Mercedes-Benz GLS
Find Tyres for 2015-2019 Mercedes-Benz GLS (X166)
UK-market tyre sizes for the 2015-2019 Mercedes-Benz GLS, with chassis-code matching and trim notes.
About this generation
Mercedes-Benz fits run-flat tyres on many GLS models, paired with tyre pressure monitoring and no spare wheel. If your car was supplied with run-flats, replacements should typically also be run-flats.
This generation of the GLS runs on 19-inch or larger wheels in some trims, which means short-sidewall tyres that handle precisely but are less forgiving on rough UK roads.
Chassis code: X166. Use the chassis code to confirm you have the right generation when ordering tyres.
Common factory tyre sizes
UK-market factory fitments for the 2015-2019 Mercedes-Benz GLS typically include:
Tyre fitment for any Mercedes-Benz GLS depends on the wheels and trim ordered from new. The most accurate way to confirm a replacement is to read the size from your existing tyre sidewall.
Original-equipment sizes shown here are typical UK fitments. Sport packs, optional alloy upgrades and dealer accessories can change the size — always confirm before fitting.
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Frequently asked questions
Quick answers about UK tyre fitment, MOT rules and seasonal options.
What's different about the 2015-2019 GLS compared with other generations?
This is the 2015-2019 generation of the Mercedes-Benz GLS. Earlier and later generations use different platforms, wheel sizes and tyre fitments, so always match your specific year to the correct generation page.
Can I downsize from larger wheels on my Mercedes-Benz GLS?
Some trims of the GLS can be downsized to a smaller OEM-approved wheel, which often gives better ride and lower tyre cost. Mercedes-Benz usually publishes approved alternative sizes — check the handbook before changing wheel size.
What do star/OEM markings mean on Mercedes-Benz GLS tyres?
Mercedes-Benz approves specific tyres for many of its models, marked with a star (BMW), MO (Mercedes), AO (Audi), J (Jaguar) or similar. OEM-marked tyres are tuned for that car's suspension and don't always come from the major brand-name fitter as a stock item — they may need to be ordered.
Is the Mercedes-Benz GLS still on sale in the UK?
As of the 2015-2019 window, the Mercedes-Benz GLS was on sale in the UK during this period. Tyre fitments listed here reflect UK-market specifications.
What should Mercedes-Benz GLS drivers know about UK potholes?
UK road conditions are tough on tyres. Check sidewall bulges, cuts and tread depth regularly — especially on the inside edge, which often wears unevenly. A 20p coin gives a quick legal-tread check.
Tyre Finder UK provides general tyre guidance only. We do not guarantee tyre fitment, local stock, prices or fitting availability. Always confirm your tyre size, load rating, speed rating and vehicle requirements using your current tyre sidewall, vehicle handbook, manufacturer guidance or a qualified tyre fitter before fitting.