2.5 Fox Internal Bypass Shocks Fox Internal Bypass Shocks are an innovative way of achieving multiple spring rates and damping rates all in one shock. The working components of a Fox Internal Bypass Shock are from 2" shocks and so are best on light weight vehicles, like the from of a sandrail. If you have very limited space to mount shocks on a play car this is an excellent option. The downsides of this shock versus an external bypass is that this shock required disassembly for adjustment and uses the more expensive 3" I.D. coil springs.
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