TIRES FOR THE HSARC TRACK
C1 compound tires are standard OEM on many Slot.ITs
Using a magnifying glass on the branded (e.g goodyear, firestone, pirelli …) OEM tires you will find many of them are PT1159s, which has a C1 compound, and close to the same size as the PT28(F30)s. PT1159C1 9.5 W x 17.2 D (should be tight even without glue)
as compared to the PT28(F30) 10 W x 19.5 D
Most of us have these C1 spare tires rattling around in our pitboxes, unless we trashed them or used them on static models. These can be glued with CA, rubberized black CA, or ShoeGoo.
OTHER C1 TIRES THAT MAY BE IN YOUR SPARES:
PT1228C1 9.5 W x 17.8 D
PT35 (1140) 9.5 W x 19.8 D
PT34 (1145) 10 W x 18.5 D
PT2121C1 (1121 = 10 x 19.5) same size as F30
SLOT.IT NUMBERING SCHEMES: Slot.IT part numbers often, but not always, are the 4-digit Drawing aka Mold number. Some part numbers seem to have no meaning (e.g. PT28, PT34) while others include the compound (e.g. PT1228C1, PT1172N22).
The “C” in the compound name is for Carerra; Tires with a “P” in their compound name (P1, P6) the “P” is for plastic (or Perspex) as in Scalextric, Ninco, Carrera tracks. The ones with a “N” are usually 22-shore with a hybrid or full Urethane base, “N” = Ninco since the tires are made to dig into the gritty Ninco track surface. N22 tires are basically equal to NSR Ultragrips; leave lots of grey dust.
Slot.IT does not either (a) have an explicit documented reference of the compound Prefix meanings, it is derived from the recommended surfaces they match the tires to.
(b) consistency in including the Mold-number (e.g. the 11xx or 12xx etc.) or compound number on the tire.
For example, tires with a “P6” compound only have the Slot.IT name on the Sidewall, the only clue they are P6s is they are near the same size as a PT28(F30), they are rubber-based and almost as soft as F30s. There are 3 P6 tires, PT24, PT25, PT1207P6.
(c) Consistency across the years on part numbers.
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Sammy with Montrose