15-05-2019, 09:18 PM
Blue spring will suit most applications and it is unlikely that anything heavier then red will be required, also worth bearing in mind when playing with SU needles that the the basic set of profiles are the numbered ones, from there on all others are created for specific applications. The old rule of thumb for a fast road/race tuned seven on an 1 1/4" SU was blue spring and number 5 needle, this was very close to ideal in many cases. I appreciate this is somewhat academic regarding Mick's question and application, but may be of help to others reading.
Black Art Enthusiast