Quote:
Originally Posted by l888apex
remember, dropping down to 18's is going to cause you to have to go with something like a 275 or 285/35/18 in front to maintain the proportions of the tire and keep the odometer and speedometer in check.
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Most Speedo's are ~5% fast (show higher that reality). Here in the UK the regulations require that they read between 10% to 0% of the true reading. Going from 265/35/19 to 265/35/18 is less than a 4% change. Chances are, it'll make your Speedo nearer spot on and reduce the rate the Odometer clocks up.
In any case, this is only relevant if you drive them long distances on the road, for dedicated track day tires it doesn't matter. If anything, narrower treads (on the same rim) will stretch the tire more, making the sidewall stiffer and reducing the rolling effect of the tread on the rim giving potentially better handling.