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2021 Daihatsu Copen tire sizes & fitment

Approved tire and wheel sizes for the 2021 Daihatsu Copen, sourced from manufacturer fitment data and refreshed monthly.

Approved fitments

Tire size Rim size PCD (bolt pattern) Offset Load index Speed rating
165/50R16 OEM 4.5x16 N/A 45mm 75 V
165/50R15 5x15 N/A 40mm 75 V
185/45R15 6x15 N/A 38mm 75 V

Compatible alternative sizes for 165/50R16

Sizes within the ETRTO ±3% overall-diameter safe-fit tolerance. Each row links to the size's own page.

Alternative size%Δ ODCategoryVerdict
155/45R17 -0.02% plus 1 Safe
175/40R17 0.07% plus 1 Safe
155/70R14 0.21% alternative Safe
165/35R18 0.23% plus 2 Safe
165/65R14 -0.23% alternative Safe

For the full list of alternatives with comfort/handling impact, see 165/50R16 upsize options. To check an arbitrary size pair, use the tire compatibility calculator.

Check a different size against this vehicle

Type any tire size below — we'll compute its overall-diameter delta against the OEM 165/50R16 and verdict using the ETRTO ±3% rule.

Common upgrade paths

Use the plus-size calculator to evaluate any rim step against the OEM size.

How to choose tires for the 2021 Daihatsu Copen

The 2021 Daihatsu Copen ships from the factory on 165/50R16 tires mounted on 4.5x16 wheels, with a load index of 75 and a speed rating of V. 3 approved fitments are documented for this model year, allowing some flexibility between performance, comfort, and winter compounds. The Compatible alternative sizes table above lists every safe substitution within the ETRTO ±3% overall-diameter tolerance.

Tire choice on the Daihatsu Copen comes down to three trade-offs that matter more than brand loyalty: load index (must equal or exceed the OEM number, in this case 75), speed rating (must match or exceed the placard, here V), and UTQG treadwear (higher means longer life, lower usually means stickier rubber). Owners replacing factory tires with the same compound class, for example all-season for all-season, generally see no change in ride characteristics or fuel economy. Switching categories (performance summer to all-season touring, for example) is where the trade-offs show up at the contact patch.

For 2021 Daihatsu Copen owners considering a plus-size upgrade, the safer option is a Plus-1 step (one rim size up with a 10-point aspect drop and ~10 mm of additional section width). Plus-2 is technically viable on this chassis if the alternative-sizes table lists a Plus-2 candidate within tolerance, but expect a meaningful ride-harshness penalty and a tire-cost premium of 30–60% per tire relative to the OEM fitment. For winter use the recommended pattern is one width step down (e.g. from a 235 to a 225) with the aspect ratio bumped up to preserve overall diameter — narrower tires apply higher contact pressure per square inch on snow, which translates directly into shorter braking distances. The plus-size calculator evaluates any specific rim step against this OEM size.

Before purchasing, verify the tire size on the driver-door placard of your specific 2021 Daihatsu Copen, since trim levels and option packages can shift the original fitment from what is documented here. The placard reading is the authoritative source per FMVSS 110, and dealers will reference the placard rather than aftermarket catalogs when validating warranty claims.

Frequently asked questions

What size tires fit a 2021 Daihatsu Copen?
The OEM tire size for the 2021 Daihatsu Copen is 165/50R16 mounted on 4.5x16 wheels. Load index 75, speed rating V. Trim levels and option packages can shift the original fitment — confirm against your specific vehicle's driver-door placard before purchase.
Can I run a different tire size on my 2021 Daihatsu Copen?
Plus-sizing (larger rim, lower aspect) is possible within ±3% of the OEM overall diameter per the ETRTO safe-fit standard. The Compatible alternative sizes table on this page lists every safe option for the OEM size. Always confirm with the manufacturer or a qualified tire shop before deviating from the placard.
Where can I buy tires for my 2021 Daihatsu Copen?
Online tire retailers in our affiliate network carry every size documented for this vehicle. Use the Shop online buttons above to compare prices across them — variance of $20–$40 per tire is common between merchants. The <a href="/tools/tire-install-cost-calculator/">install cost calculator</a> estimates the out-the-door including mount, balance, TPMS, and disposal by state.
What is the recommended tire pressure for the 2021 Daihatsu Copen?
The cold-inflation pressure is printed on the driver-door placard of your specific vehicle and varies by trim, tire size, and loaded vs unloaded condition. Typical OEM front and rear pressures fall between 30 and 36 psi for passenger trims and 32–40 psi for SUV/truck variants, but the placard is the authoritative source.
Can I fit winter tires in a different size on my 2021 Daihatsu Copen?
Yes — the standard winter-tire fitment pattern is one width step narrower than OEM (e.g. 225 → 215) with the aspect ratio bumped up to preserve overall diameter. Narrower tires increase contact pressure on snow for better traction. The Compatible alternative sizes table includes any winter-friendly options that fall within ±3% OD for this vehicle.
How often should I rotate the tires on my 2021 Daihatsu Copen?
Every 5,000–7,500 miles is the typical OEM recommendation for passenger vehicles. AWD vehicles and high-torque trucks benefit from the shorter interval. Documented rotation history is also a tire-warranty prerequisite — most manufacturer treadwear claims require rotation receipts at the warranty inspection.

Sources for this page

  1. Vehicle owner's manual tire & wheel placard — door-jamb placard on the Daihatsu Copen is the authoritative source for OEM tire size, load index, and cold-inflation pressure for your specific trim.
  2. NHTSA SaferCar — recall lookup for the 2021 Daihatsu Copen.
  3. ETRTO 2024 Standards Manual §2.3 — overall-diameter math used for the alternative-size verdicts above.
  4. Tire & Rim Association 2025 Yearbook — load-index to maximum-load reference.

Last verified 2026-05-17.