The Yokomo RP-089RA Racing Performer Ultra rear spring is made to work on loose dirt circuits where grip is limited. This red spring helps the rear end settle and regain traction on low-traction surfaces, making it a solid choice when you need predictable handling on dirt. It is compatible with the B-YZ4SF and a range of B-YZ2 chassis, so you can drop it into common Yokomo rear setups without major modification.
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