The correct shock length for Yamaha YFZ450 A-arms depends on the exact year, A-arm design, and whether the setup is standard travel, long travel, or a conversion. There is not one shock length that should be used for every YFZ450 A-arm package.
Start with the exact YFZ450 generation
YFZ450 fitment differs across model years, and YFZ450, YFZ450R, and YFZ450X components should not be treated as interchangeable just because the names are similar.
Then identify the A-arm design
If the A-arm is a standard-travel design, it may be intended to work with a stock-style shock length. If it is a long-travel design, the shock mount may be positioned for a longer eye-to-eye shock.
Where the 15.75-inch number applies
FullFlight Racing has Banshee A-arm configurations that specifically use 15.75-inch YFZ450 shocks. Those listings also state that the setup is not for YFZ450X or YFZ450R shocks. That 15.75-inch dimension is therefore a specific Banshee conversion requirement, not a universal recommendation for every YFZ450 A-arm setup.
How to choose correctly
Before ordering, confirm the exact ATV year/model, A-arm part, width, shock mount position, and required shock eye-to-eye length. If the current shock is known to be correct, measure it fully extended from the center of one mounting eye to the center of the other.
Best rule
Match the shock to the A-arm geometry, not simply to the ATV name or A-arm width.
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