How tyre size maths works
Sidewall = width × aspect/100; overall diameter ≈ rim (mm) + 2×sidewall; circumference ≈ π×diameter. Load/speed indexes may be omitted.
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Lastik Ölçü Hesaplama
205/55R16 gibi ölçüden yanak, çap ve çevre.
Data updated: 2026-08-12
Content updated: 2026-10-22
Sources
- Gelir İdaresi Başkanlığı
- SGK
- Çalışma ve Sosyal Güvenlik Bakanlığı
- EPDK
- Mevzuat Bilgi Sistemi
- CSGB / Asgari Ücret Tespit Komisyonu (2026 brüt/net)
- GİB gelir vergisi tarifesi 2026
- EPDK mesken elektrik kademeli tarife (yaklaşık)
- BOTAŞ / dağıtım şirketleri doğalgaz (yaklaşık)
- Hazine ve Maliye — kıdem tazminatı tavanı 1. dönem 2026
How is it calculated?
This calculator follows Turkish rules. It is not a general international formula.
Yanak = genişlik×(yanak%/100); çap = jant(mm)+2×yanak.
D=2×yanak+jant
Official sources
Calculation methodology Report a wrong result
Bu değerler bilgilendirme amaçlı yaklaşık rakamlardır. Resmi ve güncel kaynakları (Gelir İdaresi, SGK, EPDK, BOTAŞ, CSGB vb.) kontrol edin.
Example
205/55R16.
Guide
Decode sizes like 205/55R16 into sidewall height, overall diameter, and approximate circumference. Informational—follow the vehicle maker and tyre sidewall ratings.
2026 notes and common mistakes
Diameter changes can skew the speedometer. Mixing inch and mm units or ignoring load index is a common error.
Tips
- Compare overall diameter to the OEM size.
- For information only—fitment must match vehicle specs.
Sources: Tyre manufacturer labels · Vehicle manuals · ECE tyre standards
FAQ
Signup needed? +
No. Works without an account.
Official result? +
Informational only; verify official sources.