|
For the same outer diameter, the hollow bar will be slightly less stiff than the solid bar. Use the equation J=pi/32(D^4-d^4) to calculate the polar area moment of intertia for a hollow bar (vs J=pi*D^4/32 for a solid bar) and then the theta = Tl/JG equation to determine relative "spring rates".
The short answer is that - depending on your definition of stiff - I don't think 28mm bars (hollow or not) will be "too stiff" for street driving.
Mike
__________________
Mike
1976 Euro 911
3.2 w/10.3 compression & SSIs
22/29 torsions, 22/22 adjustable sways, Carrera brakes
|