Rim Width & Aspect Ratio
For example: For tires with aspect ratios from 80 to 50, the measuring rim, also called the design rim, is specified to be 70% of the section width. For tires with an aspect ratio less than 50, the measuring rim is 85% of the section width.
If the rim is too narrow, the flex point moves toward the shoulder area, creating heat buildup in the shoulder, which reduces tire life & could result in failure.
If the rim is too wide, the flex point moves towards the rim area, causing heat buildup in the lower sidewall, which reduces tire life & could result in failure.
Within the acceptable range of rim widths, one can select
wider or narrower rims than the measuring rim. Selection of a wider rim, from
within the approved range, (T & RA tables) stiffens the sidewall & improves
handling at the expense of handling. If carried too extreme, either too narrow
or too wide of a rim, it can result in uneven tread/pavement contact pressure
causing uneven wear & potentially reduced traction, or increased vulnerability
to bead dis-lodgement. Always check with your Dunlop dealer for permissible rim
Wider rims may offer some performance advantages over narrow rims. A wider rim increases the distance between the beads, which results in a straighter sidewall, which stiffens it. This results in quicker steering response & higher cornering forces.
Negatively, the straightened sidewall transmits more road shock to the wheel & suspension, placing greater stress on chassis & suspension parts & delivering a harsher ride. The straighter sidewall exposes the rim, making the wheel more susceptible to damage.
|Avon tires||Dunlop tires||Goodyear tires||Michelin tires||Uniroyal tires|
|BF Goodrich tires||Firestone tires||Hankook tires||Pirelli tires||Yokohama tires|
|Bridgestone tires||Fuzion tires||Hoosier tires||Sumitomo tires||Discount tires|
|Continental tires||General tires||Kumho tires||Toyo tires||Wheels|