. The 13Ah HPC Elite pack provides our highest energy density battery with the lowest internal resistance and voltage sag.  It is the ultimate battery for big power users.

Choosing a Charger- By default any battery system you purchase from us will come with a 2A Charger. This means that if you have a 10Ah battery system it will charge in about 5 hours. You can choose to upgrade to a 4A charger which is twice as fast and will charge in half the time (2.5 hours for a 10Ah pack). Finally the fastest charger we carry is a 6 Amp Charger which can charge in about 1.6 hours (or 3x as fast as the standard charger).

Choosing a Wheel Build- Choose the kit with the same size wheel as the bike you wish to convert. If you have a 26" bike you would like to convert then choose one of the 26" wheel options. Be sure to pick your preference of an all silver or all black wheel and the size. All of our wheel builds feature the best spokes (Sapim) you can find and very sturdy double walled aluminum rims. All wheels are hand built at our facility in Chatsworth, CA, and we use only Phil Wood spokes, cold rolled and cut on our Phil Wood spoke machine. Our wheel builders have 40+ years of combined wheel building experience.  PLEASE SPECIFY AT CHECKOUT IF YOU REQUIRE A V-BRAKE COMPATIBLE RIM!

Choosing a Throttle- This is totally up to the end user- It comes down to personal preference do you prefer a motorcycle type twist grip throttle or a thumb throttle? 95% of our bikes come with a twist throttle if your shifters are thumb throttles

Choosing a Freewheel- Choose the number of speeds on your freewheel based on the number of rear speeds on your bike. Most 21 speed bikes use a 7 speed freewheel 24 speed bikes use an 8 speed 27 speed bikes use a 9 speed freewheel and 30 speed bikes use a 10 speed freewheel.

Choosing a Rack/Bag system-We also offer our exclusive Frame Bag battery system. The frame bag allows a much more central weight balance These bags are hand made in the USA with exceptional attention to detail and make for an incredible ride! These new bags are waterproof, and fire retardant with nomex IIIA and kevlar on the inside.  The bags feature lockable storage and hardshell sidewalls to protect from punctures. The huge upside is the huge battery capacity- on a frame with good clearance, a 100 mile range battery is possible!

If you prefer a bolt on rear rack, we can do that as well! A rear rack and bag system is a no cost option.

New for 2017, we can also offer the hard case downtube battery like the one featured on our own HPC eXplorer e-bike. 

E-Bike Diagnostic Computer: The E-Bike Diagnostic computer is a very useful tool for your electric bike and is highly recommended. It delivers vital information about your electric kit at your fingertips such as: speed, distance traveled, battery level, and Efficiency (measured in Wh/mile). It also allows you to limit your power level to your desired level so you can save battery. With this computer you have the ability to make any kit street legal!

Performance Stats:

2000W System: Thunderbolt High Speed Motor: 34 MPH, Striker High Torque Motor: 27 MPH (52V High Performance Li-NMC)

*32 Mile MAX Range, battery weight: 8 lbs Motor Weight: 16 lbs (Gearless)

3000W System: Thunderbolt High Speed Motor: 39 MPH, Striker High Torque Motor: 32 MPH (63V High Performance Li-NMC)

*38 Mile Range battery weight: 9.5 lbs Motor Weight: 16 lbs (Gearless)

4000W System: Thunderbolt High Speed Motor: 45 MPH, Striker High Torque Motor: 38 MPH (74V High Performance Li-NMC)

*45 Mile Range battery weight: 11.4 lbs (Li-NMC) Motor Weight: 16 lbs (Gearless)

5000W System: Thunderbolt High Speed Motor: 50+ MPH, Striker High Torque Motor: 42 MPH (86V High Performance Li-NMC)

*55 Mile Range battery weight: 13 lbs (Li-NMC) Motor Weight: 17 lbs (Gearless)


 *Most kits ship within 1 week. In rare cases, if we are out of stock, shipping may take up to 4 weeks.  Please call in to verify current shipping times. Thanks

**Range Estimates are a maximum figure based on FLAT ground no pedaling 170 lb. rider 18-20 MPH steady cruise with standard 12.5Ah Li-NMC Battery System.**

This upgraded kit includes EVERYTHING you need to convert your personal bike into a High Performance Electric bike!

Customer Reviews (1)

4000W Hub Motor Kit

Posted by Tim on 20th Dec 2018
Hi Chris and Derek - here's some pics of what I've got and a testimonial you can post. Also there's a pic of the handlebar mount I made for the ShadowCaster light. My purpose was to build a commuter for my 50 mile round trip ride to work so I could get out of the traffic jams I encounter daily. There is a beautiful pedestrian and bike path that goes along the Crystal Springs lakes that parallels a good part of my highway commute. Why sit in traffic when I can have a scenic ride in to work away from cars? I went with the hub motor 4000 watt system with the hi-torque Striker motor and HPC Elite 75 mile upgraded battery. I've always had a sweet spot in my heart for Klein bikes and when I saw a Klein hard tail with factory disc brakes in my size, I knew I had the right platform for my new ride. Installing the kit wasn't hard since I have plenty of tools. One hiccup was the rear hub motor is not quite the exact same dimensions as my rear wheel so I had to "massage" the rear disc caliper hanger to allow the caliper to be centered on the disc. I also went with new downhill disc brakes since this bike and I weigh a lot and I needed awesome stopping power. So keep in mind, I was doing this for my commute to work, which it does really well. By using the motor as a kind of pedal assist to help me get up and over the Coast Range part of my commute, I found I could do the round trip to work and back and only use half of the battery! I had removed the suspension fork and mounted a slick aluminum fork and fast "commuter tires." The bike became a kind of one trick pony, and very good at it, but something was missing. It was fast, efficient, powerful, fun, but also stiff and not at all comfortable if I ventured off the pavement. Well something happened once I had it all together and started riding it. I discovered how amazingly powerful and fun this HPC kit was, and how much this Klein and I wanted to play in the dirt! So the suspension fork is back on, and I have the fattest 26" tubeless tires I could squeeze in the frame. The difference is amazing! It's still plenty fast and great for my commute, but now it's an awesome trail and single track bike. The power is amazing and it can climb damn near anything! This bike has opened up all kinds of trails and back country adventures that I'd been forced to give up years ago due to a football injured knee. The 50-100 mile rides of my youth are now back and I can't stay off this bike! Thank you HPC for bringing me back to the bike riding I've missed for so many years.
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