MC18 springs were all blue, and MC21 HRC springs were all black I seem to recall, but not sure about MC28 springs.
You would've thought they would have had a dab of paint on them to signify the rate, but they don't... at least the ones I have don't anyway.
Maybe ask Matt if he can have it checked for you, are see if YSS Thailand in BKK will test it? They have a shock dyno.
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Andy.
NSR-WORLD.COM
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