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Todella joustavasta muovista tehty RPM tukivarsi parantaa auton kestävyyttä varsinkin kylmällä kelillä.
Tehty ARRMA Granite ja Senton autoon, sekä Big Rock 4x4 v1 ja v2 autoille (sinisellä korilla). Ei siis sovi Big Rock v3 (mustalla korilla), Big Rock v3 käyttää näitä tukivarsia:
The RPM Arrma 4x4 Rear Suspension Arm Set is compatible with 4×4 3S BLX versions of the Granite, Senton & Big Rock. These optional arms offer increased adjustability, improved durability and reduced weight. RPM added a second shock mount to both the front and rear A-arms to the outside of the stock shock mount, adding adjustability and improving trackability. This outer shock mount lowers the ride height, increasing stability on all surface types. A lower ride height also means faster corner speeds. Molded from RPM's trademark blend of indestructible, engineering grade nylons, you can’t get much tougher! RPM also redesigned the shape of the A-arms while retaining stock suspension geometry to help improve survivability for those “oops” moments. With RPM's stronger materials and improved designs, they are able to cut out unnecessary weight while still offering suspension components that are unparalleled in performance and durability.