650/700-20 Tire Size Guide

The 650/700-20 is an early numeric tire size that uses two nominal width figures and a wheel diameter. In this case, 6.50 and 7.00 identify the vintage width family associated with the size, while 20 means the tire mounts on a 20-inch wheel.

Unlike a modern P-metric code, the 650/700-20 does not spell out an aspect ratio, load index, or speed symbol within the size itself. It belongs to an older bias-ply sizing system used on antique passenger cars and light trucks, so buyers need to look beyond the size code and confirm wheel width, overall fit on the vehicle, and the specific tire's construction details before treating it as a direct substitute for anything newer.

The 650/700-20 fits a 20.0-inch wheel, which is 508.0 millimeters in diameter. That wheel diameter must match exactly, because tire beads are designed for one specific bead-seat diameter and cannot safely stretch to another size.

Wheel width matters too, and this size is used on rims from 4.00 to 5.00 inches wide. A correct diameter with the wrong width can still create fitment problems by altering the sidewall shape, changing how the tire sits in the wheel opening, and affecting steering clearance on older vehicles with narrow fenders and vintage suspension geometry.

The 650/700-20 has a section width of 6.5 inches, which is about 165.1 millimeters. Section width refers to the tire's widest inflated sidewall measurement, not the width of the tread where it contacts the road.

Clearance checks should be based on section width because the sidewall is what comes closest to fenders, leaf springs, steering arms, and brake hardware. Tread width is usually narrower, so buyers who look only at the contact patch can underestimate how much room the tire actually needs once mounted on the wheel.

Yes, the 650/700-20 and 65070020 refer to the same tire size. The difference is only in how the size is written, with one version using punctuation and the other written as a continuous number string.

You may also see the size written as 650 700 20, especially in older catalogs, handwritten vehicle records, or search results. Buyers should focus on the actual size values and wheel diameter rather than the punctuation style, then verify the wheel width range, tire construction, and intended vehicle use before making a fitment decision.

The 650/700-20 is commonly a tube-type fitment and is often set up with a tube. On antique applications like this, tube use is usually tied to the wheel design and the exact tire being used rather than the size code by itself.

Original-style wheels on prewar and early postwar vehicles often differ from later tubeless rim designs, so the complete wheel-and-tire system needs to be checked carefully. Before mounting the tire, confirm tube and flap requirements against the actual wheel construction and the specific tire manufacturer's guidance so the assembly matches the vehicle's intended setup.

The 650/700-20 weighs 31 pounds per tire in the products commonly offered in this size. That figure refers to the tire alone without the wheel, tube, or mounting hardware.

Tire weight matters more on antique vehicles than many owners expect because it contributes to unsprung weight and influences how the suspension responds over rough surfaces. When replacing a full set, keeping all four or all five tires consistent in size, construction, and general weight helps preserve balanced ride behavior and a more uniform period-correct stance.

The 650/700-20 is associated with antique and prewar passenger cars as well as some light trucks from the prewar to early postwar period. It belongs to the tall, narrow bias-ply era, when 20-inch wheel fitments were common on earlier automotive designs.

Application history should be treated as a starting point, not as a universal fitment rule. Older vehicles often saw wheel changes over the decades, so buyers should compare the existing wheel diameter, actual rim width, brake and suspension clearance, and original vehicle documentation before assuming a current wheel setup still matches the factory tire size.

The 650/700-20 is designed for rims from 4.00 to 5.00 inches wide. Staying within that range helps the tire hold its intended profile and keeps the sidewalls from pinching inward or stretching outward unnaturally.

A proper rim width is especially important on antique bias-ply applications because sidewall shape affects both appearance and steering response. If the wheel is outside that range, the tire may not sit correctly in the wheel opening, and the visual stance can look off even before any clearance issue shows up at full lock or under suspension movement.

The 650/700-20 is usually a strong candidate when the goal is to preserve an antique vehicle's original character. Its bias-ply construction and early numeric format align with the kinds of tires commonly used during the prewar and early postwar years.

Restoration decisions still depend on the vehicle's original wheel equipment, body style, and judging standards. Some owners prioritize exact historical presentation, while others mainly want the correct tall profile and visual proportions. Checking period documentation, surviving factory literature, and the wheel's actual dimensions is the best way to decide whether this size supports the result you want.

The 650/700-20 uses bias-ply construction, which typically gives an older vehicle a more traditional steering feel and sidewall behavior than a modern radial. Drivers often notice a period-style response that suits antique chassis design, especially on vehicles built around tall, narrow tires.

Ride and handling impressions depend on much more than the tire alone. Suspension wear, steering-box condition, alignment, wheel trueness, inflation, and tire age all affect how a bias-ply vehicle feels on the road, so buyers should judge this size as part of a complete vintage wheel-and-suspension system rather than expecting modern-car behavior.

The 650/700-20 is generally chosen for the tall-sidewall character expected on antique vehicles, and that profile contributes to the visual height and road feel associated with prewar and early postwar motoring. Bias-ply construction is part of that experience as much as the size itself.

Comfort depends heavily on vehicle setup, especially on older cars and light trucks that may still have original-type springs, shocks, and steering components. Owners who want the vehicle to look and feel historically appropriate usually focus on preserving the proper proportions first, then make sure the wheel width and tire condition support stable road manners.

The 650/700-20 can be used on present-day roads when the tire, wheel, and vehicle are all in sound condition, but it should be approached as an antique-size bias-ply fitment rather than a modern everyday replacement. Driving feel, braking response, and steering behavior will reflect the older construction and the vehicle's original design.

Before regular road use, inspect the full assembly carefully and make sure the wheel is correct for a tube setup if one is required. Interstate speeds, pavement grooves, crosswinds, suspension condition, and vehicle weight distribution can all influence how an antique tire feels, so buyers should match expectations to the era and purpose of the vehicle.

The 650/700-20 is available from Excelsior and Michelin. Both are offered here in bias-ply construction, which keeps the size aligned with the type of build and road feel most owners expect from an antique fitment.

Brand choice should be made around the vehicle's restoration goals, wheel setup, and the level of authenticity you want to preserve. Buyers comparing options in this size should look for consistency in construction type, dimensional suitability, and a matched look across the full set rather than treating brand name alone as the only measure of quality.

A quality 650/700-20 choice starts with the basics: correct bias-ply construction, proper fit on a 20-inch wheel, and compatibility with the 4.00 to 5.00 inch rim-width range. Those points matter more than marketing language because this size serves antique vehicles that depend on proper proportions and wheel fit.

Buyers should also think in terms of set consistency. Matching construction, overall appearance, and wheel compatibility across all tires helps preserve balanced handling and the right visual stance, while mixing dissimilar tire types or profiles can make an older vehicle feel uneven and look less authentic than the size itself would suggest.

Yes, sidewall appearance matters on the 650/700-20 because antique vehicles show a large portion of the tire and the visual style has a strong effect on the finished look. The products in this size are blackwall tires, which suit many traditional restoration and touring presentations.

Appearance should still be considered alongside fitment and intended use. On a prewar or early postwar vehicle, the right sidewall presentation works best when the tire also has the proper bias-ply construction, correct wheel diameter, and a profile that fills the fender opening in a way that looks natural to the period.

The 650/700-20 should be stored the same way any antique bias-ply tire should be stored: clean, dry, and away from direct sunlight, heat sources, electric motors, and ozone exposure. Even when tread looks good, long periods of sitting can age the rubber and affect the tire's condition over time.

Collector vehicles benefit from regular inspection during storage, not just before the next tour or show. Owners should watch for cracking, flat spotting, sidewall distortion, air loss, and wheel-condition issues, especially when the tire is often set up with a tube. Moving the vehicle periodically and checking the complete wheel-and-tire assembly helps reduce surprises later.

The 650/700-20 should be inspected regularly for cracking, cuts, bulges, uneven wear, and air loss, with extra attention before any longer drive. Antique-size bias-ply tires may spend part of their life on vehicles that sit for extended periods, so condition checks matter just as much as tread depth.

Inspection should include the wheel, valve area, and the mounted tire's shape as well as the tread surface. If the vehicle uses tubes, the condition of the wheel interior and related hardware becomes part of the maintenance picture too, since an older wheel setup can influence how reliably the assembly holds air and performs in service.

For a 650/700-20 in service, the most important routine maintenance is keeping the tires properly inflated, checking for uneven wear, and making sure the wheel remains sound and correctly sized. Antique bias-ply fitments respond noticeably to alignment condition, steering wear, and suspension looseness.

Drivers should also pay attention to changes in steering feel, vibration, or pull, since those signs can point to tire condition or a broader chassis issue. Regular checks are especially important on older vehicles that see mixed use, because low annual mileage can make it easy to overlook age-related deterioration between driving seasons.

The 650/700-20 should be replaced when age, cracking, bulges, repeated air loss, impact damage, or structural deterioration raise concerns, even if the tread is not worn out. Antique tires often age out before they wear out, especially on vehicles that spend long periods parked between uses.

Condition matters more than appearance alone, and older bias-ply tires deserve a careful review before any meaningful road use. Buyers and owners should inspect both the tire and wheel assembly, confirm that the tire still suits the vehicle's present use, and consult a qualified tire professional whenever the casing, bead area, or wheel condition looks questionable.

Before driving on the 650/700-20, check inflation, sidewall condition, tread condition, valve integrity, and any sign of cracking, bulging, or impact damage. A full visual inspection is especially important on antique vehicles because long storage periods and older wheel designs can affect the tire-and-wheel assembly as a whole.

Wheel compatibility should be confirmed at the same time, including the 20-inch rim diameter and the 4.00 to 5.00 inch wheel-width range. If the setup uses a tube, the wheel condition and tube-related components also matter, since safe operation depends on the complete assembly being suitable for the vehicle and road use planned.

Yes, the 650/700-20 should be approached as an antique-size bias-ply fitment with driving behavior that reflects an earlier era of vehicle design. Buyers should confirm current sidewall markings, review local requirements, and make sure the tire, wheel, and vehicle are all appropriate for the kind of road use they expect.

Modern traffic speeds, pavement quality, alignment sensitivity, and the condition of the vehicle itself all influence how comfortably an antique fitment can be used. A careful pre-trip inspection, correct wheel sizing, and attention to aging rubber are more important here than assuming an older tire size can simply be treated like a modern replacement.