Replacing the front fork springs with the proper rate for your riding style and weight can make a trememdous difference in the performance of your forks. Replacing the springs if they are too firm or soft is one of the best bang for the buck suspension upgrades available.
A High Performance Spring has a high stiffness to mass ratio. In other words, it is light weight for a particular rate. This requires the finest materials.
And, of course, you want the specific rate you're paying for. Most manufacturers hold rates within +/-5%, this means a spring marked 5.0 kg/mm could be a 4.75 or even 5.25. (A spring marked 5.0 could be the same rate as one marked 5.4!) Race Tech Springs have extremely accurate rates.
Chrome silicon, high stiffness to mass ratio, shot peened, heat treated and pre-set (no sacking). These are the finest springs available, period!
Features:
- High performance spring
- Extremely accurate rates
- Chrome silicon, high stiffness-to-mass ratio, shot-peened, heat-treated and pre-set (no sacking)
- To convert KG/MM to LBS/IN. multiply KG/MM by 55.8
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Good quality springs. Instructions are poor.
The quality is excellent. The only issue I have with these is that they require you to calculate the installed preload and use spacers to make up the difference, as they are a bit shorter than factory springs. This is not an issue, and they provide spacer washers and a tube that you can cut to length. However! The instructions that come with the kit are vague and the ones that are referenced online are similarly vague. There is absolutely no reason for this. They could easily create a few standardized sets of instruction documents based on cartridge design, and then fill in the values dynamically for each application when they print them out or reference them online. This wouldn't even take much work. The most difficult part would be compiling the reference dimensions for each model. But presumably they've already done this, since they offer these for specific cartridges and models. This is just poor design process. Anyways, here's the info you need: Search for "Dave Moss installed preload". For my application ('09 R6), you can just stack the provided washers at the bottom to make the springs the same height as the stock ones. Cutting and using the provided spacer tube is unnecessary for this application. I polished the outside of the springs to reduce the friction and excessive noise that these shot peened tend to have. Everything works as expected and the quality is exceptional.
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