Spring Calculator

Rider Weight (lbs):
Wheel Travel (inches):
Shock Stroke (inches):
Spring Rate (Lbs/In):


Rider Weight - 1kg = 2.2lbs, 1Stone = 14lbs

Wheel Travel - 1inch = 25.4mm

Shock stroke - 1inch = 25.4mm



How do I determine the stroke of my shock?

You can go about this in one of two ways:

Find out from Manufacturer – look in your user manual for your bike or go to the manufacturers website and find specifications for your bike. You will be given a size for the shock which will look something like this – 8.75” x 2.75”. The second part, or the smaller value, relates to the stroke length. They may give the dimensions in millimetres, to convert divide by 25.4 and you get the measurement in inches e.g. 76mm divided by 25.4 = 2.99”.

Measure you shock – to measure your shock take the distance from the main body of the shock to the end of the shaft, see pic below...



How do I determine my wheel travel?

The term “wheel travel” refers to the distance the rear wheel moves from the shock being fully extended, to being fully compressed. The easiest way to find this out is to look in your bikes’ user manual or the manufactures’ website. If you are unsure please contact us.


What's a spring rate? 

The spring rate is the amount of force required to compress the spring over a set distance. The most common value is ‘lbs per inch’ or ’lb/in’. So for example, a 300lb/in spring will need 300lbs of force to move it 1 inch.