SuperFlex advanced polyurethane suspension bushes

Guide to Hardness Selection

It has become necessary to dispel many myths & misconceptions on application of hardness caused by imitation.

SuperFlex grades are all pre determined in hardness suitable for road to fast road use. As a customer, you do not have to choose the hardness, unless there is an option on our listings.

On some cars many production hardness grades are applied in various positions around the car, depending on the load in that location – as tested and pre determined by us.

Colours of SuperFlex bushes do not identify hardness, with the exception of 95 shore which is primarily produced in red. Colour codes are still applied so some of our universal hotrod/kit car bushes

To simply blanket a car with one hardness and call it: comfort, dynamic, performance, race, road or touring displays compromise or limited production capability and doesn’t work.

See selection chart below - based on over 25 years PU marketing experience:

Guide to Hardness Selection

50, 60, 70 Shore - Typically subframe mountings, replacement of pu foam shock mounts etc. where low NVH is a priority and situations where compliance is desirable.

80, 88 Shore - Typically wishbone, radius rod, non coil over shock eye bushes

90 Shore - Typically leaf spring eyes or more heavily loaded wishbones & radius arms, trunnion bushes where replacing rubber

95 Shore - Typically intensely loaded coil over shock bushes, trunnion bushes where replacing nylon.

For certain applications we can make bushes typically in firmer grades to special order. The lead time for this service is 2 weeks..