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BC Racing coilover suspension - R56 MINI Cooper S (07-13) - BR Series

BC Racing coilover suspension - R56 MINI Cooper S (07-13) - BR Series

Imperial Performance

£1139

The BR series coilovers use a large 46mm diameter piston in a 53mm diameter damper body to maximise oil capacity. As the damper unit opearates the oil contained within heats up. The viscosity of oil changes as its temperature varies which can lead to changes in the damping characteristics of the unit. BC Racing only use a very high quality oil with their coilovers but go that extra mile to maximise performance and build their BR range with a large 53mm diameter damper body. This increases the capacity of the unit which increases the volume of oil contained which in turn reduces the peak temper

Imperial Performance's own words, read from their page.

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The part other shops don't tell you. Three separate questions, kept separate on purpose, each with its source.