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Mercedes-Benz SLS tire upsize & plus-size guide

Every safe upsize, plus-size, wider, and winter-narrower option for the Mercedes-Benz SLS; covering all 2 of its factory tire sizes, each inside the ETRTO ±3% overall-diameter tolerance, with speedometer impact and catalog availability per size.

By Mark Bishop · Last verified 2026-05-17 · Mercedes-Benz SLS fitment specs

This guide takes the factory tire sizes of the Mercedes-Benz SLS and shows every geometrically valid alternative; the plus-sizes that fill the wheel arch, the wider sizes that add grip, and the narrower winter sizes that bite through snow. All math is derived from the ±3% ETRTO safe-fit rule, not scraped listings.

265/35R19; factory fitment (2011–2015)

Overall diameter 668.1 mm (26.30 in). Alternatives below are grouped by upgrade intent; every one is inside the ±3% safe-fit envelope for this size.

Plus-1 (next rim size up)

Plus-1 keeps overall diameter constant while bumping rim diameter by one inch and dropping aspect ratio by ten points. The standard daily-driver upgrade; sharper steering response, mild ride penalty, modest tire-cost premium.

SizeOD (mm)%ΔTrue @ 60 mphVerdictIn catalog
265/30R20 667 -0.16% 59.90 mph Safe Yes
235/35R20 673 0.66% 60.40 mph Safe Yes
275/30R20 673 0.73% 60.44 mph Safe -
255/30R20 661 -1.06% 59.36 mph Within tolerance Yes
285/30R20 679 1.63% 60.98 mph Within tolerance Yes
245/35R20 680 1.71% 61.02 mph Within tolerance -
295/25R20 656 -1.89% 58.87 mph Within tolerance -
245/30R20 655 -1.96% 58.82 mph Within tolerance -
295/30R20 685 2.53% 61.52 mph Within tolerance Yes
285/25R20 651 -2.63% 58.42 mph Within tolerance -
255/35R20 687 2.75% 61.65 mph Within tolerance -
235/30R20 649 -2.86% 58.28 mph Within tolerance -

Plus-2 (two rim sizes up)

Plus-2 lifts rim diameter by two inches with a twenty-point aspect drop. Noticeable ride penalty, higher pothole risk, and a meaningful tire-cost premium. Suitable for performance trims and aesthetic upgrades.

SizeOD (mm)%ΔTrue @ 60 mphVerdictIn catalog
265/25R21 666 -0.33% 59.80 mph Safe -
275/25R21 671 0.42% 60.25 mph Safe -
235/30R21 674 0.94% 60.57 mph Safe -
255/25R21 661 -1.08% 59.35 mph Within tolerance -
285/25R21 676 1.17% 60.70 mph Within tolerance -
245/25R21 656 -1.83% 58.90 mph Within tolerance -
245/30R21 680 1.84% 61.10 mph Within tolerance -
295/25R21 681 1.92% 61.15 mph Within tolerance -
235/25R21 651 -2.57% 58.46 mph Within tolerance -
255/30R21 686 2.74% 61.64 mph Within tolerance -

Same rim, wider footprint

Same rim diameter as your OEM, just a wider footprint. Increases grip and footprint contact at the cost of fuel economy and steering effort. Confirm fender clearance at full lock before purchase.

SizeOD (mm)%ΔTrue @ 60 mphVerdictIn catalog
275/35R19 675 1.05% 60.63 mph Within tolerance Yes
295/30R19 660 -1.27% 59.24 mph Within tolerance Yes
285/35R19 682 2.10% 61.26 mph Within tolerance Yes
285/30R19 654 -2.17% 58.70 mph Within tolerance -

Winter / narrower contact

Narrower than OEM, aspect ratio raised to preserve overall diameter. Higher contact pressure improves snow and slush bite; the Nokian-style rule of one width step down for winter on the same overall diameter.

SizeOD (mm)%ΔTrue @ 60 mphVerdictIn catalog
235/45R18 669 0.09% 60.05 mph Safe Yes
235/40R19 671 0.37% 60.22 mph Safe Yes
255/40R18 661 -1.03% 59.38 mph Within tolerance Yes
255/35R19 661 -1.05% 59.37 mph Within tolerance Yes
245/45R18 678 1.44% 60.86 mph Within tolerance Yes
245/40R19 679 1.57% 60.94 mph Within tolerance Yes
245/35R19 654 -2.10% 58.74 mph Within tolerance Yes
245/40R18 653 -2.23% 58.66 mph Within tolerance Yes
255/40R19 687 2.77% 61.66 mph Within tolerance Yes
255/45R18 687 2.78% 61.67 mph Within tolerance -

Other geometric alternatives

Geometrically valid alternatives that don't fit a named category. Often combinations of rim and aspect change that happen to land in tolerance.

SizeOD (mm)%ΔTrue @ 60 mphVerdictIn catalog
295/40R17 668 -0.04% 59.97 mph Safe -
265/40R18 669 0.16% 60.10 mph Safe -
235/50R17 667 -0.19% 59.88 mph Safe -
265/45R17 670 0.33% 60.20 mph Safe -
295/35R18 664 -0.66% 59.60 mph Safe -
255/45R17 661 -1.02% 59.39 mph Within tolerance -
285/40R17 660 -1.24% 59.25 mph Within tolerance -
245/50R17 677 1.30% 60.78 mph Within tolerance -
275/40R18 677 1.36% 60.82 mph Within tolerance -
275/45R17 679 1.68% 61.01 mph Within tolerance -
285/35R18 657 -1.71% 58.98 mph Within tolerance -
245/45R17 652 -2.36% 58.58 mph Within tolerance -
275/40R17 652 -2.44% 58.54 mph Within tolerance -
285/40R18 685 2.56% 61.54 mph Within tolerance -
275/35R18 650 -2.75% 58.35 mph Within tolerance Yes
255/50R17 687 2.80% 61.68 mph Within tolerance -

275/35R19; factory fitment (2014)

Overall diameter 675.1 mm (26.58 in). Alternatives below are grouped by upgrade intent; every one is inside the ±3% safe-fit envelope for this size.

Plus-1 (next rim size up)

Plus-1 keeps overall diameter constant while bumping rim diameter by one inch and dropping aspect ratio by ten points. The standard daily-driver upgrade; sharper steering response, mild ride penalty, modest tire-cost premium.

SizeOD (mm)%ΔTrue @ 60 mphVerdictIn catalog
275/30R20 673 -0.31% 59.81 mph Safe -
285/30R20 679 0.58% 60.35 mph Safe Yes
245/35R20 680 0.65% 60.39 mph Safe -
265/30R20 667 -1.20% 59.28 mph Within tolerance Yes
295/30R20 685 1.47% 60.88 mph Within tolerance Yes
255/35R20 687 1.69% 61.01 mph Within tolerance -
255/30R20 661 -2.09% 58.75 mph Within tolerance Yes
305/25R20 661 -2.16% 58.70 mph Within tolerance -
305/30R20 691 2.36% 61.41 mph Within tolerance Yes
265/35R20 694 2.73% 61.64 mph Within tolerance Yes
295/25R20 656 -2.90% 58.26 mph Within tolerance -
245/30R20 655 -2.98% 58.21 mph Within tolerance -

Plus-2 (two rim sizes up)

Plus-2 lifts rim diameter by two inches with a twenty-point aspect drop. Noticeable ride penalty, higher pothole risk, and a meaningful tire-cost premium. Suitable for performance trims and aesthetic upgrades.

SizeOD (mm)%ΔTrue @ 60 mphVerdictIn catalog
285/25R21 676 0.12% 60.07 mph Safe -
275/25R21 671 -0.62% 59.63 mph Safe -
245/30R21 680 0.79% 60.47 mph Safe -
295/25R21 681 0.86% 60.52 mph Safe -
265/25R21 666 -1.36% 59.18 mph Within tolerance -
305/25R21 686 1.60% 60.96 mph Within tolerance -
255/30R21 686 1.67% 61.00 mph Within tolerance -
255/25R21 661 -2.10% 58.74 mph Within tolerance -
265/30R21 692 2.56% 61.54 mph Within tolerance -
245/25R21 656 -2.84% 58.29 mph Within tolerance -

Same rim, wider footprint

Same rim diameter as your OEM, just a wider footprint. Increases grip and footprint contact at the cost of fuel economy and steering effort. Confirm fender clearance at full lock before purchase.

SizeOD (mm)%ΔTrue @ 60 mphVerdictIn catalog
285/35R19 682 1.04% 60.62 mph Within tolerance Yes
305/30R19 666 -1.41% 59.16 mph Within tolerance Yes
295/35R19 689 2.07% 61.24 mph Within tolerance -
295/30R19 660 -2.30% 58.62 mph Within tolerance Yes

Winter / narrower contact

Narrower than OEM, aspect ratio raised to preserve overall diameter. Higher contact pressure improves snow and slush bite; the Nokian-style rule of one width step down for winter on the same overall diameter.

SizeOD (mm)%ΔTrue @ 60 mphVerdictIn catalog
245/45R18 678 0.39% 60.23 mph Safe Yes
245/40R19 679 0.52% 60.31 mph Safe Yes
265/40R18 669 -0.87% 59.48 mph Safe -
265/35R19 668 -1.04% 59.38 mph Within tolerance Yes
255/40R19 687 1.70% 61.02 mph Within tolerance Yes
255/45R18 687 1.72% 61.03 mph Within tolerance -
255/40R18 661 -2.06% 58.76 mph Within tolerance Yes
255/35R19 661 -2.07% 58.76 mph Within tolerance Yes
265/40R19 695 2.89% 61.73 mph Within tolerance -

Other geometric alternatives

Geometrically valid alternatives that don't fit a named category. Often combinations of rim and aspect change that happen to land in tolerance.

SizeOD (mm)%ΔTrue @ 60 mphVerdictIn catalog
305/40R17 676 0.10% 60.06 mph Safe -
245/50R17 677 0.25% 60.15 mph Safe -
275/40R18 677 0.31% 60.19 mph Safe -
275/45R17 679 0.62% 60.37 mph Safe -
305/35R18 671 -0.65% 59.61 mph Safe -
265/45R17 670 -0.71% 59.57 mph Safe -
295/40R17 668 -1.08% 59.35 mph Within tolerance -
285/40R18 685 1.50% 60.90 mph Within tolerance -
295/35R18 664 -1.69% 58.99 mph Within tolerance -
255/50R17 687 1.73% 61.04 mph Within tolerance -
285/45R17 688 1.96% 61.17 mph Within tolerance -
255/45R17 661 -2.04% 58.77 mph Within tolerance -
285/40R17 660 -2.27% 58.64 mph Within tolerance -
295/40R18 693 2.68% 61.61 mph Within tolerance -
285/35R18 657 -2.73% 58.36 mph Within tolerance -

Which upsize path fits your priorities?

Every option on this page is inside the ETRTO ±3% overall-diameter tolerance, so any of them is mechanically safe on the factory rim geometry. The difference is what each trades. Use this to pick the category, then read the verdict table above for the exact sizes.

CategoryRide comfortHandlingFuel economyRoad noiseTire cost
Plus-1Slightly firmerSharper≈ neutral≈ neutralModest premium
Plus-2FirmerSharpestSlightly worseSlightly higherHigher premium
Wider (same rim)≈ neutralMore gripSlightly worseSlightly higherModest premium
Winter narrowerSofterSofter dry≈ neutralLower≈ neutral
Narrower (same rim)SofterLess gripBetterLowerOften cheaper
OEM-equivalent≈ OEM≈ OEM≈ OEM≈ OEM≈ OEM

"≈" means no meaningful change versus the factory size. Comfort and noise assume the same tire model and load rating; switching brand or category (touring → performance) usually moves these more than the size change does.

Winter setup for the Mercedes-Benz SLS

For winter, the European engineering rule is to step down one width while raising aspect ratio to hold the same overall diameter; the "Winter / narrower contact" rows in the table above. A narrower footprint concentrates the vehicle's weight over less rubber, raising contact pressure so the tread bites through snow and slush instead of floating on it. Keep the overall diameter within ±3% of 265/35R19 so ABS, TPMS, and (on AWD trims) the center coupling stay inside their factory calibration. Fit four matching winter tires, never two.

Related pages

FAQ

Can I put bigger tires on my Mercedes-Benz SLS?
Yes; within limits. Any size in the tables above is inside the ETRTO ±3% overall-diameter tolerance, which keeps speedometer, TPMS, and ABS calibration intact. The Plus-1 category is the standard bigger-wheel upgrade; Plus-2 is the aesthetic/performance maximum. Sizes beyond ±3% are excluded because they push those systems out of factory range and can rub at full steering lock.
What is the OEM tire size for the Mercedes-Benz SLS?
The Mercedes-Benz SLS shipped with 2 distinct factory tire sizes across its years and trims; each is listed above as its own section with the alternatives for that size. 265/35R19 is the most common. Check the door-jamb placard or your owner's manual for your specific year and trim.
Will bigger tires hurt my Mercedes-Benz SLS's fuel economy or ride?
Plus-1 is close to neutral on both. Plus-2 and wider sizes add rotating mass and footprint, which costs a little fuel economy and ride comfort for sharper steering and grip. The decision matrix above shows the trade-off per category. Staying within ±3% overall diameter means the transmission and speedometer are unaffected.
Do I need new wheels to change tire size on my Mercedes-Benz SLS?
Not for same-rim changes (wider, narrower, winter-narrower keep your factory rim diameter). Plus-1 and Plus-2 raise rim diameter and require wheels in the new diameter with a compatible bolt pattern and offset; check the wheel bolt-pattern page linked below before buying.

Sources & methodology

Last verified 2026-05-17 against the standards below.

  1. ETRTO 2024 Standards Manual §2.3 (section width, aspect ratio, overall diameter formula). European Tyre and Rim Technical Organisation, Brussels.
  2. SAE J1349 (speedometer accuracy reference envelope).
  3. NHTSA FMVSS 138 Tire Pressure Monitoring Systems; rev/mile calibration requirements.
  4. Tire Industry Association Technical Bulletin TB-2019-04 (plus-sizing guidance).
  5. Nokian Tyres "Why winter tyres should be narrower" technical bulletin, 2019.