2019 Mercedes-Benz Trucks Tire Fitment Guide

2019 Mercedes-Benz Trucks vehicles use 24 distinct radial sizes: 235/50R18, 235/60R18, 235/45R19, 235/55R19, 255/50R19, 275/55R19, 235/40R20, 255/45R20, 265/45R20, 275/50R20, 285/40R20, 295/40R20, 255/40R21, 265/40R21, 275/45R21, 285/35R21, 285/45R21, 295/35R21, 295/40R21, 315/40R21, 285/40R22, 295/40R22, 325/35R22, and 325/40R21. They are spread across G550, G63 AMG, GLA250, GLA45 AMG, GLC300, GLC350e, GLC43 AMG, GLC63 AMG, GLC63 AMG S, GLE400, GLE43 AMG, GLE63 AMG, GLE63 AMG S, GLS450, GLS550, and GLS63 AMG models, with rim diameters ranging from 18 to 22 inches.

That means year and make alone are not enough to choose correctly. The practical path is to identify the exact model first, then confirm whether the vehicle is on 18-, 19-, 20-, 21-, or 22-inch wheels, especially on AMG models that often use staggered front and rear sizes. If the vehicle has changed wheels at some point, checking the sidewall on the current tires and measuring the wheel diameter is the safest starting point before moving to a model-specific page.

On a 2019 Mercedes-Benz Trucks tire, 255/45R20 is a metric radial size. The 255 is the nominal section width in millimeters, the 45 is the aspect ratio, meaning the sidewall height is 45 percent of the section width, the R identifies radial construction, and the 20 is the wheel diameter in inches. That format is typical of modern luxury and performance utility vehicles, and it is used on the GLC300, GLC350e, and GLC43 AMG in this year range.

Understanding that code helps you avoid one of the most common mistakes: matching only the width and missing the wheel diameter or profile. A 255/45R20 cannot substitute for a 255/40R21 or 255/50R19 just because the width is similar. On a modern Mercedes-Benz utility vehicle, the profile and rim diameter are integral to how the tire fits the wheel and clears the body, so the full size must match.

No, 2019 Mercedes-Benz Trucks models do not use the same tire size. The range covers compact GLA models, midsize GLC and GLE models, the larger GLS family, and the G-Class, and each group uses different combinations of widths, aspect ratios, and wheel diameters. Some sizes are shared among a few models, such as 265/45R20 across several GLC and GLE variants, but there is no single size that fits the entire 2019 Mercedes-Benz Trucks lineup.

That is especially important on AMG vehicles, where front and rear sizes may differ and wheel diameter can change from one package to another. If you are comparing options for a GLC43 AMG, GLE43 AMG, or GLE63 AMG S, treat each axle position and wheel package as its own fitment question. Checking the exact model badge and the tire size molded on the vehicle now is usually the quickest way to narrow it down.

2019 Mercedes-Benz Trucks tires in the sizes with current product coverage come mainly in Blackwall form, with an additional RWL option in 255/45R20. Specifically, 235/50R18 is offered in Blackwall, 295/40R20 is offered in Blackwall, and 255/45R20 is available in both Blackwall and raised white letter form. That sidewall spread reflects modern performance and utility styling more than vintage restoration concerns.

For most 2019 Mercedes-Benz Trucks applications, Blackwall is the closest visual match to original late-model luxury SUV presentation. RWL gives a more custom or sport-truck look and may appeal to owners who want a less factory-stock appearance. If appearance matters as much as fitment, it is worth deciding on the sidewall style early, because that can narrow the tire choices even when the size itself is already settled.

BFGoodrich, Nitto, and Pro-Trac all appear in the available 2019 Mercedes-Benz Trucks product range. BFGoodrich and Nitto cover 235/50R18, BFGoodrich, Nitto, and Pro-Trac cover 255/45R20, and Nitto covers 295/40R20. All of the currently covered products are radial tires aimed at modern road use rather than vintage-style reproduction construction.

Brand choice matters most after the size is settled, because the same model can use very different wheel diameters or width combinations depending on trim and package. Once you know the exact tire size, the next comparison is usually sidewall appearance, load rating, and intended use. A daily-driven GLC or GLA may lead you one direction, while an AMG owner focused on a more performance-oriented feel may favor another.

The biggest difference is fitment role, followed by wheel width and sidewall presentation. 235/50R18 is an 18-inch fitment used on the GLA250 and comes from BFGoodrich and Nitto in Blackwall form, with rim-width guidance around 6.5 to 8.5 inches and W-rated options. 255/45R20 is a 20-inch fitment used on the GLC300, GLC350e, and GLC43 AMG, with BFGoodrich, Nitto, and Pro-Trac options, Blackwall or RWL styling, and rim-width guidance up to 9.5 inches where published.

That means these two sizes are not competing alternatives for the same wheel; they serve different vehicles and different wheel diameters. The 235/50R18 buyer is usually working from a compact crossover fitment, while the 255/45R20 buyer is matching a larger wheel package on a midsize Mercedes-Benz utility model. If your vehicle has aftermarket wheels, use the actual wheel diameter and current tire size as the deciding reference before choosing between them.

Published rim-width guidance appears for two of the covered 2019 Mercedes-Benz Trucks sizes. The 235/50R18 products fit rims from 6.5 to 8.5 inches wide, with one Nitto example centered around 7.5 inches within that spread. The 255/45R20 products fit rims from 8.0 to 9.5 inches wide where that measurement is given. The 295/40R20 coverage here confirms a 20-inch rim diameter but does not add a wheel-width range.

Rim width matters because two tires with the same diameter can still behave differently if mounted on wheels outside the recommended range. Before replacing tires on a vehicle with factory options or aftermarket wheels, confirm the wheel width stamped on the wheel or measured directly. That is especially helpful on AMG models, where wider rear tires and staggered wheel packages are common and the wheel itself may be just as important as the tire size.

The available 2019 Mercedes-Benz Trucks products shown here are modern radial sizes without tube-type markings, and none carry a TT designation. Their size markings follow contemporary tubeless passenger and performance tire conventions, such as 235/50ZR18, 255/45ZR20, and 295/40ZR20XL. That points toward tubeless construction in the currently covered product range.

Even so, the wheel condition still matters. If a vehicle is on original late-model Mercedes-Benz wheels in sound condition, tubeless fitment is the normal expectation, but a damaged rim or a nonstandard wheel can change the conversation. Before installation, inspect the bead seats, confirm the valve stems are appropriate, and make sure the wheel is suitable for tubeless service rather than assuming any 18-, 20-, or 21-inch wheel is automatically ready.

A 2019 Mercedes-Benz Trucks should be stored on clean, properly inflated tires away from direct sunlight, standing water, and ozone-producing equipment such as motors, welders, battery chargers, and air compressors. Cool, dry indoor storage is ideal, and the vehicle should not sit for long periods with one section of each tire taking all the load. Radial tires resist flat-spotting better than older bias-ply designs, but they still benefit from movement during long storage.

For seasonal or collector use, move the vehicle periodically or place it on stands if it will be stationary for an extended period. Keeping the tires clean and free of petroleum-based dressings helps preserve the rubber, especially on high-value AMG wheels and larger diameter fitments where replacement costs can rise quickly. If the vehicle remains stored for months at a time, check inflation pressure before the next drive rather than assuming it held steady.

Tires on a 2019 Mercedes-Benz Trucks should be judged by age and condition as much as by tread depth. For collector, second-car, or low-mileage use, a good rule is to begin evaluating tires carefully around five to seven years of age and to treat ten years as a strong replacement point even if tread remains. The DOT date code on the sidewall is the quickest way to confirm age.

That matters because luxury SUVs and AMG models may accumulate fewer miles than a daily commuter while still aging out their tires. Heat cycles, sunlight exposure, and long storage periods can harden the rubber well before the tread looks worn. If a 2019 Mercedes-Benz Trucks vehicle still wears older tires with healthy-looking tread, inspect for cracking, reduced grip, and age-related stiffness before trusting them for regular use or longer highway trips.

Tires on a 2019 Mercedes-Benz Trucks should be checked before every drive and given a closer inspection before any longer outing. Look for cuts, sidewall cracking, bubbles, punctures, uneven wear, and signs of impact damage from curbs or potholes. Pressure should also be checked regularly, because modern low-profile performance sizes can feel acceptable while still being below their proper operating level.

A more thorough inspection every few months is wise on vehicles that see intermittent use, especially AMG models with wide rear tires and lower-profile sidewalls. Pay extra attention to the inner sidewall and shoulder areas, which are easy to miss on the vehicle. If the tire has recently lost pressure, have the valve stem and wheel sealing surfaces checked as well, since a slow leak can mimic normal seasonal pressure change.

Yes, the currently covered 2019 Mercedes-Benz Trucks tires are modern radial products intended for contemporary road use, and the available examples carry W speed ratings with a 168 mph ceiling. That includes the covered 235/50R18, 255/45R20, and 295/40R20 products. In ordinary U.S. highway driving, those speed ratings are well above legal road speeds, so the larger safety question is usually tire condition, inflation, and correct fitment rather than the letter rating alone.

A healthy tire on the correct wheel is only one part of the equation on a heavy luxury SUV or AMG utility vehicle. Alignment, suspension condition, brake health, and proper front-to-rear tire matching matter just as much, especially on staggered setups. If a 2019 Mercedes-Benz Trucks vehicle has older tires, visible sidewall aging, or mismatched sizes across an axle, fix that before planning sustained interstate driving.

Inflation pressure for a 2019 Mercedes-Benz Trucks should follow the vehicle placard or owner's manual first, because the same year and make covers many different curb weights, wheel diameters, and front-to-rear setups. In the available product range, published maximum load and pressure examples include 1609 pounds at 51 psi and 1819 pounds at 50 psi in 235/50R18, plus 1819 pounds at 51 psi in one 255/45R20 product. Those figures are tire capacity ratings, not a blanket operating-pressure recommendation for every model.

The practical takeaway is not to transfer one tire's sidewall pressure figure to another size or model. A GLA250 on 235/50R18, a GLC43 AMG on 255/45R20, and a GLC63 AMG on 295/40R20 can have very different factory inflation needs. Start with the Mercedes-Benz placard, then confirm the tire manufacturer's limits and load index so the wheel, vehicle, and tire all work together as intended.

Before a longer drive in a 2019 Mercedes-Benz Trucks, inspect each tire for cracking, punctures, bulges, shoulder wear, and any sign of impact damage. Check cold inflation pressure, verify that front and rear sizes match the intended fitment, and confirm that the spare, if present, is usable and properly inflated. On AMG models, make sure a staggered setup has not accidentally been rotated into an incorrect front-to-rear arrangement.

A longer trip is also the right time to look beyond the tires. Wheel balance, brake condition, alignment, and suspension wear can all affect how a larger luxury SUV feels at speed, and those issues often show up first as unusual tire wear or vibration. If the vehicle has sat for a while, take a short local drive before the trip to check for flat spotting, pull, vibration, or warning lights rather than discovering those problems on the highway.