This might be an aluminum I-arm used for the front upper arm of this YD-2 series. Red anodized color to match the red version of the YD-2 series. By moving the spacer, the caster angle may be adjusted ahead and backward within a selection of 7mm, making it possible to raise the adjustment range and set the caster angle smaller compared to standard. Although made from very rigid aluminum, the I-arm shape makes it since light as you are able to. When changing from standard resin to this product, be sure to utilize the D-155 series upper we arm rod end adapter.
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