there were a number of reasons why cars started streching tires.
1. in germany (as well as here actually) it is illegal for the tire tread to go outside of the fender. therefore cars with wheels that are typically wider, for looks, had to run a streched tire, because even though the tire sidewall was outside the fender line, the tire tread, the important part was still within the rules.
2. it has been the goal of many a tuner to go wider, as well as lower, strech aides in this persuit, as alot of enthusiasts know, a car with the right stance goes a long way in making itself quite unique, and it can make a car super agressive without having to spend $ on body kits etc. A nice set of wheels with a slammed stance can simply make a car. Johanes Glockenspiel, a true innovator in the vw world started the trend years ago, and here's his story:
http://forums.vwvortex.com/zerothread?id=3119138
3. Strech is available to us that want to go super low without rubbing, it allows you to run a semi wide wheel without having to roll in a 4x4 stance, therefore essentially looking cool, while still being completely functional.
4. stiffer sidewall = better road feeling, you know the limit and can push the car there and feel it when it goes out, rather than most tires that are too big for the wheel where you reach the limit of adheasion and bam your gone, with too much flex in the tire the limit is much harder to find, but with a tight sidewall you can feel it better and faster.
5. looks, vip cars in japan, most old school vw's in europe, big tubbed muscle cars from people like foose and trepanier all run strech in order to minimize the look of the tire while also making the wheel the centerpiece in the car. If you have an expensive set of wheels why clutter them up with a ton of tire, making them look like they don't fit.
And that's about it, to me I persoanlly love the look, love the freedom it gives me to slam a car to the floor, and also drive it daily without too much rubbing.
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