Spring Technical Information

Spring Types

There are 3 different springs to be had when it comes to coilover suspension. They are, from left to right, Linear, S-Barrel, and V-Barrel.

Spring Differences

Linear Springs

The Linear Springs are the most common springs and cover a wide variety of different suspension setups. They are a standard 62mm inner diameter with lengths ranging from 120mm-260mm. When reading the numbers on your springs, they are in order from inner diameter, static spring length, and spring rate.

Linear Springs

62 - Refers to the inner diameter of the spring from end to end, given in mm

180 - Refers to the static spring length before being compressed, given in mm

010 (10k) - Refers to the spring rate, given in Kgf/mm

S-Barrel Springs

The S-Barrel Springs are used commonly in suspensions that use an independent rear suspension (IRS). They use the standard 62mm inner diameter on each end, but towards the middle of the spring, they are made to bow outwards. This allows for a shorter spring to be used since when the spring compresses, the coils will not touch and make noises. Due to the extra space, spring stroke is not compromised even though a shorter spring is used.

 

 

S-Barrel

62 - Refers to the Inner Diameter on each end, given in mm

180 - Refers to the static spring length before being compressed, given in mm

008 (8k) - Refers to the spring rate, given in Kgf/mm

V-Barrel Springs

On a large variety of newer cars, none of the above springs can be used for the rear of an independent rear suspension chassis. Manufacturers now use different sized mounting points for the OEM springs. For these applications, custom wound springs are classified as V-Barrel springs. Using these springs allows BC to make one end sized for the OEM mounting point, with the other end a perfect fitment for their height adjusters. Full height adjustability is maintained, however the options for shorter/stiffer springs become very limited, many times to only one option. Reading the information on these springs can be a little tricky since they have 4 numbers instead of 3.

 

V-Barrel

62 - Refers to the Inner Diameter of the smaller end of the spring, given in mm

97 - Refers to the Inner Diameter of the larger end of the spring where it mounts to the OEM spring bucket, given in mm

210 - Refers to the static length of the spring before it is compressed, given in mm

008 (8k) - Refers to the spring rate, given in Kgf/mm