A method of determining club parameters for at least one golf club, belonging to a set of golf clubs for a specific golfer, having arbitrary club length L k,n, each golf club (14; 20) having a shaft with an upper end and a lower end, a grip section on the upper end of the shaft, and a head (23; 30; 40) with a ball-striking surface mounted on the lower end of the shaft, each golf club having: a balance point BP wherein a balance point length L BP,n is defined from the distal end of the grip section to said balance point BP; a club weight m k,n; and a club head weight m kn,n with a centre of gravity CG arranged in a CG plane perpendicular to a first direction along the centre of the shaft, said club length L k,n is defined as a first distance from the distal end of the grip section to said plane along the first direction, the method comprising: A) selecting club length L ref,l of a first reference golf club, B) varying at least one club parameter belong to the group: club weight, club head weight, CG position and weight distribution of the first reference golf club to identify an interval for each varied club parameter of the first reference golf club for the golfer, characterized in that the method comprises: C) selecting a club parameter within each identified interval, whereby said golfer is able to reproducible hit a ball with a limited spread in at least one parameter belonging to the group: launch angle, spin, carry distance, swing tempo, spread angle, ball impact position on ball striking surface, ball speed at impact, and club speed at impact, D) selecting club length L ref,II of a second reference golf club being different than the club length L ref,I of the first reference golf club, E) repeating B and C for said second reference golf club, and F) calculating at least one torsional moment (PCF, ICF, HCF, GCF) based on said selected at least one club parameter for said first reference golf club and said second reference golf club, G) determining a relationship of each torsional moment (PCF, ICF, HCF, GCF) as a function of club length based on each corresponding calculated torsional moment in F, H) selecting club length L k, 1 for a first golf club belonging to the set of golf clubs and determining club parameters for the first golf club based on each determined relationship in G. A) selecting club length L ref,l of a first reference golf club, B) varying at least one club parameter belong to the group: club weight, club head weight, CG position and weight distribution of the first reference golf club to identify an interval for each varied club parameter of the first reference golf club for the golfer, characterized in that the method comprises: C) selecting a club parameter within each identified interval, whereby said golfer is able to reproducible hit a ball with a limited spread in at least one parameter belonging to the group: launch angle, spin, carry distance, swing tempo, spread angle, ball impact position on ball striking surface, ball speed at impact, and club speed at impact, D) selecting club length L ref,II of a second reference golf club being different than the club length L ref,I of the first reference golf club, E) repeating B and C for said second reference golf club, and F) calculating at least one torsional moment (PCF, ICF, HCF, GCF) based on said selected at least one club parameter for said first reference golf club and said second reference golf club, G) determining a relationship of each torsional moment (PCF, ICF, HCF, GCF) as a function of club length based on each corresponding calculated torsional moment in F, H) selecting club length L k, 1 for a first golf club belonging to the set of golf clubs and determining club parameters for the first golf club based on each determined relationship in G.