The H&R 29115-1 is a coil spring lowering kit for the second-generation Volvo C70 Cabrio, the P1-platform convertible. The manufacturer lists this M, Cabrio kit for 2006-13 model years, with approximate lowering of 1.3 inches up front and 1.25 inches in the rear. That drop tightens the wheel-arch gap and lowers the center of gravity, which is the main reason owners fit a set of sport springs before turning to coilovers. The premium over an unbranded set is justified by the model-specific part number. One owner on a user forum chose H&R because it offered a C70-specific part number, while some other brands grouped the C70 with the V50, S40 and C30, which carry different weight distribution.
Owners on user forums who ran H&R springs on a 2008 C70 with Bilstein B4 shocks describe nice, even fitment on 18-inch summer tires. Forum members also advise replacing the dampers alongside the springs, since upgraded shocks are recommended when a car is lowered. Searchers looking for "H&R 29115-1 C70 cabrio sport springs," "2006-2013 Volvo C70 M cabrio drop" or "C70 P1 lowering springs with Bilstein" are generally looking for this exact setup.
The manufacturer lists approximately 1.3 inches of lowering at the front and 1.25 inches at the rear. Actual ride height will depend on your current tires, wheels and suspension condition.
Owners on user forums commonly recommend upgrading the shocks at the same time as the springs, and one owner who ran H&R springs on a 2008 C70 paired them with Bilstein B4 shocks.
The manufacturer lists the 2006-2013 Volvo C70 M Cabrio. Submodel details vary across sources, so confirm your exact car with the manufacturer before ordering.
Owners on user forums describe this as a manageable driveway job for someone comfortable with suspension work, but they note that you need a spring compressor for the front strut springs, and the rear coils can require one as well. One owner broke the spring anchorage that keeps the spring in place, so inspect the seats and anchorages before reassembly. Because the rear springs may require removing the shock, inspect the shock's top mount and consider replacing it. Plan on a wheel alignment after the swap, and have the car on jack stands with a torque wrench ready for the strut and shock fasteners.
