<P> Since completely slick tyres are outlawed on most roads due to their inability to handle wet pavement, the "cheater slick" became a popular item in the hot rod world in the 1960s; a typical slick type tyre, but engraved with the absolute minimal amount of tread grooves required to satisfy legal requirements . Since then, however, tyre development has progressed greatly, so that today's hot rod street cars typically use wide, grooved tyres which perform better than the slicks of the past; while the cheater slicks available today, both for nostalgic appearance of street cars and for competition use in classes where DOT approved street tyres are required, have followed their own line of development, diverging from true slick tyre construction to become a distinct tyre design in themselves . </P> <P> The development in cheater slick technology has affected the development of tyres for racing series other than drag racing as well . When other forms of auto racing similarly instituted classes which require DOT approved street tyres, some manufacturers similarly began to market tyres which superficially resembled their high performance street tyres, but with the least tread pattern permissible and with very soft, sticky rubber, intended specifically for competition because the soft tread would wear too quickly for street use . These became known, loosely, as R compound tyres . With additional years of progress, this class of tyre has in its turn followed its own line of development, to the point where they have little in common with true street tyres of the same brand . Ironically, this has led to new classes of racing which require not only DOT approval, but also a minimum treadwear rating, in an effort to eliminate the R compound tyres from competition and require "true" street tyres . </P> <P> In contrast, many bicycle tyres made for street use are slick . Aquaplaning does not present a problem for bicycles due to their narrower width, higher pressure, lower speed, and circular cross section (due to the need to lean the bicycle in turns); the bicycle tyre can penetrate the water layer to contact the road much more easily . In practice, grooved bicycle tyres do not outperform slick tyres on wet roads . However, many low and medium performance bicycle tyres have substantial tread depth, because the bicycles are designed with off - road excursions in mind: in dirt, gravel or sand, the tread pattern provides significantly improved traction . In addition, high - performance bicycle tyres, although designed for road use only, often have a very fine tread pattern, which appears to provide no difference in performance versus a slick tyre and is only there for marketing purposes and as a tyre - wear indicator . This is clear not only from direct testing of tyres, but also from the fact that the texture of the road is itself coarser than the minimal tread pattern on these tyres . Some grooveless designs have small "holes" or dimples embedded in the tread as a tyre - wear indicator . This is similar to automobile tyre - wear indicator bars, which contact the road when the tyre is worn to a low tread amount, making the tyre noisy on the road . </P>

How much water does a f1 tyre disperse