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185/60's work with absolutely no issues at all other than a decrease of mpg, and that's what I have right now. I think Guillermo either uses or has used 195/55's without any problems. I also think that I've heard or read in other posts that a section width of up to 205 will fit the stock rim, but that width may cause some rub issues with the suspension components or the wheel well itself. Even with only going from the 165 section width to the 185 I've noticed a significant improvement in lateral grip, especially at the limit of adhesion (I did my first couple of autocross events on the stock tire size, and finished the season last year with the wider tire and the car felt much better and much more responsive with the wider tire).

Also, one other thing about the tire size, and this is purely my own observation and my not be corroborated by others. With the 185's, I don't know if its the increased friction or what, but the car feels a tad sluggish off the line compared with the stock 165's, which is probably due to the fact that the tires I bought (Sumitomo Srixon 185/60R14) have the larger contact patch and are not low rolling resistance, hence the increase in friction which must take more torque to get going (again, this is a purely non-scientific seat of the pants type of observation).
 

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Thanks Yves. I was focusing on the increased friction part of the equation, but didn't think about the greater mass of the tire essentially requiring more force to put in motion, but that makes sense. Glad someone else has noticed a similar effect, that I'm not the only one!
 
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