[Finnster]

So I tested the CRT.5 springs using the same method as above. I used the rear grey springs as well as the blues.

Grey: 59 gF/mm
Blue: 63 gF/mm

The blue HPI hellfire springs are almost the same rate as the stock grey springs on the CRT.5. The yellow OFNA 1/8th springs are quite a bit tighter, and the blue crt.5s are in the middle.

I would guess the silver HPI hellfire springs are ~74gF/mm by my method, heaiver than the .5 blues, but still less than the yellow LX1 springs.