Tire Size Calculator
Kuenzanisa maviri tire marudzi: diameter, circumference uye speedometer matambudziko.
Zvinyorwa zvinogadziridzwa paunenge uchinyora.
Nezve iyi kalkulator
A tire size calculator compares two tires written in the standard P-metric format (for example 205/55R16) — the section width in millimetres, the aspect ratio as a percentage of that width, and the rim diameter in inches. It computes each tire’s overall diameter as the rim plus twice the sidewall height, the rolling circumference, and the percentage difference between the two.
Worked example: a 205/55R16 has a sidewall of 205 × 0.55 = 112.75 mm, so its diameter is 16 × 25.4 + 2 × 112.75 = 406.4 + 225.5 = 631.9 mm. A 225/45R17 has a 101.25 mm sidewall and a diameter of 431.8 + 202.5 = 634.3 mm — about 0.4% taller.
Because a speedometer is geared to the original tire, fitting a taller or shorter tire makes the reading wrong in proportion to the diameter change; at an indicated 60 mph the taller tire above means a true speed near 60.2 mph. Keep the difference under about 3% to stay within speedometer tolerance and avoid rubbing or gearing problems — which is exactly what drivers use this for when plus-sizing wheels or fitting winter tires.
Zvimwe zvinobvunzwa zvakanyanya
Ndezvipi zvinhu zvinokonzera kuti mvura iite seyakaomarara?
A shanduko mu total diameter pasi pemakore 3% inochengeta speedometer mukati tolerance uye anodzivirira kusvibiswa kana gearing matambudziko. The calculator inotaura zvakajeka muzana kuti iwe unogona kuongorora swap.
Sei bigger tire kukonzera yangu speedometer?
Speedometer inobata mabhatiri emotokari anobata nechivharo chemotokari. A higher tire travels further per turn, so you are actually going faster than the dial shows; a shorter tire does the reverse. The calculator gives the true speed at a indicated 60 mph.
Chii chinonzi 205/55R16?
205 ndiyo hupamhi hwekutenderera mumilimita, 55 ndeyekukwira kwechigaro sechikamu chekukwira kwehupamhi (so 55% ye205 ≈ 113 mm), R zvinoreva radial construction, uye 16 ndeyekutenderera kwechigaro muinches.
Chii chinonzi plus-sizing tire?
Plus-sizing inokwana kureba-diameter wheelchair neyakaderera-profile tire saka kuwanda-diameter inoramba pamusoro peimwe - a "plus imwe" kana "plus maviri" swap. Kuchengeta kuwanda-diameter mukati me3% yemari inochengeta speedometer kunyatsoita uye gearing apo kuchinja kutaridzika uye kudzora.
Kana ndichizoisa bhasikoro rine kureba kwakawanda, ndichaita sei kuti bhasikoro rirambe riine kureba kwakafanana?
Lower the tire’s aspect ratio (a thinner sidewall) and often widen it slightly to compensate. Moving from a 16-inch to a 17-inch rim, dropping the profile from 55 to 45 keeps the diameter almost identical, as the worked example shows.
Inogona sei tairi yakareba kuita kuti speedometer yangu iverenge zvakanyanya kana kuti zvishoma?
A makuru tire kufamba kure per revolution, saka iwe uri chaizvo kuenda nekukurumidza kupfuura dial zvinoratidzwa - speedometer anoverenga pasi. A pfupi tire iri reverse, kuverenga high. The calculator inopa chokwadi speed pa 60 mph zvinoratidzwa kuti swap.
API — kushandisa iyi kalkulator kubva code
Nhare iyi calculator semahara JSON endpoint - hapana chikuru zvinodiwa. Kutumira nzvimbo mavara pasi separameter query kana JSON. Chii zvachose chaunoisa kunze chinoshandisa default iyo peji iri rakasviba nayo; parameter isiri yechokwadi inonzi 400, uye haisi zero. Tora yakazara API docs →
Endpoint
GET https://calculator.free/api/v1/tire-size/curl
curl "https://calculator.free/api/v1/tire-size/?w1=205&a1=55&r1=16&w2=225&a2=45&r2=17"JavaScript fetch()
const r = await fetch(
"https://calculator.free/api/v1/tire-size/?" + new URLSearchParams({
"w1": "205",
"a1": "55",
"r1": "16",
"w2": "225",
"a2": "45",
"r2": "17"
}));
const data = await r.json();
console.log(data.results);Zviratidzo zvemubvunzo ndezvekufungidzira kwechinangwa chekudzidzisa chete, kwete zvemari, zvehutano kana zvemari.