501X Worlds Gearing

[DaveG28]

Hi all,

On the worlds or big belt 501x (91 spur, 37 pulleys) what gearing have people used for nosram/lrp 5.5 and 6.5?

I've used 15 pinion on 5.5 and 17 on 6.5, but this looks way too low when looking at the gearing chart, what have others used??