The compound
Circo S88.
The step up from S83 for street and entry-level trackday use, with more friction and a 650°C ceiling. Still usable from ambient, so it suits a car that drives to the circuit.
Operating range0–650°C
Friction µ0.38–0.40
Pad lifeSame as above - rating bar only, no number published.
Cross-brand equivalents
Run something similar.
These are the compounds we stock for the AP Racing 6-pot RD54 (with tab) whose published friction and operating temperature come closest to Circo S88. They are a starting point for switching brands — not a guarantee of identical feel, because each manufacturer measures friction on their own equipment.
WinmaX WP2
Close0–600°Cµ 0.36–0.39
Built for 4WD towing and high-GVM work rather than circuit racing.
Matched on published friction and operating temperature.
From $362Project Mu H21
Partial match200–850°C
Circuit and endurance racing. Project Mu rate it as kind to the rotor with long pad life.
Matched on published operating temperature only — one of the two brands doesn’t publish a friction figure, so this is a weaker comparison.
Fits the same caliper
More pads for the AP Racing 6-pot RD54 (with tab).
Pairs well with
