More and more luxury models equipped with the start of a run-flat tires, which is what we commonly known as “runflat” tires, in fact, a more accurate description is a run-flat tire. Today we test specifications for the 225/55 R17, not only the previous generation BMW 5 Series, 3 Series universal size, it is also used by many ordinary sedan models, so the content of the current period to replace the original anti-puncture may or It is to upgrade the original car ordinary tire friends to help.
The four tires of this test are as follows:The new Pirelli P7 RF, Ma licensing CPC2 SSR, Bridgestone ER300 RFT, Ruckus Hallmark V105S RF. While each brand identification and description for runflat different, but they all belong to the run-flat tire. Compared with ordinary tires, run-flat tire pressure can be lost when still traveling a certain distance at a certain speed tires, no immediate need to change the tire, safer and more convenient; and because not need a spare tire, body weight and space can also be obtained optimization.
Four tire presentation
New Pirelli P7 R-F
Horse brand CPC2 SSR
Bridgestone ER300 RFT
Ruckus Hallmark V105S RF
Because the four tires are run-flat tire (run-flat tire), since both support the tread reinforcing rubber inside the wall, and therefore greater than the weight of a normal tire, while the hardness of the tread and sidewall is also relatively high . Ruckus Hallmark V105S is a comprehensive four tires maximum hardness can be enhanced supportive. Pirelli P7 and German horse brand new CPC2 moderate hardness in the four tires. Weight, the hardest Ruckus Hallmark but the lightest, the German horse brand CPC2 weight is also good, have the advantage of handling and fuel economy. Bridgestone ER300 maximum weight, but also more carcass layers.
Dynamic testing Introduction
Interior noise test
As a luxury car standard run-flat tires, without loss of comfort, but also can enhance the security and sense of control. Pirelli P7 and new Bridgestone ER300 are many brands of Original model reflects a good balance, but the price is relatively high; the German horse brand CPC2 in product performance is relatively good, Ruckus Hallmark V105S at the lowest price case also provides a good performance, especially the grip and rolling resistance has a good performance, more cost-effective. It can be said either select manufacturers Original model, or choose other big brand products will not be very different, mainly your driving environment is required run-flat tires.