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Can we use 91W load rated tyres?

My aero currently has the Pzero Rosso's on that are 225/24R17 V speed rating and 94W load rating. Can I use 91W rated tyres safely, or is it just 94W and above. (I think this was discussed some time ago)
 

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I have the same tires as you and my feeling is if you can use the tires thatare reccomended. Some french tire tech told me that if I was to use 91 my car would not conform for an eventual road check... :roll: ?

But I have a question that is coupled to the above. The difference is the load factor but mechanically what is the difference. Does the 94 have stronger tire-walls and if this is the case it means for a firmer tighter drive as one would suppose the lower load rating walls would be more supple? Just a theory.
 
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