Tire Ratio Calculator
The Tire Ratio Calculator decodes tire size designations and calculates the aspect ratio, sidewall height, overall diameter, and circumference. Compare tire sizes to check speedometer accuracy and ensure proper fitment for your vehicle.
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What is Tire Aspect Ratio?
Tire aspect ratio is the ratio of the tire's sidewall height to its section width, expressed as a percentage. In the tire size 225/45R17, '45' is the aspect ratio — the sidewall height is 45% of the 225mm width, equaling 101.25mm. Lower aspect ratios indicate a shorter sidewall (sportier handling), while higher ratios mean a taller sidewall (more comfort).
Tire aspect ratios typically range from 25 (ultra-low profile racing tires) to 80 (off-road and SUV tires). Standard passenger car tires use 50-65. The aspect ratio, combined with wheel diameter, determines the tire's overall diameter and rolling circumference, which affect speedometer calibration.
Kullanılan Formüller & Denklemler
Bu Tire Ratio Calculator aracı 5 temel denklem kullanır:
1 Sidewall Height ▼
225mm width × 45/100 = 101.25mm sidewall height.
2 Overall Tire Diameter ▼
225/45R17: Diameter = (2 × 101.25) + (17 × 25.4) = 202.5 + 431.8 = 634.3mm = 24.97 inches.
3 Speedometer Error ▼
Going from 634mm to 660mm: Error = (660/634 - 1) × 100 = +4.1%. Speedometer reads slow by 4.1%.
Bu Hesaplayıcı Nasıl Kullanılır?
Bu Oran Hesaplayıcıyı kullanmak için 3 adımı takip edin:
Değerleri Girin
Bilinen oran değerlerini giriş alanlarına yazın. Bir alanı boş bırakın — Oran Hesaplayıcının çözdüğü bilinmeyen değer budur.
Mod Seçin
Oran modunu seçin — Çöz, Basitleştir veya Ölçeklendir. Her mod, giriş değerlerinize farklı denklemler uygular.
Sonuçları Alın
Hesapla'ya tıklayın. Sonuç ekranı, cevabı görsel bir oran çubuğu, pasta grafiği ve adım adım çözüm dökümü ile görüntüler.
Örnek Problemler & Adım Adım Çözümler
İşte bu Oran Hesaplayıcıyı kullanan adım adım çözümlü 3 örnek problem:
Giriş 1 Decode tire size 245/40R18
Giriş 2 Compare 225/45R17 vs 235/40R18
Giriş 3 Find aspect ratio for target diameter
Sıkça Sorulan Sorular
What does the aspect ratio number mean on a tire? ▼
The aspect ratio is the second number in a tire size (e.g., 45 in 225/45R17). It means the sidewall height is 45% of the tire's width. Lower numbers = shorter sidewall, sportier; higher numbers = taller sidewall, more comfortable.
How does tire aspect ratio affect ride quality? ▼
Higher aspect ratios (55-70) provide more rubber between the road and rim, absorbing bumps better. Lower aspect ratios (35-45) are stiffer, providing sharper handling but transmitting more road imperfections to the cabin.
What aspect ratio is best for performance? ▼
Sport/performance tires typically use 35-45 aspect ratio for maximum grip and responsiveness. Track cars may go as low as 25-30. The tradeoff is harsher ride and increased risk of rim damage from potholes.
Can I change tire aspect ratio without changing wheel size? ▼
Yes, but the overall diameter should stay within 3% of original. Going from 225/55R17 to 225/50R17 lowers the car by about 11mm and makes the speedometer read slightly fast.
How much speedometer error is acceptable? ▼
Most jurisdictions allow 3-5% speedometer variance. Keep tire overall diameter within 3% of the factory size. At 3% oversized, your speedometer shows 60 mph when you're actually going 61.8 mph.