The real genuine rubber cone spring, made correctly from Rover's only original tooling for the assembly line and spare parts sales, despite others' claims.
These are the only product available with correct ride height, bonding to metal, threaded top cup and metal ring made in the UK.
Beware of all copies and old stock being offered anywhere for sale especially on Ebay and websites. Genuine cones are precisely manufactured to certain technical specifications with the patent number stamped in the rubber. Anything without "patent number 763432" is not genuine.
The compact design & durability/quality of the rubber cone helped make the Mini the classic that it is today. Designed in the late 1950's it was ahead of it's time. The only problem is that some may still be driving around on cones that could have been built in the early 1960's with a UNF thread. They are now only Metric thread. The design is good, not ever lasting. The rubber not only gets very hard but it also sags and loses it's ability to hold the car upright. It is not uncommon to have a cone sag so badly that it lowers the car 2 or 3 inches and it handles terribly. Like all rubber products, they only have a certain shelf life and being fitted equates to the same. These might need replacing every 5-7 years depending on use and climate, but are usually good for at least 20,000 miles in the UK.
Measured at the wheel, the spring rates at the static load position are 118 lb/in at the front and 98 lb/in at the rear. With three passengers and 50 lb of luggage, the loads per wheel at the same position are respectively 468 lb and 355 lb.
These loads rise to 1,050 lb and 670 lb at full bump and fall to 240 lb and 100 lb when the rebound check is in operation.
You will require a tool to replace this item which is TOOL07 for metric thread only or the dual threaded tool is 660330.
These cones springs used to retail for £60-00 when Rover had the tooling.