Fitment
Will this fit?
Fitment data still being indexed for this product. Ask BuildBot for a fit-check against your vehicle.
The compound
Circo S99.
Circo’s entry-level racing compound, also used in 2WD rally. It works from 100°C to 700°C — enough range for club racing without the cold-lap penalty of a full race compound.
Operating range100–700°C
Friction µ0.40–0.43
Pad lifeSame - no numeric figure published.
Cross-brand equivalents
Run something similar.
These are the compounds we stock for the Mazda RX8 front whose published friction and operating temperature come closest to Circo S99. They are a starting point for switching brands — not a guarantee of identical feel, because each manufacturer measures friction on their own equipment.
WinmaX W5
Very close100–750°Cµ 0.40–0.43
WinmaX’s standard circuit model, and the default club racing and rally choice in the range.
Matched on published friction and operating temperature.
From $321 · in stockProject Mu PCR09
Close300–800°Cµ 0.42–0.55
Project Mu’s Club Racer. A strong trackday pad, but with a 300°C floor it is the range’s worst choice for a cold first lap.
Fits the same caliper
More pads for the Mazda RX8 front.
Pairs well with
