1968 Buick Tire Fitment Guide

1968 Buick vehicles use six bias-ply sizes across eight models: 8.85-15 for Electra 225, LeSabre, and Wildcat; 8.45-15 for LeSabre, Riviera, and Wildcat; 775-14 for Skylark, Special, and Standard Wagon; F70-14 for Skylark; 825-14 for Special, Sportwagon, and Standard Wagon; and 855-14 for Sportwagon. The 14-inch sizes mount on 14-inch wheels and the 15-inch sizes mount on 15-inch wheels. Rim-width guidance appears for 775-14 at 5.00 to 6.00 or 5.50 to 6.00 inches depending on product, F70-14 at 6.00 to 7.00 inches, 825-14 at 5.00 to 6.00 inches, and 855-14 at 5.50 to 6.00 inches.

That spread means a buyer should identify the exact 1968 Buick model before choosing a tire page or product family. Full-size Buicks such as Electra 225, Riviera, LeSabre, and Wildcat sit in the 15-inch group, while Skylark, Special, and the wagons use 14-inch sizes with additional variation inside that family.

On a 1968 Buick, sizes such as 8.45-15, 8.85-15, 775-14, 825-14, and 855-14 are numeric bias-ply tire codes. The number before the dash is the nominal section width, while the number after the dash is the wheel diameter in inches. So an 8.45-15 is a bias-ply tire with a nominal 8.45-inch section width for a 15-inch wheel, and a 775-14 is a bias-ply tire with a nominal 7.75-inch section width for a 14-inch wheel.

Modern buyers sometimes mistake the first number for tread width or overall diameter, but on period American bias-ply sizing it functions as a width-based size code. For a 1968 Buick, the key takeaway is that the wheel diameter is easy to read from the second number, while the first helps distinguish narrower and wider fitments within the same general model family.

No. 1968 Buick models do not share one universal tire size across the lineup. Buick's full-size cars use 15-inch numeric sizes, while Skylark, Special, Standard Wagon, and Sportwagon use 14-inch sizes, and some models carry more than one acceptable period size within their own range.

That matters because a 1968 Buick buyer cannot choose by year and make alone the way they sometimes can with a single-model specialty vehicle. Confirming whether the car is an Electra 225, Riviera, Skylark, Special, Sportwagon, Standard Wagon, LeSabre, or Wildcat narrows the choice immediately and avoids crossing between 14-inch and 15-inch fitments.

1968 Buick tire sidewall choices vary by size. The 775-14 comes in narrow whitewall and redline versions, F70-14 comes in pin white stripe, redline, and raised white letter styles, 825-14 comes in blackwall and narrow whitewall, and 855-14 comes in narrow whitewall. The 15-inch Buick sizes appear here without product-sidewall detail, so buyers of Electra 225, LeSabre, Riviera, and Wildcat should move to the model or size page next.

For a 1968 Buick restoration, sidewall style often affects the look as much as the size itself. Narrow whitewalls suit many mainstream and luxury Buick restorations, while redlines, pin stripes, and raised white letters make the strongest visual sense on sporty intermediate-era applications such as a Skylark built around a muscle-car presentation.

1968 Buick coverage here includes US Royal, BFGoodrich, Firestone, and Goodyear. The 775-14 is available from US Royal, BFGoodrich, and Firestone, F70-14 comes from Firestone and Goodyear, and both 825-14 and 855-14 come from BFGoodrich. Every product shown for these sizes is a bias-ply tire.

Brand choice on a 1968 Buick usually comes down to balancing appearance and period character within the correct size. Buyers who care about a particular sidewall treatment may find the brand decision narrows quickly, especially on F70-14 where the sidewall look is part of the appeal, or on 825-14 and 855-14 where BFGoodrich carries the available range.

For a 1968 Buick Skylark in F70-14, Firestone Wide Oval and Goodyear Custom Wide Tread share the same basic bias-ply construction, 14-inch rim diameter, 6.00 to 7.00-inch rim-width range, and 1500-pound load rating at 32 psi. The visible differences are sidewall presentation and weight: Firestone appears in pin white stripe, redline, and raised white letter form at about 24 pounds, while Goodyear appears in raised white letter form at about 25 pounds.

That makes the choice more about the look you want on the car than a major fitment difference. A buyer restoring a 1968 Buick Skylark to a particular street-machine or showroom-era appearance should decide which sidewall treatment matches the build before choosing between those two classic muscle-era product lines.

Rim-width guidance depends on the 1968 Buick tire size. The 775-14 fits rims from 5.00 to 6.00 inches or 5.50 to 6.00 inches depending on the product, F70-14 fits 6.00 to 7.00-inch rims, 825-14 fits 5.00 to 6.00-inch rims, and 855-14 fits 5.50 to 6.00-inch rims. Those ranges are specific to each size and should not be transferred from one Buick application to another.

Wheel diameter alone is not enough when setting up a 1968 Buick. A 14-inch wheel may still be unsuitable if its width falls outside the tire's approved range, so it is smart to measure the wheel and compare it to the tire's approved rim-width span before committing to a size.

Tube requirements are not called out for these 1968 Buick products, so the safer approach is to confirm the construction details on the exact tire and wheel combination before installation. Bias-ply collector tires may be used in tube-type or tubeless applications depending on the specific casing design and the wheel itself, especially on older steel wheels that have been restored, refinished, or previously repaired.

That means the wheel condition matters just as much as the tire choice on a 1968 Buick. If the car is still on original-style rims, a restoration shop or marque specialist can help determine whether tubes are appropriate, and that check is worth making before mounting to avoid rework later.

Original 1968 Buick wheels can only be shared within the same wheel-diameter family. The 14-inch tires belong to Skylark, Special, Standard Wagon, and Sportwagon applications, while the 15-inch tires belong to Electra 225, LeSabre, Riviera, and Wildcat applications. Within the 14-inch group, wheel width still has to match the tire's approved range.

In practice, that means a 1968 Buick owner should think in two steps: first confirm whether the car uses 14-inch or 15-inch wheels, then verify the wheel width against the tire size being considered. Even when two sizes mount on the same diameter wheel, that does not automatically make every original wheel interchangeable without checking width.

A 1968 Buick stores best in a cool, dry, dark space away from direct sunlight, electric motors, welders, battery chargers, and other ozone-producing equipment. Bias-ply tires are especially prone to temporary flat-spotting after long periods of sitting, and prolonged exposure to heat and ultraviolet light accelerates sidewall aging. Keeping the tires clean and properly inflated helps reduce stress while the car is parked.

If the car will sit for months at a time, rolling it periodically or supporting it in a way that reduces constant load on one contact patch can help preserve ride quality. Collector cars such as a 1968 Buick also benefit from tire covers and a routine pressure check during storage rather than waiting until the next drive.

Tire life on a 1968 Buick is usually determined more by age than by tread wear, since many collector cars see low annual mileage. A sensible rule is to begin evaluating tires closely once they reach five to seven years of age and to consider replacement around the ten-year mark regardless of remaining tread. The DOT date code on the sidewall is the starting point for that timeline.

A car that looks lightly used can still be running on rubber that has hardened, cracked, or aged internally. Owners of a 1968 Buick should judge tire condition by age, storage history, and visible sidewall health rather than assuming low miles alone make an older tire suitable for continued road use.

Tires on a 1968 Buick should be inspected before every drive and again before any longer outing. Look for sidewall cracking, weather checking, cuts, bulges, uneven wear, and any sign that a tire is losing pressure. Because these are bias-ply applications, it is also wise to watch for changes in ride feel or shape after the car has been parked for a long period.

Regular inspections catch age-related problems before they become roadside problems. On a collector Buick, that routine should include checking valve stems, confirming pressures when cold, and making sure the spare is serviceable too, since the spare often goes untouched for years until it is suddenly needed.

A 1968 Buick Skylark used bias-ply tires, and the size range here is 775-14 or F70-14 depending on the particular application and appearance package. That matches what enthusiasts expect from a 1968 American intermediate, since bias-ply construction remained standard for the era. No original-equipment brand should be assumed from size alone.

For an accurate restoration, the important first steps are confirming the exact model configuration and deciding whether the car should wear a more conservative factory-style sidewall or a stronger muscle-era visual treatment. Buick club references, factory literature, and marque specialists are the right places to confirm market- and trim-specific details before finalizing a show-level tire choice.

Correct tire fitment matters on a 1968 Buick because judges and knowledgeable enthusiasts notice size, construction, and sidewall style quickly. A full-size Buick wearing the wrong diameter, a Skylark using an obviously incorrect sidewall treatment, or a wagon wearing a size from another body family can all distract from an otherwise well-restored car. Bias-ply construction is usually expected when originality is the goal on a 1968 Buick.

Show standards vary by event, so the strictness of judging can range from casual period-correct appearance to detailed factory-authentic scrutiny. If the car is being prepared for concours or marque judging, verify the exact size family and sidewall presentation against Buick literature and club expertise rather than relying on general era assumptions alone.

For a 1968 Buick in 825-14, the BFGoodrich choices share the same basic fitment, bias-ply construction, 14-inch rim diameter, 5.00 to 6.00-inch rim-width range, and 1620-pound load rating at 32 psi. The real distinction is appearance: one is a blackwall, while the others use narrow whitewall styling in different stripe widths. Weight stays very close across the group at about 23 to 24 pounds.

That makes the decision largely a restoration-style question rather than a mechanical one. A blackwall can suit a plainer or more utilitarian presentation, while a narrow whitewall is often the right visual move for a better-trimmed Buick wagon or sedan from the late 1960s, assuming it matches the way the car is being restored.

1968 Buick tires in these sizes are bias-ply collector tires, and no speed ratings appear for the products here. That means safety for highway use depends heavily on overall condition, correct inflation, proper wheel match, and the health of the car itself. On a late-1960s Buick, braking, steering, suspension wear, and alignment can influence real-world road confidence just as much as the tire selection.

A sound, properly maintained 1968 Buick can be driven on modern roads, but it should still be treated like a vintage car rather than a new one. Before extended highway use, make sure the tires are age-appropriate, free of cracking, and correctly matched to the wheels, then drive within the limits of the vehicle's period chassis and braking design.

Load-and-pressure figures vary by size on 1968 Buick tires. The 775-14 carries 1580 pounds at 32 psi, F70-14 carries 1500 pounds at 32 psi, 825-14 carries 1620 pounds at 32 psi, and 855-14 carries 1740 pounds at 32 psi. Those figures are tire ratings, not universal vehicle settings, and they should not be swapped from one size or model to another.

For actual running pressure on a 1968 Buick, the best reference is the factory owner's manual or vehicle placard, then the tire maker's guidance for the specific reproduction tire being used. A pressure number tied to one tire's maximum rated load is not automatically the ideal day-to-day setting for another Buick size or model.

Before a longer drive in a 1968 Buick, inspect each tire for visible cracking, cuts, bulges, irregular wear, and proper cold inflation pressure. Confirm that the tires are seated correctly on the wheels, check valve stems for age or damage, and look at the spare as carefully as the four road tires. On a bias-ply car, pay attention to any vibration or pull that suggests flat-spotting, alignment issues, or a casing problem.

Tires are only one part of a worthwhile pre-trip check on a 1968 Buick. Brake function, fluid levels, steering play, suspension condition, and wheel-bearing health all deserve attention before any extended outing, because a well-chosen tire can only perform as well as the rest of the vintage car allows.