Tirefolio Find my fitment

Daihatsu cast style tire upsize & plus-size guide

Every safe upsize, plus-size, wider, and winter-narrower option for the Daihatsu Cast Style; covering its factory tire size, each inside the ETRTO ±3% overall-diameter tolerance, with speedometer impact and catalog availability per size.

By Mark Bishop · Last verified 2026-05-17 · Daihatsu Cast Style fitment specs

This guide takes the factory tire size of the Daihatsu Cast Style 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.

165/55R15; factory fitment (2015–2023)

Overall diameter 562.5 mm (22.15 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
195/40R16 562 -0.02% 59.99 mph Safe -
155/50R16 561 -0.20% 59.88 mph Safe -
175/45R16 564 0.25% 60.15 mph Safe -
165/45R16 555 -1.35% 59.19 mph Within tolerance -
185/40R16 554 -1.44% 59.14 mph Within tolerance -
165/50R16 571 1.58% 60.95 mph Within tolerance -
185/45R16 573 1.85% 61.11 mph Within tolerance -
155/55R16 577 2.56% 61.54 mph Within tolerance -
175/40R16 546 -2.86% 58.28 mph Within tolerance -
155/45R16 546 -2.95% 58.23 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
185/35R17 561 -0.21% 59.87 mph Safe -
165/40R17 564 0.23% 60.14 mph Safe -
195/35R17 568 1.03% 60.62 mph Within tolerance -
155/40R17 556 -1.19% 59.29 mph Within tolerance -
175/35R17 554 -1.46% 59.13 mph Within tolerance -
155/45R17 571 1.56% 60.94 mph Within tolerance -
175/40R17 572 1.65% 60.99 mph Within tolerance -
165/35R17 547 -2.70% 58.38 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
185/50R15 566 0.62% 60.37 mph Safe -
195/45R15 557 -1.07% 59.36 mph Within tolerance -
175/50R15 556 -1.16% 59.31 mph Within tolerance -
175/55R15 574 1.96% 61.17 mph Within tolerance -
195/50R15 576 2.40% 61.44 mph Within tolerance -
185/45R15 548 -2.67% 58.40 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
155/60R15 567 0.80% 60.48 mph Safe -
155/65R14 557 -0.96% 59.42 mph Safe -
155/70R14 573 1.80% 61.08 mph Within tolerance -
155/55R15 552 -1.96% 58.83 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
155/75R13 563 0.04% 60.02 mph Safe -
165/70R13 561 -0.23% 59.86 mph Safe -
195/60R13 564 0.30% 60.18 mph Safe -
175/60R14 566 0.55% 60.33 mph Safe -
185/55R14 559 -0.60% 59.64 mph Safe -
175/65R13 558 -0.85% 59.49 mph Safe -
165/65R14 570 1.35% 60.81 mph Within tolerance -
195/55R14 570 1.35% 60.81 mph Within tolerance -
185/65R13 571 1.46% 60.87 mph Within tolerance -
165/60R14 554 -1.58% 59.05 mph Within tolerance -
185/60R13 552 -1.83% 58.90 mph Within tolerance -
195/50R14 551 -2.12% 58.73 mph Within tolerance -
175/70R13 575 2.26% 61.35 mph Within tolerance -
175/55R14 548 -2.56% 58.46 mph Within tolerance -
185/60R14 578 2.68% 61.61 mph Within tolerance -
165/75R13 578 2.70% 61.62 mph Within tolerance -
155/70R13 547 -2.72% 58.37 mph Within tolerance -
165/50R15 546 -2.93% 58.24 mph Within tolerance -
165/60R15 579 2.93% 61.76 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 Daihatsu Cast Style

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 165/55R15 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 Daihatsu Cast Style?
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 Daihatsu Cast Style?
The Daihatsu Cast Style we cover shipped with 165/55R15 as its factory size. Always confirm against your door-jamb placard, as trims and options can change it.
Will bigger tires hurt my Daihatsu Cast Style'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 Daihatsu Cast Style?
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.