F-30/SIPT28 ISSUE
The problem David was referring to is that the Slot.IT F-30s (SIPT28) – with a 2018 Date, seem to be gummy and marble/shed easier than earlier versions. They do not tolerate Lighter-fluid well, for example when dressing the tires before a round or heat. They *look* good in your hand then marble up on the track, taking 3 to 7 laps to shed and then true themselves on the track, (then after 50 laps they started to shed & chunk[1]) While being trued they seem to absorb -and retain- the L/F more than older versions.
The date sticker is on the lower right hand of the hanger-card face, below the label and bar-code. Previous versions did not seem to have a date. King’s last batch of F30s were 2018s.
Many online vendors still have these tires in stock (but you will not know if you are getting the 2018s until you open the shipping box).
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Like Dave, most of my ‘fresh’, bagged F30s are the 2018 versions. They shed dramatically during the 2020 DTM Proxy. After every round they became out-of-true due to lost material [1]. After round-3 my tires were toast.
"... get on your bad motor scooter and ride!"
Sammy with Montrose