We may be arguing semantics here but I wouldn't call what's going on with the yellow z mild at all. I'm pretty conservative with my taste in tires and feel that even the stock sport set-up is too narrow for the wheels provided, so take what I say with a grain of salt.
As for performance, so long as we are talking mild not extreme stretching, its more about preference than simply better over worse.
A slight stretch will give the tread a more flat profile for more steering response, but can make the break away characteristics more abrupt. Essentially one second you will have grip, the next second you don't.
A pinched tire will have more progressive break away characteristics. Its more forgiving, but you lose a bit of steering response.
Last edited by Brendan; 02-26-2015 at 08:27 PM.
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