Fitment
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The compound
WinmaX W4.
A step up from W3 for sprint and entry-level motorsport, with a 50°C floor that keeps it usable on a cold first lap and a 700°C ceiling that survives a short race. It sits in the gap between the versatile road-and-track W3 and the full circuit W5.
Operating range50–700°C
Friction µ0.37–0.40
Cross-brand equivalents
Run something similar.
These are the compounds we stock for the AP CP5200 family / Brembo 4-pot B52 (D50) whose published friction and operating temperature come closest to WinmaX W4. They are a starting point for switching brands — not a guarantee of identical feel, because each manufacturer measures friction on their own equipment.
Circo S88
Very close0–650°Cµ 0.38–0.40
Street and entry-level trackday use — the step up from S83.
Matched on published friction and operating temperature.
From $381Circo M192
Very close100–750°Cµ 0.37–0.41
An endurance rear pad developed for GT3 and GT4 machinery.
Matched on published friction and operating temperature.
Fits the same caliper
More pads for the AP CP5200 family / Brembo 4-pot B52 (D50).
Pairs well with
