The Blizzak LM-50 RFT (Run-Flat) is Bridgestone's Studless Winter tire designed to provide temporary self-supporting run-flat continuing mobility in the case of complete air loss due to a puncture during winter driving exclusively for the drivers of Toyota Sienna vans. Blizzak LM-50 RFT Studless Winter tires allow drivers to maintain their Toyota Sienna's mobility while providing winter driving traction on dry, wet and snow-covered roads.Vehicle ApplicationTire SizeToyota SiennaP225/60R17 98QOn the outside, the Blizzak LM-50 RFT shares the popular Blizzak WS-50's symmetric tread design that features flow-through grooves to help maintain good traction on wet and slush-covered roads while zigzag sipes and independent tread blocks provide the edges to help bite through snow. However, the Blizzak LM-50 RFT exchanges the Blizzak WS-50's Multicell compound for a more robust winter tread compound that can endure the additional stress and heat of being driven when flat. Even though these tires feature a single winter tread compound, they feature "snow platform" tread depth indicators to identify when the tire should be retired from winter service. The Blizzak LM-50 RFT tire's internal structure incorporates run-flat sidewall supports to temporarily carry the load in the event of air loss.Bridgestone's Ultimate Network of Intelligent Tire Technology (UNI-T) brings advanced tire technologies together, taking tire performance to a new level. This combination of innovative tire design, roundness and tread compound maximizes the tire's performance, ride quality and wear.Blizzak LM-50 RFT winter tires meet the industry's severe snow service requirements and are branded with the three-peak mountain snowflake (3PMSF) symbol.Note: Snow platform indicators (the equivalent of snow wear bars) are molded into the LM-50 RFT's tread grooves to inform the driver when ice and snow traction will be reduced as the tire's tread wear reaches the point where the remaining tread depth becomes less effective in deep snow.Install Bridgestone Blizzak LM-50 RFT tires in sets of four only.Due to the traction capabilities of the Blizzak, Bridgestone recommends using Blizzaks only in sets of four to provide the best handling characteristics and tire performance. Related Information: What is the three-peak mountain snowflake symbol (3PMSF)?