The 1929 Graham 15 Series came from a moment when independent American automakers were building stylish, well-appointed cars for buyers who wanted substance as much as novelty. For today’s owner, that means tire choice is part of preserving both stance and road manners on a late-1920s automobile. The 1929 Graham 15 Series uses bias-ply fitments in 29X5.50 and 550-19, both tied to a 19-inch wheel application. In practice, the available choices center less on modern construction changes and more on period-style presentation, especially blackwall versus wide whitewall. The right selection starts with confirming which of the two period size designations matches the wheels and setup on the car.
Which Tire Size Is Right for The 1929 Graham 15 Series
The 1929 Graham 15 Series uses two primary tire size designations, and both are bias-ply fitments associated with a 19-inch wheel application. Because the same sub-model can be tied to either size notation, the first step is confirming how the car is currently equipped and which period size convention matches the wheel and tire setup before comparing appearance options.
29X5.50 is an antique diameter-by-section size, so the first number refers to the tire’s approximate overall diameter of 29 inches and the second refers to an approximate section width of 5.50 inches. It is a bias-ply fitment suited to the late-1920s sizing language many owners encounter on unrestored or carefully preserved cars. This designation matters mainly as a period fitment reference alongside the 19-inch wheel application used on the Graham. It is the size to evaluate when matching an existing antique-style specification and confirming that the wheel and tire marking conventions on the car align properly.
550-19 is a numeric bias-ply size in which 550 represents an approximate 5.50-inch nominal section width and 19 identifies the rim diameter in inches. For the 1929 Graham 15 Series, this is the size with available BFGoodrich choices in the Silvertown Classic Bias Ply line, including blackwall and 3.25-inch wide whitewall versions. Those sidewall differences can noticeably change the car’s visual character without moving away from a traditional bias-ply construction. This is the practical size to focus on when the wheel is confirmed as a 19-inch application and appearance is part of the decision.
Sub-model fitment is straightforward here because the covered Graham 15 Series sub-model uses the same pair of primary bias-ply size designations. Checking the exact sub-model still helps confirm that the wheel and tire notation on the car match the fitment you intend to keep.
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1929 Graham 15 Series 6 Cyl.
The 1929 Graham 15 Series 6 Cyl. uses the same period bias-ply fitment family represented by 29X5.50 and 550-19. Tire selection comes down to matching the wheel setup on the car and choosing the sidewall presentation that best suits a preservation-minded or restoration-oriented appearance.
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 1929 Graham 15 Series Tires for Sale
Available 550-19 tires for the 1929 Graham 15 Series come from BFGoodrich in the Silvertown Classic Bias Ply series, with a choice between blackwall and wide whitewall styling. The main comparison points are sidewall appearance, rim-width compatibility, and traditional bias-ply presentation.
Owners of a 1929 Graham 15 Series usually need clarity on period tire sizing, 19-inch rim fitment, sidewall appearance, and the checks that matter before putting a collector car back on the road.
Tire Size & Fitment
What tire size fits a 1929 Graham 15 Series?
The 1929 Graham 15 Series uses two primary bias-ply size designations: 29X5.50 and 550-19. These sizes describe the same general fitment family in two period-style naming conventions, and the Graham 15 Series 6 Cyl. is associated with both.
The practical step is confirming which size marking matches the car’s current wheels and the style of tire you want to run. Since collector cars can have older replacements or wheel changes from earlier restoration work, checking the wheel diameter and existing tire notation helps keep the selection aligned with the car’s actual setup.
What size rim does a 1929 Graham 15 Series use?
The 1929 Graham 15 Series uses a 19-inch rim application. That rim diameter is stated directly with the 550-19 size, and the available 550-19 products are built for a 19-inch wheel.
Rim diameter should be confirmed before ordering because a period car may have replacement wheels that look similar at a glance. It also helps to check wheel width and overall condition, especially on a late-1920s vehicle where age, previous repairs, or long-term storage can affect how confidently a new bias-ply tire can be mounted and used.
Do all 1929 Graham 15 Series sub-models use the same tire size?
The covered sub-model, the 1929 Graham 15 Series 6 Cyl., uses the same tire fitment family tied to 29X5.50 and 550-19. There is not a separate tire size split shown within the covered 15 Series sub-model information.
That keeps the fitment question relatively simple, but the owner still needs to verify what is actually on the car. Period-size notation can be confusing on pre-war vehicles, so matching the wheel diameter, existing size markings, and the intended appearance of the finished car is more useful than assuming every older replacement follows the same convention.
Choosing the Right Tire
What should I consider when choosing a 550-19 tire for a 1929 Graham 15 Series?
Start with the basics: the wheel must be a 19-inch application, and the tire should suit the Graham’s traditional bias-ply setup. In 550-19, the available choices stay within BFGoodrich’s Silvertown Classic Bias Ply line, so the main differences are sidewall style, rim-width compatibility, weight, and visual presentation.
A blackwall gives the car a restrained period look, while a 3.25-inch wide whitewall creates a more formal restoration-oriented appearance. It also makes sense to compare the wheel’s actual width against the tire specification and think about how the car will be used, whether it is primarily for show display, careful touring, or occasional local driving.
What sidewall styles are available for 1929 Graham 15 Series tires?
For the 1929 Graham 15 Series in 550-19, the available sidewall styles are blackwall and wide whitewall. Both are bias-ply tires in the BFGoodrich Silvertown Classic Bias Ply series, so the biggest visible difference is the car’s finished presentation rather than a change in tire construction.
That choice matters on a late-1920s car because sidewall treatment strongly influences the vehicle’s overall look. A buyer focused on a simpler touring appearance may lean toward blackwall, while someone pursuing a more formal restoration style may prefer wide whitewall, after checking period photos, marque references, and the look already established by the car.
What tire series are available for the 1929 Graham 15 Series?
The available 550-19 products for the 1929 Graham 15 Series are part of the BFGoodrich Silvertown Classic Bias Ply series. That keeps the buying decision focused less on switching among multiple series and more on selecting the sidewall treatment and confirming the wheel specifications.
Because the series stays consistent, the visual choice becomes the more meaningful distinction in the product grid. Comparing blackwall versus wide whitewall, along with rim-width suitability and the condition of the existing wheels, will usually do more to narrow the decision than looking for major character differences between separate tire families.
Restoration & Appearance
Which tire should I choose for a period-style 1929 Graham 15 Series?
A period-style 1929 Graham 15 Series should stay with the proper bias-ply fitment family, using the 29X5.50 or 550-19 sizing convention that matches the car’s wheel setup. In practical terms, 550-19 offers BFGoodrich Silvertown Classic Bias Ply choices that preserve a traditional pre-war tire appearance.
The next decision is visual rather than structural: blackwall for a simpler presentation or wide whitewall for a more formal look. When exact originality matters, the safest approach is to compare the tire style against period photos, marque-club guidance, and restoration records for the specific car instead of assuming one sidewall treatment suits every Graham equally.
Does correct tire fitment matter for a 1929 Graham 15 Series restoration?
Correct tire fitment matters a great deal on a 1929 Graham 15 Series because tire height, section width, and sidewall style all influence how the car sits and how authentic the finished restoration appears. Using the proper bias-ply size family also keeps the wheel-and-tire presentation in line with the era.
Appearance is only part of the equation. The wheel diameter, wheel width, and condition of the rims should still be confirmed before mounting new tires, especially on a nearly century-old car where replacement parts and earlier restoration choices may have changed the setup from what a buyer expects to find.
Fitment, Maintenance & Road Use
Can modifications affect tire fitment on a 1929 Graham 15 Series?
Yes, modifications can affect tire fitment on a 1929 Graham 15 Series, even when the correct period tire size has been selected. Replacement wheels, altered suspension height, brake conversions, or body and fender work can all change the clearances that matter on an older car.
A Graham that has been restored over many decades may not match its original wheel setup exactly, so it is worth measuring the actual rim diameter and width before choosing tires. Steering clearance, fender clearance, and the relationship between the tire and the chassis should all be checked carefully once the car is back on its wheels.
What should I inspect before driving a 1929 Graham 15 Series on new tires?
Before driving a 1929 Graham 15 Series on new tires, inspect the wheels for damage, check that the tire beads are seated properly, and confirm inflation matches the tire’s intended use. It also helps to look over the steering, suspension, and brake system since tire replacement often reveals issues that were hidden by old rubber.
Collector cars deserve a slow, methodical first road test. Watching for vibration, pull, rubbing, or unusual heat buildup can catch a wheel or clearance problem early, and a second pressure check after the first drive is a sensible habit on a pre-war vehicle that may have spent long periods parked before returning to regular road use.
How should 550-19 tires on a collector 1929 Graham 15 Series be maintained?
550-19 tires on a collector 1929 Graham 15 Series should be kept properly inflated, inspected regularly for cracks, cuts, bulges, and air loss, and protected from long periods of harsh sun, heat, and ozone exposure. Bias-ply tires on low-use vehicles also benefit from routine visual checks even when tread wear is minimal.
Storage habits matter as much as mileage on a car from this era. Keeping the Graham in a clean, dry space and moving it occasionally can help reduce long-term flat spotting, while periodic checks of wheel condition and valve integrity make it easier to catch aging issues before they become a problem on the road.
