Weight: Approx 650g with a 32t chainring

310g (15mm)

5mm drive side spacer

Small - 31mm

it's likely coming from the tiny gaps around under your seat clamp

Fox Shox Steel Rear Shock Spring - 500lbs - 2.8 Inch Stroke PLP|Model Year Weight: Approx 650g with aCorrect spring rate is crucial for shock setup! These genuine Fox springs ensure you have accurate spring rates. Available in differ rates and strokes to fit your ride. Compatible with Fox DHX and VAN shocks. Please note: Stroke is dependent on your current shock and rate is based on your rider weight. To determine the correct spring rate please visit the Fox spring rate calculator page at the link below.