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Silly Girl ? about Tire Speed Rating ??

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tire
1.2K views 2 replies 3 participants last post by  Mike Hippert  
#1 ·
I have a question about Tire Speed Rating. What is a better ratio for a Rover? 109S or say 108/104S ? I am not sure what the dash behind the 108 is for after the last example? Could someone better explain this to me? I understand for the most part that S and R stand for how fast you can go however I am still unsure of why some tires have for example the 108/104. Thanks in advance for helping me with this conundrum!
 
#2 ·
S is the speed rating for the tire. The two examples you provided are both "S" rated tires which means they are rated up to 112 mph. "109" and "108/104" probably refer to the Load Index. A tire with a load index of "109" can support 2271 lbs, "108" can support 2205 lbs and "104" can support 1984 lbs.