R COMPOUND

A Proven Winner

Shift Motorsport 'R' (formerly Kinetic 'R') compound is the lowest hysteresis Elastomer bump rubber available. Developed over the last 10 years to become the most durable and highest performing Elastomer bump rubber on the market.

Widely used in IndyCar, IndyLights, Formula 2, Formula 3, LMP2, GT and Formula E

Features:

Ultra low hysteresis, extremely stable stiffness vs temperature, highly durable

Available in 50,60,70 and 80 Shore stiffness variants

TOTAL CONTROL

All our Bump Rubbers meet the highest standards for repeatability and durability. Our products have successfully completed numerous LeMans 24hr races

We regularly produce CUSTOM bump rubbers at reasonable prices and short lead times, contact us for a quote

Every Shift Motorsport Bump Rubber is individually tested before shipping. In addition, when a client makes a repeat order we will test the new batch and compare to any previously supplied batches to ensure you are receiving the best possible match in performance time after time.

See BELOW our current stocked range, click View full details in each description for detailed sizing and some stiffness information or alternatively click the link below to download detailed stiffness information (Microsoft Excel format)

DOWNLOAD STIFFNESS FILE HERE

STOCKED PRODUCT LIST

CONTACT OUR TEAM ABOUT CUSTOM SIZES

STACKING EXAMPLES

  • 2 x K2 7mm in series is the stiffest 'combination' setup that we use

  • 7mm and 15mm height is a step softer than a single 15mm BR (of the same compound) but ramps up faster than the 2 x 15mm

  • 2 x 15mm in series still progressive but with a less aggressive profile*

    * using 2 x K8's in series will give an almost linear stiffness profile ranging from 300 to 800 lb/in - ideal if you would like to use a die spring but regulations do not allow !

K3 'IN-CUP' DESIGN

  • K3 bump rubbers are designed to go into a nylon (or aluminium) cup. The BR compresses until the cup closes and the secondary BR takes over. This gives a very low initial stiffness that can ramp-up as desired

  • K3 in nylon cup stacked with a K2 gives a very extreme increase in stiffness with a very smooth transition. Ultra reliable due to the stability given when the cup closes

  • For a slightly lower overall stiffness and less aggressive profile a 15mm BR can also be used in series with a K3