The large wheel means you can have less movement between each gear selection, making gear selection much easier. This stops the clutch and arm being pulled into the air for 1st gear and wrapping your arm around in 4th.
Made in steel to gain weight in the headset and adds to all the other precision made heavy bushes and rods to help reduce the vibration in the headset area.
 It also stops slop from using the roll pins in plastic bushes.
 
These use 5mm roll pins as per the stronger Indian plastic rollers, if you have an Italian rod with a 4mm hole then it needs drilling to 5mm.
 
These now also come with 4 x 4mm allen screws so you can tighten the roller to splined type Li, Sx, Tv control rods and you dont then use the roll pin.
 
 
Part number: LUMRB0816