Tech Area Spring Calculator | Spring Calculator |
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To be used as a guide to spring selection. The springrate's recommended give a sag of around 28 or 30%. For info on checking your sag
See note below for guidance on using this Spring Calculator...
How do I determine the stroke of my shock? You have a choice between 1.25 - 3.00 inches. To determine your shock's stroke consult your owner's manual or manufacturer's website. The rear shock specification will be something like 8.75 x 2.75" (222 x 71mm) where the 8.75 = the eye to eye & 2.75 = the stroke. If you can't find a figure you will have to remove the spring and measure it (25.4mm = 1 inch) NB. Fox confuse spring marking by quoting the maximum travel the spring will go to before it becomes coil-bound. eg 1.65 = 1.5 stroke, 2.35 or 2.38 = 2.0 or 2.25" stroke, 2.8 = 2.5 or 2.75" stroke & 3.25 = 3.00" stroke
How do I determine my Wheel Travel? Consult your owner's manual or manufacturer's website or get your tape measure out! What do the spring rate figures mean? The spring rate is the amount of force necessary in pounds to compress the spring one inch. When you order a spring you need to order the right spring rate together with the shock stroke eg 450 x 2.75 (where 450 is the springrate & 2.75 is the shock stroke) NB. Fox confuse spring marking by quoting the maximum amount the spring can be compressed before it becomes coil-bound.... 1.65 = 1.5 stroke, 2.35 = 2.0 or 2.25" stroke, 2.8 = 2.5 or 2.75" stroke & 3.25 = 3.00" stroke Why use 28 & 33% sag These are 'ball park' figures as recognised sag for XC = 20-30%, Trail/Freeride = 25-35% & DH 30-40%. You therefore have to alter the recommended spring figure according to your style of riding.
What is sag? see here
What if I'm doing drops? Generally you will need a 10-15% higher spring rate than recommended for 28% sag, if you're into hucking. This may mean you need 2 springs for your bike ... one for DH/Trail and one for Hucking How do I order a spring? To order any spring or get advice on your requirements call We do not carry many Fox DHX springs in stock as Manitou (black - £25) or 5th (silver/white - £20) will fit. If you want, we can order Fox springs (£54).
See notes below calculator on its use... |
