Polini 4.5 – 6 Gram Roller Tuning Kit 19 x 15.5mm. Weight options include: 4,5g + 5,0g + 5,5g + 6,0g

Scooter tuning can often be won or lost in the transmission. This clever kit allows you to exchange the weight component of the roller from the outer plastic shell, giving you a huge array of combinations for fine tuning of your transmission. the kit includes 6x each weight of 4.5, 5, 5.5 and 6 gram weight inserts – and remember, you can run combinations in between that of 3 x 3, giving you am incredible amount of tunability. The outer plastic shells can also be purchased separately when they wear out!