The 1973 Citroen SM came from a brief period when Citroen combined advanced French engineering with grand touring ambition, creating a car still admired for its distinctive styling and highly individual road manners. Tire choice matters on an SM because the car was built around a radial-tire driving character rather than an earlier bias-ply setup. The primary fitment is 205R15 on a 15-inch rim, which keeps the conversation focused on selecting the right radial within the correct size. Available choices include blackwall and wide whitewall presentations in different tire series. For an SM owner, the real goal is balancing proper size, wheel compatibility, appearance, and intended road use.
Which Tire Size Is Right for The 1973 Citroen SM
The 1973 Citroen SM uses one primary tire size: 205R15. It is a radial fitment on a 15-inch rim, and the covered Base sub-model uses that same size, so the main decision is not between multiple factory tire sizes but between available radial styles, series, and appearance options within 205R15.
A 205R15 size uses a 205-millimeter nominal section width, radial construction, and a 15-inch rim diameter. In this older Euro-metric format, the aspect ratio is not stated in the size itself, and it is commonly understood as a tall-profile radial layout rather than a modern low-profile design. For the 1973 Citroen SM, this keeps the fitment aligned with the car’s radial-tire character. Available choices include a Phoenix European Passenger tire with a wide whitewall treatment and an Avon Turbosteel blackwall in the Textile series, giving owners a clear appearance decision as well as a fitment one.
Fitment is straightforward across the covered 1973 Citroen SM range because the listed sub-model uses the same 205R15 radial size. Checking the exact sub-model still matters, but the larger decision here is choosing the right 205R15 tire style and confirming the wheel setup on the car today.
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1973 Citroen SM Base
The 1973 Citroen SM Base uses the same 205R15 radial fitment on a 15-inch rim as the core model listing. That keeps tire selection centered on wheel compatibility, sidewall presentation, and the character of the available radial choices rather than on sorting through multiple primary sizes.
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 1973 Citroen SM Tires for Sale
Available 205R15 choices for the 1973 Citroen SM include radial options from Phoenix and Avon. The main points of comparison are sidewall style, with blackwall and wide whitewall choices, along with tire series and rim-width compatibility where stated.
These FAQs focus on the 1973 Citroen SM’s 205R15 radial fitment, 15-inch rim use, product-selection differences, appearance choices, and the wheel, suspension, and tire-condition checks that matter before road use.
Tire Size & Fitment
What tire size fits a 1973 Citroen SM?
The 1973 Citroen SM uses a 205R15 radial tire. That is the primary fitment for the vehicle, and the covered Base sub-model uses the same size, so there is not a separate alternate primary size to sort through within this listing.
That makes the buying decision more about choosing the right 205R15 tire than deciding between different fitment sizes. It is still smart to confirm that the car still has 15-inch wheels, especially if it has been modified over time, and to compare sidewall style, tire series, and wheel-width suitability before installing a new set.
What size rim does a 1973 Citroen SM use?
The 1973 Citroen SM uses a 15-inch rim with its 205R15 tire size. The size code itself ends in 15, which matches the wheel diameter the tire is built to mount on, and the available products for this fitment are also built for a 15-inch rim.
Wheel diameter should always be confirmed on the actual car before replacement, particularly on collector vehicles that may have seen aftermarket wheel changes. Rim width matters as well, since one 205R15 option is intended for a 5.50- to 6.00-inch wheel, and that specification can affect both mounting suitability and the final look of the tire on the car.
Does the 1973 Citroen SM Base use the same tire size?
Yes. The 1973 Citroen SM Base uses the same 205R15 radial tire size as the overall 1973 Citroen SM fitment. That keeps sub-model confusion to a minimum and makes the fitment side of the decision relatively straightforward within the covered range.
Even with shared fitment, the actual car should still be checked before ordering tires. An SM with replacement wheels, prior suspension work, or cosmetic changes may need closer review of wheel width, tire clearance, and overall stance so the selected 205R15 tire matches both the car’s setup and the owner’s appearance goals.
Choosing the Right Tire
What should I consider when choosing a 205R15 tire for a 1973 Citroen SM?
Start with the correct size and construction: 205R15 radial on a 15-inch rim. From there, compare the available tire’s intended character, sidewall style, tire series, and any wheel-width guidance that accompanies it, since those details shape both presentation and compatibility.
A blackwall tire gives the SM a cleaner, more understated look, while a wide whitewall changes the visual balance significantly. Wheel width should be verified on the car before purchase, and owners planning regular road use should also look at load information, overall tire condition, and whether the selected tire matches the way the car is actually driven.
What sidewall styles are available for 1973 Citroen SM tires?
The available 205R15 tires for the 1973 Citroen SM include both blackwall and wide whitewall sidewall styles. That gives SM owners a choice between a more restrained touring appearance and a much more noticeable period-style visual statement.
Sidewall style does not change the need to stay with the correct 205R15 radial fitment, but it can change the car’s overall presentation more than many buyers expect. Choosing between them usually comes down to restoration direction, wheel appearance, and whether the goal is a more European grand touring look or a more customized vintage presentation.
What brands offer tires for the 1973 Citroen SM?
Phoenix and Avon both offer 205R15 radial tires for the 1973 Citroen SM. The available options also differ in tire series and sidewall treatment, so the brand decision is tied closely to the kind of appearance and specification details the owner wants.
Rather than treating brand alone as the deciding factor, compare the full tire package. A Phoenix 205R15 is available in the European Passenger series with a wide whitewall, while the Avon Turbosteel is a blackwall tire in the Textile series, so the better choice depends on wheel setup, visual preference, and the way the SM will be presented and used.
Restoration & Appearance
Which tire should I choose for a period-style 1973 Citroen SM?
A period-style 1973 Citroen SM should begin with the correct 205R15 radial size, since the car’s fitment is already rooted in radial construction. From there, the choice depends on whether the goal is a more restrained blackwall touring look or a more dramatic wide whitewall presentation.
For owners pursuing a historically sensitive restoration, the safest path is to confirm appearance details through marque-specific references, photos, and restoration documentation for the exact car. Tire size comes first, but sidewall style can shift the character of the vehicle noticeably, so visual accuracy should be considered separately from basic fitment.
How does tire construction affect the appearance of a restored 1973 Citroen SM?
On a 1973 Citroen SM, construction does not create a bias-ply-versus-radial debate because the primary fitment is already radial. The visual differences are more likely to come from sidewall treatment, tread presentation, and the overall profile of the tire within the correct 205R15 size.
That means a restoration-oriented buyer can focus more on how the finished car should look rather than deciding whether to preserve an earlier tire type. A blackwall tends to keep the presentation cleaner and more restrained, while a wide whitewall introduces a stronger vintage styling cue that may or may not suit the restoration direction.
Fitment, Maintenance & Road Use
Can modifications affect tire fitment on a 1973 Citroen SM?
Yes. A 1973 Citroen SM may have the correct 205R15 tire size on paper, but aftermarket wheels, changes in wheel width, altered ride height, or suspension work can all affect how that tire fits and clears the body and steering components.
Checking the actual wheel diameter is only the first step. The owner should also confirm wheel width, look for clearance at full steering lock, and inspect the suspension condition before assuming any 205R15 tire will suit the car’s current setup. Those checks become especially important on collector cars that have changed hands several times.
What should I inspect before driving a 1973 Citroen SM on new tires?
Before putting a 1973 Citroen SM back on the road with new tires, inspect the wheels for correct diameter and condition, verify proper mounting, and check that the tires hold air consistently. It is also wise to look over valve stems, tread seating, and visible clearance around the fenders and steering components.
Collector cars often sit for long periods, so the rest of the chassis deserves attention too. Tire pressure should be set appropriately for the selected tires, and a short initial drive should be used to watch for rubbing, vibration, or pulling. Any unusual behavior should be resolved before regular road use or longer-distance driving.
How should 205R15 tires on a collector 1973 Citroen SM be maintained?
205R15 tires on a collector 1973 Citroen SM should be inspected regularly for pressure loss, cracking, sidewall cuts, bulges, and uneven tread wear. Even when the car is driven infrequently, age and storage conditions can affect tire condition long before the tread appears worn out.
Storage habits matter as much as mileage on a specialty car like the SM. Keeping the car away from prolonged sunlight, excess heat, moisture, and ozone sources can help preserve the tires, and periodic movement can help avoid long-term flat spotting. A careful visual inspection before each drive is a good habit for any low-use collector vehicle.
