H&R's 29086-2 is a four-spring Sport set for the 2007-2013 Volvo C30, and the springs are produced at the H&R ISO 9001 certified engineering and manufacturing facility in Germany from special 54SiCr6 spring steel. Owners on user forums describe a drop of 1.3-1.4" front and back, and one long-term owner reports the ride is slightly firmer but not too harsh than stock. For a C30 that already sits low on its stock hardware, that combination of added stance and controlled ride is the main reason to choose this set over a generic drop spring.
Fit matters more on this car than on many others. One owner who tried S40 springs on a C30 found the front was fine and the rear was not, and switching to C30-specific springs resolved the problem. Front-end weight also affects which set you need: owners note that there is a firmer rated set for the D5/T5 as the front end is heavier than the little engines, so confirm the variant for your engine and front axle weight before ordering. Plan to replace the shocks at the same time, since forum advice is that lowering springs should be used with new shock absorbers. Searches for "C30 H&R 29086-2 lowering springs," "2007-2013 C30 sport springs 1.3 inch drop," and "C30 T5 lowering springs no rub" tend to lead to these same fitment questions.
Owners on user forums recommend fitting new shock absorbers with lowering springs, and note that aftermarket replacements won't be the same spring rate as stock anyway. The manufacturer's position on reusing factory shocks was not confirmed in research, so check with H&R before keeping the originals.
Yes. Owners on user forums say the firmer-rated set is used on the T5 and D5 because of the heavier front end, so match the spring to your engine and front axle load. Confirm the correct variant with the manufacturer before ordering.
Owners on user forums report that the ride is slightly firmer but not too harsh, and describe the looks as much improved.
Installation involves removing the factory springs and strut assemblies, so this is a job for someone comfortable with suspension work and proper spring-compression equipment. Owners on user forums warn that going too low can cause early C-V joint issues, so avoid stacking extra drop. Get a four-wheel alignment after the install, since forum users point out the need to correctly align the 4 wheels. Torque specs, exact tool list, and the manufacturer's install sheet were not confirmed in research, so pull the official instructions before starting.
