同事有一個自動換算公式，照他算起來，205/50/17的輪胎要改的話應該要改225/45/17
輪週長的差異是最小的。
給大家參考囉！
| | 原始 | 更換後 |
| 胎/圈尺寸 | 205 / 50 / 17 | 215 / 45 / 17 |
| 胎壁厚度(mm) | 102.5 | 96.75 |
| 輪圈直徑(mm) | 431.8 | 431.8 |
| 圈+胎總直徑(mm) | 636.8 | 625.3 |
| 車身高度(mm) | - | 降低 5.75 |
| 圈+胎週長(mm) | 1999.552 | 1963.442
誤差值 1.81% |
時速表之差異
(以原先的圈胎為基準) | - | 真實時速比時速表慢 |
輪上相對速度
(以原先的圈胎為基準) |
100km/hr
110km/hr
120km/hr
130km/hr
140km/hr
150km/hr
160km/hr
170km/hr
180km/hr
190km/hr
200km/hr
210km/hr
220km/hr
230km/hr
240km/hr
| 98.19km/hr
108.01km/hr
117.83km/hr
127.65km/hr
137.47km/hr
147.29km/hr
157.11km/hr
166.93km/hr
176.75km/hr
186.57km/hr
196.39km/hr
206.21km/hr
216.03km/hr
225.85km/hr
235.67km/hr |
| | 原始 | 更換後 |
| 胎/圈尺寸 | 205 / 50 / 17 | 225 / 45 / 17 |
| 胎壁厚度(mm) | 102.5 | 101.25 |
| 輪圈直徑(mm) | 431.8 | 431.8 |
| 圈+胎總直徑(mm) | 636.8 | 634.3 |
| 車身高度(mm) | - | 降低 1.25 |
| 圈+胎週長(mm) | 1999.552 | 1991.702
誤差值 0.39% |
時速表之差異
(以原先的圈胎為基準) | - | 真實時速比時速表慢 |
輪上相對速度
(以原先的圈胎為基準) | 100km/hr
110km/hr
120km/hr
130km/hr
140km/hr
150km/hr
160km/hr
170km/hr
180km/hr
190km/hr
200km/hr
210km/hr
220km/hr
230km/hr
240km/hr
| 99.61km/hr
109.57km/hr
119.53km/hr
129.49km/hr
139.45km/hr
149.41km/hr
159.37km/hr
169.33km/hr
179.29km/hr
189.25km/hr
199.21km/hr
209.18km/hr
219.14km/hr
229.10km/hr
239.06km/hr
|
