Graves Motorsports Works Captive Front Wheel Spacer Kit. Built using R&D from the WORKS Graves Yamaha factory bikes, this spacer kit replaces your front or rear wheel's O.E.M. spacers with push-in interlocking wheel spacers that stay in place. Great for quick change wheels, endurance racing and smooth wheel changing in general. Precision CNC-machined from 7075-T6 billet aluminum and black anodized. Don't be fooled by cheap versions that crush onto your wheels. Sold as a kit. Things to consider when buying captive wheel spacers: Graves uses 7075 T6 billet aluminum and then finishes in black anodize. This, compared to 6061, costs 3x more if you use a Chinese-grade 7075 and 4x more if you use a USA-made 7075 (which is way better and we do use). General reading will get you at an average of 7075 being about 80% stronger then most 6061 choices.