ChrisHsu710 wrote:對呀很多店家都說可以
所以我說你說的才是對的正確的資訊讚
我也只是看規格。225/40R18(正確RIM Width Range是7.5J~9J)裝在7J的框,裝上去輪胎到時候的Section Width會比裝在正常的8J框更窄0.4",至於會不會有安全上的疑慮,最好還是請教一下車輛製造商或專業的輪胎行會必較好。
也就是說,215/45R18的Measuring RIM Width是7J,配上原廠7J的框,整體輪胎性能(Tread Width,胎壁抗變形,磨耗等因素)比225/40R18的Measuring RIM Width是8J,配上原廠7J的框,還來的好且恰當。個人淺見,供參考!!
底盤(輪圈,輪胎,懸吊等)零件真是一門學問啊,總之還有5K到安全線,樓主就仔細挑選吧。
PS: 參考https://www.tirerack.com/tires/tiretech/techpage.jsp?techid=198
輪輞寬度範圍
由於輪胎具有柔性側壁,因此單個輪胎尺寸將適合各種輪輞寬度。輪胎的輪輞寬度範圍確定輪胎在其數万英里和數年的使用期間安裝的最窄到最寬的輪輞寬度。
輪輞的寬度將影響輪胎的寬度。安裝在窄輪輞上的輪胎將比相同尺寸的輪胎安裝在寬輪輞上“更窄”。
注意:由於鋼帶徑向的總直徑基本上由鋼帶決定,因為輪輞寬度的差異,輪胎的總直徑幾乎沒有變化。行業經驗法則是,對於輪輞寬度的每1/2“變化,輪胎的截面寬度將相應地改變大約2/10”。
Rim Width Range
Because tires have flexible sidewalls, a single tire size will fit on a variety of rim widths. A tire's rim width range identifies the narrowest to the widest rim widths upon which the tire is designed to be mounted during its tens-of-thousands of miles and years of service.The width of the rim will influence the width of the tire. A tire mounted on a narrow rim would be "narrower" than if the same size tire was mounted on a wide rim.
Note: Because the overall diameter of a steel-belted radial is essentially determined by the steel belts, there is little, if any, change to the overall diameter of the tire due to differences in rim width.
The industry rule of thumb is that for every 1/2" change in rim width, the tire's section width will correspondingly change by approximately 2/10".
99yen wrote:目前還有一個問題是昨天開了4百多km
開起來感覺車會酸 左右偏擺 感覺腳有點軟 沒有紮實的感覺
踢前輪會左右搖晃 踢後輪則不會
不太確定這是不是胎壓問題還是定位間隙的問題?又或是硬裝7J的問題?
胎壓是前38後36
原廠215 45 18建議值是前35後33,我後來都習慣打前36後34
沒有酸的問題 行車很穩定
請問大大是從Dunlop Sport Maxx TT 215/45R18 89W 換成 Goodyear F1A3 225/40R18 92W XL嗎!?可以參考,
淺談 XL胎 和 非XL胎(SL胎) 的冷車胎壓設定的小小差異
215/45R18 89W XL 35/33 PSI 荷重 1235/1202 Pound (原廠建議荷重)
215/45R18 89W XL 36/34 PSI 荷重 1279/1215 Pound (後來都習慣荷重)
225/40R18 92W XL 38/36 PSI 荷重 1268/1235 Pound (換胎後荷重,開起來感覺車會酸 左右偏擺 感覺腳有點軟 沒有紮實的感覺)
225/40R18 92W XL 36/35 PSI 荷重 1235/1190 Pound (前軸和原廠建議一樣荷重)
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