Prpgressivly wound fork spring = OEM?

[Franko!]

I took apart my CBR600 F2 track bike forks. The spring is progressive (bottom coils are much loser together) and this suprised me. Am I running on OEM springs? There is no marking on them anywhere.

 

[Brian P]

OEM springs are frequently either progressive or dual-rate (similar, but the change in pitch is abrupt, between one section that is tightly wound and another that is less so).

Regardless of OEM or "Progressive Suspension" my opinion is that you will be better off with a set of straight-rate springs that are correct for your weight.

 

[Franko!]

Thanks Brian. 0.9 Race Tech have been ordered.