I’ve spent a while looking at what all the little numbers on my spring actually mean. I think that I’ve got the basics of what they stand for etc…I’m currently using a 425×2.5 spring on my DH bike, having stuck my details into tftuned spring calculator it reckons that I should be using 385×2.5, so i guess that the closest would be a 375.

My question is, if I swap from 425 to 375 will I actually notice much difference?

Might get a bit better small bump compliance and possibly some bottoming out.