Your arrow spine (deflection/stiffness) is affected by bow poundage, cut length, head weight, and shooting form.
A full overview of arrow testing recommendations can be found on our arrow testing page.
For the majority of shooters, the GrizzlyStik arrow spines fall into the following spine/bow poundage spectrums.
Momentum TDT 170 spine is for 70# - 90# bow draws
Momentum TDT 240 spine is for 60# - 80# bow draws
Momentum TDT 320 spine is for 50# - 70# bow draws
Momentum TDT 400 spine is for 40# - 60# bow draws
Click on the desired arrow spine above or the image below to enlarge the image
