Parts & Accessories › TIED HELIX 66-56 ER F 64-54 ER F S/M Image 1 of 1 TIED HELIX 66-56 ER F 64-54 ER F S/M $108.95 Twin Traxâ„¢ helix produce a quick up-shift and improve back-shift for excellent throttle responseThe dual-angle option helix offers fine-tuning for changing conditions Quantity: Purchase Added! Twin Traxâ„¢ helix produce a quick up-shift and improve back-shift for excellent throttle responseThe dual-angle option helix offers fine-tuning for changing conditions