Originally Posted by
415tam
I was just wondering what what is the best spur and pinion to use on the BD7when running 17.5 blinky as I have read people were having slight problems when mounting certain brands of spur and pinion.
Many thanks.
A 96t spur gets you down to a FDR of 3.84 with a 50t pinion. If you want a lower FDR you will need a 92/93 spur. The problem is going to be your pinion size due to the clearance it has with the motor mount aluminium support piece. On the 96t spur I don't have room for anything bigger than a 50t pinion without the pinion grinding metal.