All SC tyres fit on all SC rims, so the Proline SC Tyres will fit stock HPI rims.
Regrading the inserts, SC wheels come in 2 flavors:
"Stepped", with smaller diameters on the outside - stock Slash and Blitz wheels.
"Flat", with a constant diameter (except for the small diameter on the outside tyre mounting bead) - stock Losi, associated and most aftermarket wheels.
The "flat" wheels require flat inserts and the "stepped" wheels require stepped or 2 piece inserts.
Proline SC Tyres used to include 2 piece inserts (a blue outer insert and a gray inner insert that fills the "step" in the wheel).
Recently made Proline SC Tyres include only blue outer inserts. In order to mount them on stepped wheels like the blitz's, the gray inner insert must be bought separately.
If you are buying the tyres in a local shop, check if they have the gray inner inserts. If you are ordering, you can't be sure which inserts you will get.
Avner.
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