The 1966 MG belongs to the era when compact British sporting and touring cars relied on light weight, responsive steering, and modestly sized tires to deliver their character. For many owners, the appeal today is preserving that balanced feel while choosing a tire that suits real road use and the car’s visual presentation. This fitment centers on two 14-inch options: a 5.90-14 bias-ply size and a 165R14 radial. Available choices lean toward blackwall radials from Pirelli, Michelin, and Vredestein, making construction and period-style appearance the key decision before road use or restoration work.
Which Tire Size Is Right for The 1966 MG
The 1966 MG uses two primary tire sizes, and the first step is deciding whether the car is being kept on its traditional 5.90-14 bias-ply fitment or moved to a 165R14 radial on the same 14-inch rim diameter. Because both sizes apply to the covered sub-model, the real choice is less about trim level and more about construction, driving character, and the type of tire presentation you want on the car.
165R14 is a Euro-metric radial size in which 165 identifies the nominal section width in millimeters, R indicates radial construction, and 14 identifies the wheel diameter in inches. On the 1966 MG, this size represents the radial fitment choice for owners who want a period-appropriate metric radial format on a 14-inch wheel. Available selections are blackwall tires from Pirelli, Michelin, and Vredestein across series such as Cinturato CA67, XAS, and Sprint Classic. It is the size to evaluate when road use, radial construction, and a traditional European tire look matter most.
5.90-14 is a numeric bias-ply size, with 5.90 referring to the nominal section width in inches and 14 identifying the wheel diameter. For the 1966 MG, this is the vintage bias-ply fitment and speaks directly to buyers who want to stay with the tire construction and sizing language associated with the car’s original era. Its main appeal is preserving a traditional look and setup rather than moving to a modern metric radial format. This size deserves a closer look when restoration character and construction authenticity are more important than changing tire type.
Tire fitment is straightforward here because the covered sub-model uses the same two 14-inch tire size paths. Checking the exact sub-model still matters so the car is evaluated as a Magnette IV before choosing between the bias-ply and radial constructions.
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1966 MG Magnette IV
The 1966 MG Magnette IV can be fitted with either the 165R14 radial size or the 5.90-14 bias-ply size, both built around a 14-inch rim diameter. That gives the owner a clear construction choice between a traditional period-style bias-ply presentation and a classic radial format better aligned with many road-use focused selections.
The tire sizes listed on this page assume factory-standard vehicle configuration. The following modifications may affect tire fitment and are not reflected in this guide:
Suspension changes (lowering, lift kits, spring replacements)
Body alterations (fender modifications, custom bodywork)
If your vehicle has been modified from factory specifications, verify tire clearance before purchase.
Best 1966 MG Tires for sale
Current 165R14 choices focus on blackwall radial tires from Pirelli, Michelin, and Vredestein. The product grid is where to compare classic European series, construction details, and rim-width specifications that can affect how a radial setup is evaluated on a 1966 MG.
Owners of a 1966 MG usually want clarity on the two primary tire sizes, the difference between radial and bias-ply fitment, and what to inspect before putting a collector-era British car back on the road.
Tire Size & Fitment
What tire size fits a 1966 MG?
The 1966 MG uses two primary tire sizes: 165R14 in radial construction and 5.90-14 in bias-ply construction. Both are built for 14-inch wheels, so the main fitment question is not wheel diameter but which construction and sizing format the car is set up to use.
That choice affects more than the numbers on the sidewall. A buyer should confirm whether the car is being kept in a traditional bias-ply configuration or fitted with a classic radial, then verify wheel width, overall clearance, and the actual wheel setup if the car has been changed from stock over the years.
What size rim does a 1966 MG use?
The primary tire fitments for the 1966 MG use a 14-inch rim diameter. That applies to both the 165R14 radial and the 5.90-14 bias-ply size, which keeps wheel diameter consistent even though the tire construction and sizing systems differ.
Rim diameter is only one part of the check, especially on an older car that may have had wheels replaced. It is still wise to confirm the actual wheel width and condition before selecting a tire, particularly if the goal is to move from a bias-ply setup to a radial tire with its own rim-width requirements.
What does 5.90-14 mean on a 1966 MG?
5.90-14 is a numeric bias-ply tire size. The 5.90 refers to the tire’s nominal section width in inches, while 14 identifies the wheel diameter in inches, making it part of the older sizing language commonly associated with mid-century vehicles.
For a 1966 MG, that size points to the bias-ply path rather than the radial one. Buyers considering it should think about whether they want to preserve a traditional construction and look, and they should confirm the car’s wheel condition and intended use before selecting a bias-ply tire over a radial alternative.
Choosing the Right Tire
What should I consider when choosing a 165R14 tire for a 1966 MG?
Start with the fact that 165R14 is the radial fitment for the 1966 MG and is offered as a blackwall tire from Pirelli, Michelin, and Vredestein. The available series include Cinturato CA67, Michelin XAS, and Sprint Classic, giving the buyer several classic European-style radial choices.
Selection should then come down to wheel compatibility, how closely the tire matches the look you want, and any useful product details such as rim-width range, weight, or load information. A car that still carries older wheels should have those wheels measured and inspected before a radial tire is chosen for regular road use.
What sidewall styles are available for 1966 MG tires?
The available 165R14 radial products for the 1966 MG are blackwall tires. That gives the car a restrained, traditional appearance consistent with many classic European tire presentations rather than a wide whitewall, stripe, or raised-letter look.
Sidewall style matters most when appearance is a major part of the purchase decision. A blackwall radial can suit a clean driver or restoration-oriented presentation, but the final choice should still follow the correct tire size and construction path first, since visual preference does not override wheel compatibility or overall fitment needs.
What brands offer tires for the 1966 MG?
For the 165R14 radial fitment, the 1966 MG has product options from Pirelli, Michelin, and Vredestein. Those brands appear in classic blackwall radial offerings, each tied to well-known vintage-oriented tire series rather than a single generic replacement option.
Brand is only one part of the decision. It helps more to compare the specific series, the rim-width guidance where available, and the overall direction of the car, whether that means maintaining a classic European road feel or simply finding a radial tire that suits the wheel setup already on the vehicle.
Restoration & Appearance
Which tire should I choose for a period-style 1966 MG?
A period-style 1966 MG can be approached in two different ways: a 5.90-14 bias-ply for a more traditional construction and appearance, or a 165R14 radial in a classic Euro-style format. Both sizes belong to the car’s fitment picture, but they support different restoration and road-use priorities.
The better choice depends on what period-style means for the project. A buyer focused on preserving an older tire character may lean toward the bias-ply path, while someone restoring the car for regular driving may prefer a blackwall radial presentation. When exact originality matters, vehicle-specific historical references should guide the final decision.
How does tire construction affect the appearance of a restored 1966 MG?
Tire construction changes the visual impression of a restored 1966 MG even when the wheel diameter stays at 14 inches. A 5.90-14 bias-ply keeps the car in an older numeric sizing format, while a 165R14 radial presents the more modern metric sidewall language used by classic European radial tires.
That difference matters because many restorations are judged as much by stance and sidewall presentation as by the tread itself. Buyers comparing the two should think about whether the car is being restored as a traditional display piece, a road car, or something in between, then make sure the wheel setup supports the selected construction.
Fitment, Maintenance & Road Use
Can modifications affect tire fitment on a 1966 MG?
Yes, modifications can affect tire fitment on a 1966 MG even though the primary tire sizes are 165R14 and 5.90-14 on 14-inch wheels. Changes to wheel width, wheel offset, ride height, suspension components, or body clearance can alter how either size sits and moves on the car.
A car with aftermarket wheels or suspension work should be checked carefully before new tires are chosen. The most useful steps are measuring the actual wheels, checking clearance at steering lock and through suspension travel, and making sure the selected construction still suits how the car will be used on the road.
What should I inspect before driving a 1966 MG on new tires?
Before driving a 1966 MG on new tires, inspect the wheels for damage or corrosion, confirm the wheel dimensions, and make sure the tires are seated and inflated correctly. It also makes sense to look over the steering and suspension condition so the new tires are not being asked to compensate for worn components.
Collector-era cars often sit for long periods, so a broader safety check is worthwhile. Examine the old tires that are coming off for uneven wear clues, then verify alignment, look for rubbing points inside the wheelhouse, and check that the spare and valve hardware are in usable condition before any longer road trip.
How should tires on a collector 1966 MG be maintained?
Tires on a collector 1966 MG should be maintained with regular pressure checks, routine visual inspections, and periodic examination for cracking, bulges, cuts, flat spotting, or slow air loss. Low-mileage vintage cars can age tires long before they wear them out, so appearance and condition matter as much as tread depth.
Storage habits play a big role in long-term tire health. Keeping the car away from prolonged sunlight, heat, moisture, and ozone sources can help preserve the tires, and moving the car occasionally helps avoid long-term flat spotting. Any tire that shows age-related deterioration deserves professional evaluation before road use resumes.
