2018 Mercedes-Benz GLA250 — Base Model

The 2018 Mercedes-Benz GLA250 Base Model shipped with 2 different factory tire sizes, depending on the wheel package it left the factory with (this can also reflect a staggered front/rear setup). Check your tire sidewall or door placard to confirm which one applies to your vehicle.

This trim shipped with more than one tire size (staggered fitment, front/rear, or optional wheel package). Confirm which one matches your vehicle by checking your tire sidewall or door placard.

235/50R18

Section width235 mm
Aspect ratio (sidewall height)50% (117.5 mm)
Rim diameter18"
Overall tire diameter~27.3"
Revolutions per mile~740

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235/45R19

Section width235 mm
Aspect ratio (sidewall height)45% (105.8 mm)
Rim diameter19"
Overall tire diameter~27.3"
Revolutions per mile~738

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What this size means for your Mercedes-Benz GLA250

On the 2018 Mercedes-Benz GLA250 Base Model, the factory 235/50R18 measures about 27.3″ in overall diameter with a 117.5 mm (4.6″) sidewall, and completes roughly 740 revolutions per mile. Its 50-series aspect ratio gives a balanced everyday-passenger profile — enough sidewall to soak up road shock while keeping steering response crisp. In tire terms it is a passenger (P-metric / Euro-metric) size.

The 235/50R18 and 235/45R19 roll within 0″ (0%) of each other in overall diameter, so they are interchangeable from a speedometer standpoint — the second size is an optional wheel package rather than a different rolling size.

Other 2018 Mercedes-Benz GLA250 trims

Mercedes-Benz GLA250 tire sizes by year

See every Mercedes-Benz GLA250 year & trim →

How to read a tire size

A tire size like 225/45R17 breaks down into three parts: the first number is the section width in millimeters (the tire's width from sidewall to sidewall), the second is the aspect ratio — the sidewall's height as a percentage of that width — and the number after the "R" is the rim diameter in inches. A letter prefix (P or LT) indicates Passenger or Light Truck construction; its absence usually means Euro-metric sizing.

Some trucks and off-road tires instead use "flotation" sizing, like 37X12.50R17 — here the numbers are the tire's overall diameter and width in inches directly, with the rim diameter last.

Always verify against the tire information placard on your driver's-side door jamb or your owner's manual before purchasing — tire size can vary by factory option package even within the same trim.