Three arrangements, and the difference is not cosmetic. It determines whether a chair works in your hallway or on your lawn, and it is rarely explained at the point of sale.
Mid-wheel drive
Where the wheels are: the driven wheels sit under the middle of the chair, with casters front and rear. Six wheels touching the ground.
How it behaves: turns close to its own length, because the pivot point is roughly beneath the user. That is why it is the indoor answer.
The trade-off: with six wheels in contact it can feel unsettled on uneven ground, and on a threshold or a steep transition the front casters can lose contact briefly.
Suits: anybody whose chair lives mostly indoors, in an ordinary house, with ordinary doorways.
Rear-wheel drive
Where the wheels are: driven wheels at the back, casters at the front. The traditional arrangement.
How it behaves: drives like a car, tracks well at speed, and handles rough ground confidently. It needs considerably more room to turn.
The trade-off: the turning circle is the largest of the three, which makes it awkward in a small house.
Suits: outdoor use, longer distances, uneven surfaces, and anybody who finds mid-wheel drive twitchy.
Front-wheel drive
Where the wheels are: driven wheels at the front, casters at the back.
How it behaves: climbs obstacles and curbs well, because the driven wheels meet the obstacle first and pull over it. Turning circle sits between the other two.
The trade-off: can feel loose at higher speeds, because the rear end follows rather than leads and tends to swing.
Suits: people who meet a lot of thresholds and small obstacles, and who drive at moderate speed.
Measure before you choose
Turning radius is in every specification and almost nobody reads it. Take your own numbers first.
The narrowest hallway. The clear opening of the bathroom door, measured from the face of the open door rather than the frame. The space in front of that door, because turning into it needs more room than passing along the corridor. And the largest clear circle in the room where the chair will spend most of its time.
Our measurement guide covers taking those properly. Those four numbers rule out configurations faster than any conversation.
Suspension
Related and frequently bundled with the drive decision. Suspension matters most on mid-wheel chairs, because six wheels crossing an uneven surface produce more movement than four.
For somebody with pain, spasticity, or a condition affected by vibration, it is a clinical consideration rather than a comfort upgrade.
What else the configuration affects
Transport. Wheelbase and overall length differ, which affects whether a chair fits a vehicle lift or a conversion. Decide how it travels before buying it, and our vehicle lift guide covers the options.
Footplate position. Front-wheel drive puts wheels where feet want to be, which changes legrest geometry.
Obstacle climbing. Published climb heights vary by configuration. If your house has a threshold the chair must cross daily, that number matters more than top speed.
Try all three if you can
They feel genuinely different, and people have strong preferences that do not follow from any specification. Somebody who finds mid-wheel drive unnerving will not use it well, however correct it is on paper.
Drive each in a space the size of your hallway rather than across a showroom floor. Our guide to trying equipment applies here as much as to stairlifts.
Where this becomes clinical
Where the chair needs tilt, recline, alternative drive controls or a specified seating system, you are in complex rehab rather than retail, and that involves an ATP and a clinical team.
Our equipment guide explains where that line sits, and basic equipment ships free from our online shop.
Anti-tips and what they do
Small wheels or skids that prevent the chair tipping backward under acceleration or on a slope. Standard on most chairs and occasionally removed by users who find they catch on curbs.
Removing them changes the safety characteristics of the chair, and it is not a decision to take because a curb was annoying. Raise it with whoever specified the chair instead.
Climbing thresholds
Published obstacle climb heights differ by configuration, and front-wheel drive generally handles a threshold best because the driven wheels meet it first.
If your house has a threshold that has to be crossed several times a day, that figure matters more than top speed. Alternatively remove the threshold: a ramp costs very little and it is a better answer than a chair fighting an obstacle daily. Our floors guide covers what a half-inch level change does.
Slopes and camber
Any chair is less stable across a slope than up or down it. Approach curb cuts and driveways square rather than diagonally, and slow before turning on any gradient.
The Access Board sets the maximum slope for ramps at 1:12, which is a useful benchmark for what a chair is expected to handle comfortably.
Outdoor surfaces
Gravel, grass, sand and mud all favor larger wheels and rear-wheel drive. A mid-wheel chair on a lawn is working hard, and the caster wheels are what get stuck rather than the drive wheels.
If genuinely outdoor use is intended, say so at specification. It changes the answer, and our equipment guide covers the wider comparison.
Turning radius, published and real
Published figures are measured in ideal conditions with nothing in the way. A real hallway has a skirting board, a radiator, a door that does not open fully and something somebody put down.
Add a margin to whatever the specification says, and test in your actual space with your actual furniture.
What to do if the chair does not fit the house
Two answers and both are cheaper than a different chair. Swing-clear hinges gain a couple of inches on a doorway for very little. And moving furniture off a route frequently solves more than any equipment change.
Our accessibility guide puts the whole house in sequence, and basic equipment ships free from our online shop.
Trying all three in one visit
Ask a supplier to have one of each available rather than demonstrating whichever is in stock. Half an hour driving all three tells you more than any specification, and preferences here are strong and personal.
Drive in a marked-out space the size of your narrowest hallway rather than across an open floor. That is the test that matters.
What changes with the seating
Tilt, recline and elevation all change weight distribution and overall dimensions, and they interact with the drive configuration. A chair that turns tightly at rest may not with the seat raised.
Specify the seating and the drive together rather than separately, and our seating guide covers what each function is for.
Where a chair will be used in public buildings, check its turning radius against the Access Board route dimensions rather than only against your hallway.