soft track = soft tire
hard track = hard tire
(for the most part anyhow.)
If a track surface is abrasive, then you need a harder tire to handle the heat and wear that the tire will incur.
Soft & moist tracks that are less abrasive allow you to use a softer tire before wearing the tire excessively.
A recently cut up track, rain shower, or run-away water truck before you hit the track would be a good time to go with a softer tire - or any time that you are unable to build heat (or see some graining-wear) in a harder tire.
Be careful with durometer readings though (especially with thin rubber tires.) If the needle is able to touch the cords or webbing of the tire, it will give you a false reading. Also keep in mind that rubber will duro softer when it's warm than when cold. A tire checked @ 80*F ambient air temp. will most certainly duro softer than one checked @ 50*F.
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?Thanks and God bless,
Brian Carlson
Carlson Racing Engines
Vector Cut
z
www.CarlsonMotorsports.com
30 years of service to the karting industry
215 N. High St.
Linden, IN 47955
765-339-4407
bcarlson@CarlsonMotorsports.com