Riepas ielai un trasei

Tirerack (Extreeme performance, US) http://www.tirerack.com/tires/types/extremeperf.jsp
Tirerack (Max performance, US) http://www.tirerack.com/tires/types/maxperf.jsp

Demon-tweeks (Competition, UK) http://www.demon-tweeks.co.uk/Motorsport/Wheels_&_Tyres/Competition_Tyres/1790
Demon-tweeks (Performance, UK) http://www.demon-tweeks.co.uk/Performance/Tyres/1725

Tirereviews (Track & Competition, UK) http://www.tyrereviews.co.uk/Type/Track-and-Competition-DOT/
Tirereviews (Ultra-High-Performance, UK) http://www.tyrereviews.co.uk/Type/Ultra-High-Performance/

Autobild trackday tyre test http://www.tyrereviews.co.uk/Article/autobild-trackday-tyre-review.htm

http://www.timeattackforums.com/forums/wheels-tires/

Yoko S.drive vs Dunlop Direzza vs Kumho KU31

Car and Driver: PS2 VS cheaper alternatives (Kumho XS best in Dry, Hankook V12 Evo - v.good in both dry & wet)

Novērojums par "Street" klases riepām - 2500+ klasē Aizkalns dabūja otro vietu ar "Kormoran Gamma B2". Riepas cena ir smieklīga (piemēram, 195/50R15 var dabūt par 26 lvl), bet no malas izskatījās, ka turas labi. Un arī zīmējums šķiet piemērots asfaltam.