Choose the Right Car Turntable Diameter

Choose a car turntable diameter using vehicle length, width, wheelbase, body overhang, turning clearance, site layout and project use.

Short answer

The right car turntable diameter is the smallest platform that keeps the largest vehicle's tires and body within the usable circle while leaving practical clearance for entry, rotation and exit. Check overall length, width, wheelbase, front and rear overhang, turning path, walls, columns and project use before selecting CTB or CTA.

Key facts

Planning point	Practical meaning
Selection basis	Use the largest and heaviest vehicle expected in normal operation, not the smallest car or a generic sedan.
Vehicle footprint	Confirm overall length, width, wheelbase, front overhang, rear overhang, tire position and gross vehicle weight.
Site envelope	Check the available circle, door opening, walls, columns, slope, entry direction and clearance needed before and after rotation.
Residential use	Prioritize a repeatable tire position, safe body clearance and a practical forward exit for daily drivers.
Showroom use	Allow visual margin around the vehicle and check visitor paths, camera distance, lighting and display finish.
Installation choice	CTB pitless and CTA pit-mounted systems use different floor, ramp and pit arrangements; diameter alone does not select the structure.
Quotation input	Send vehicle data, site dimensions, photos or drawings, installation preference, voltage and destination for review.

Why vehicle length alone is not enough

A vehicle can be shorter overall but still have a long wheelbase, wide body or large front and rear overhang. The wheelbase shows where the tires sit, while the overhang shows how far the body extends beyond the axles during rotation. The platform must support the tire path and leave the body clear of the platform edge and nearby structures.

Two vehicles with similar total length can therefore need different review. A wide SUV may need more side clearance than a sedan. A low sports car may need careful ramp and approach review on a pitless CTB platform. A heavy electric vehicle may fit the diameter but require a higher rated load. Diameter and load capacity should be confirmed together.

A practical diameter selection workflow

1. Define the largest regular vehicle

Record the vehicle model, overall length, overall width including the practical mirror position, wheelbase, gross vehicle weight and ground clearance. If several vehicles will use the turntable, use the largest footprint and the highest expected weight rather than averaging the fleet.

2. Mark the tire rectangle and body envelope

A site sketch should show the front and rear axle positions, tire position, body width and front and rear overhang. The tires need a stable position inside the usable platform area, while bumpers, mirrors and body corners need clearance as the vehicle rotates.

3. Review the swept path

The body corners do not remain in one fixed position during rotation. Check the circular area around the vehicle for walls, columns, garage doors, cabinets, steps, handrails and landscaping. Also check whether the driver can enter the platform consistently without difficult steering corrections.

4. Check approach and exit space

A platform that fits inside the available floor area may still be impractical if the entrance angle is too sharp or the garage door is too narrow. Review driveway direction, ramp or pit edge, slope, door opening, nearby walls and the forward-exit path after rotation.

5. Match the application

Residential projects usually favor reliable daily positioning and enough clearance for the regular driver. Showroom and 360 photography projects may need additional visual space around the vehicle, a centered display position, visitor clearance and a camera path. The same vehicle can therefore lead to a different preferred diameter in a private garage and a display studio.

6. Confirm structure and rated load

After the usable diameter is understood, confirm whether the site suits CTB pitless or CTA pit-mounted installation. CTB is reviewed for finished floors, ramp space and vehicle ground clearance. CTA is reviewed with pit geometry, concrete, drainage, conduit and final floor finish. The final model also depends on rated load, controls and project conditions.

Measurements to prepare

Measurement	Why it matters	How to record it
Overall vehicle length	Defines the basic body envelope but does not determine diameter by itself.	Use manufacturer data or measure from the front-most to rear-most body point.
Vehicle width	Affects side clearance, body corner sweep and showroom presentation.	Record body width and note whether mirrors remain extended during use.
Wheelbase	Shows axle spacing and helps locate the tires on the platform.	Use manufacturer data or measure between front and rear axle centers.
Front overhang	Shows how far the front body extends beyond the front axle during rotation.	Record the distance from front axle center to the front-most body point.
Rear overhang	Shows how far the rear body extends beyond the rear axle.	Record the distance from rear axle center to the rear-most body point.
Gross vehicle weight	Determines rated-load review, especially for SUVs and EVs.	Send the published gross or maximum operating weight, not only curb weight when available.
Available site circle	Confirms whether the platform and surrounding clearance can fit.	Mark walls, columns, doors, steps, cabinets and fixed landscape edges on a drawing.
Entry and exit path	Confirms whether the driver can reach and leave the platform consistently.	Send a plan view, photos from several angles or a short video of the vehicle path.

Residential and showroom differences

A private garage does not need unnecessary display margin, but it does need a repeatable parking position and practical clearance for daily use. The review should consider the driver, door opening, wall position, slope and whether the vehicle must leave forward into a narrow road or basement ramp.

A showroom may prefer a larger visible border around the car, especially when customers walk nearby or cameras capture the vehicle from several angles. Lighting, floor finish, visitor circulation, operator position and 360 photo distance can affect the preferred platform size even when the vehicle is the same.

When a standard diameter may not fit

A standard model should not be selected without review when the project includes very large SUVs, long-wheelbase vehicles, heavy EVs, low-clearance sports cars, unusual entry angles, closely spaced columns or a requirement for extra display margin. Huanyu can review a project-specific diameter, but the available site circle, structural layout, packing and transport limits still need to be confirmed.

Information to send for a diameter review

Largest vehicle make and model, or overall length, width, wheelbase, front overhang, rear overhang and gross weight.
Available circular floor area and the preferred platform diameter if one is already shown on the drawing.
Garage, driveway, basement, showroom or 360 photography application.
Door opening, wall, column, cabinet, step, slope and entry-direction dimensions.
Finished floor, renovation, new-build pit or undecided installation stage.
CTB pitless, CTA pit-mounted or undecided preference.
Vehicle ground clearance and whether a ramp is acceptable.
Local voltage, destination country and required trade term if known.
CAD drawing, hand sketch, site photos or a short video showing entry and exit.

Frequently asked questions

What diameter is suitable for a normal sedan?

There is no single sedan diameter that is correct for every site. Confirm the actual sedan length, width, wheelbase, overhang and available floor area. The entry angle, walls and desired clearance can change the recommendation even for vehicles in the same class.

Is total vehicle length enough to select the platform?

No. Total length is only the starting point. Wheelbase, tire position, body width, front and rear overhang, ground clearance, gross weight and the vehicle's swept path all affect the practical platform and model selection.

How should SUVs and electric vehicles be reviewed?

Use the largest expected vehicle dimensions and gross weight. SUVs may have greater width and overhang, while electric vehicles can be heavier than similarly sized combustion vehicles. Diameter, rated load, ramp clearance and approach conditions should be reviewed together.

Can one turntable serve several different vehicles?

Yes, when the diameter and rated load are selected for the largest footprint and highest expected weight. Send the main vehicle list and identify which vehicle will use the platform most often so daily positioning remains practical.

Does a showroom need a larger diameter than a private garage?

Not always, but a showroom may need more visible margin around the vehicle for visitors, lighting, photography or 360 video. A private garage usually prioritizes daily access and forward exit. The application should be reviewed before fixing the diameter.

How do walls, columns and the entrance angle affect diameter?

They define the usable site envelope. A round platform may fit on paper while the vehicle still cannot approach, rotate or leave safely. Mark fixed obstacles and entry direction on a plan, then provide photos or video for path review.

What should I send Huanyu before requesting a diameter recommendation?

Send the largest vehicle data, available floor dimensions, door and obstacle positions, entry direction, project use, floor or pit condition, CTB or CTA preference, destination and any drawings or site photos. Huanyu can then review diameter, rated load and installation type together.

Next step

Do not order from a diameter label alone. Compare the vehicle footprint, swept path, site envelope, installation type and rated load first. Send Huanyu the vehicle data and a site drawing or photo set for a project-based CTB or CTA size review.