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Two speed assistive power for your manual wheelchair, delivering the freedom of easier movement





COST:  FROM £4,725

SD Motion Assist

Transform your manual wheelchair into a power chair with the SD Motion Assist add-on electric propulsion system. Programmed to suit your individual strength, the motion assist system has two speeds and is perfect for providing a little extra strength without the need to transfer to a fully-powered wheelchair.

SD Motion Assist - Photos
SD Motion Assist - Photos
Can be quickly folded and wheels are quick release

Engineering excellence and built to last

The SD Motion Assist system can be fitted to a wide range of manual wheelchairs.

The motorised wheel hubs add power and control at the push of the hand rims. This enables the rider to use less energy to propel forward while still using their upper body to maintain strength.

Each push on the hand rim applies force to each wheel independently, so having one arm stronger than the other is not a problem.

With an approximate weight of 17kg, this is a lightweight alternative to a full power chair, and is easily transportable with its quick-release wheels.

With uphill-assist and roll-back prevention, ramps and inclines will no longer be an issue,  shoulder pain and fatigue will be reduced, and the two speed options will put you in complete control. 


Smart Tune software customises sensitivity, drivability and provides troubleshooting
We can use Smart Tune to customise the level of power and the level of right and left arm assist.


Travel longer and further with a battery range of up to 11 miles for nickel batteries and 18 miles for lithium.
Can fit a wide range of wheelchairs


Wheel-to-wheel communication allows for more precise control and operation.
Dual mode switch enables low to high mode and back at the switch of a button


Built-in control features include rollback prevention, downhill speed control, uphill ascent assist, and side slope stability control


Ability to customise for many types of riders
Especially useful for riders with uneven arm strength.
Quick-release wheels offer easy storage and transport


Discreet motors built into wheel hub.
Sleek, modern design retains manual chair look.

Technical Specifications

Drive system:Direct rear-wheel drive
Weight (without battery):14.5kg
Steering:Left and right hand rim steering
Driving wheel diameter:24"
Motor:30 minutes rated output: 24V 110W X2
Manual/electric mode:Switched by hand
Travel speed:8.5km/h forward and reverse
Maximum user weight:130kg (including rider, luggage and frame)
Battery:Nickel-Metal Hydride:  Weight 2.9kg. 24V x 6.7AH
Lithium-ion: Weight 3.6kg. 25V x 11.8AH
Battery charger:Power supply: AC100V to 240V, 50/60HZ
Fully automatic charging
Charging time: Ni-MH 2-3 hours, Li-ion 4.5 hours approx
Electric power range:Nickel-metal hydride battery: 18km / 11.3 miles
Lithium-ion battery: 30km / 18.1 miles

Brochures, Options, Accessories and Getting in Touch

Brochure downloads

For further information, please click below

Options and Accessories

View the extensive range of options and accessories

Get in Touch

Complete the quick enquiry form and one of our team will get in touch with you.

Frequently asked questions...

How can I get more information and book a demo?

All our brochures are available to be downloaded on our website. If you would like to book a demonstration you can fill out our enquiry form, email us, or give us a call. We'd love to hear from you.

Will the SD Motion Assist fit my wheelchair?

These systems are suitable for many 24" wheel manual wheelchairs. 

You can view our list of compatible wheelchairs here; SD Motion wheelchair list 

If your manual wheelchair does not appear on this list, please let us know the make and model of your chair so we can advise if the SD Motion Assist can be fitted to it.

How do I place an order?

Once you have had a successful demonstration of the system we will ask you to complete an order form listing your preferences.

If we are fitting the system to your existing chair we will arrange a date when your chair is available for conversion. The installation of the system will take 1-2 days and then will arrange to deliver the chair back to you with a familiarisation session.

For all orders placed we ask for a 50% deposit upfront with the remaining balance to be paid on receipt of the completed chair.

How do I operate the system?

The SD Motion Assist is operated with the hand rims, the same as a manual wheelchair, but with added power-assistance from the motors. There are switches either side of the wheel; the on/off switch converts the chair from manual to powered, and the mode switch allows you can choose your effort level.

What is the weight of this system?

The SD Motion Assist adds 14.5kg to the weight of your wheelchair. Plus another 3-4kg with the battery

Can this be used inside and outside?

The SD Motion Assist can be used both indoors and outside. The system only adds about an inch to the width of your wheelchair so doorways aren't a problem. Also, you can still fold your wheelchair as before, so this makes for easy transporting in a vehicle.

How can I personalise my SD Motion Assist chair?

You can choose from grey or black casters and rear wheels, with various options for tyre inserts. Choice of 10" or 14" armrest pads. Optional battery bag.

Do I need a large vehicle to transport it?

The SD Motion Assist allows the wheelchair to fold as before, and can easily be stored in the boot of a car, even a small one. We also fit hoists which can assist with lifting the additional weight.

What is the battery range with this system?

The Ni-MH battery weighs 2.9kg and has a range of up to 18km (11.3 miles)

The Lithium-ion battery weighs 3.6kg and has a range of up to 30km (18.1 miles) This battery has a 8 year life span

How often should I get this system serviced?

We recommend you have your SD Motion Assist system serviced annually to maintain the safety and reliability of the wheelchair.

What is the warranty?

All parts of the power system come with 12 months warranty.

How do I get replacement parts?

As the UK manufacturer we pride ourselves on holding a large stock of replacement parts.

Can I take my SD Motion abroad?

Yes. You will need to contact your airline before flying, and you may need to supply them with copies of the battery safety data sheet. You can find these in our Useful Information section on the battery page