14+ FZ-09 / XSR900 / FJ-09 Linear Rate Fork Spring Kit


Typically ships by next business day.

Spring Rate * 

Oil? * 


The FZ-09’s fork springs are designed for a rider weighing less than ~170 lbs (in gear).  If you weigh more and/or ride aggressively on the street or track, stiffer springs are in order.  Manufactured by Sonic Springs right here in the USA and available in a variety of rates.

These springs are stock replacement and do not require new spring spacers.  Price is per pair unless you order 0.80 kg/mm – you will receive one 0.85 kg/mm spring which is intended to be used in one fork leg with the stock spring in the other.  Trust us, it works!

Contact us for assistance in selecting a spring rate and oil weight.


Additional information

Weight 4.0 lbs
Dimensions 12 × 3 × 2 in


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