I'd be really interested to know what affect going from the gold spring to the purple spring has on your set up. I currently have the gold EPI spring with the Coop45 machined sheave installed as per Arnie's recommendation on the spring choice. I also have a purple EPI spring to try if I didn't like the gold spring but I have never installed it. So, I am curious what affect it has on low end responsiveness and also on the high end. My assumption is that since the gold spring is stiffer than the purple spring, it causes more back shifting and would assume that should also mean better low end responsiveness. But I know most people on this forum are using the purple spring rather than the gold. So please let us know what you think of the purple spring in comparison to the gold.I’d be interested to hear the results , mainly on the spring swap.
I have a coops sheave and as recommended by Arnie I have a gold spring fitted , running 27” htr’s.
I don’t know if that’s correct or whether I too would somehow benefit from a drop to a purple.
If I did , what would I actually feel difference wise please ?
The only issue I have is lack of availability in the UK, there is simply very little available for tuning of any description so would have to order the spring from the US.