I know nothing
620 standard gearing is
15/44 as Paul said for the 620 Sport (5-speed)
15/46 for the early 620 Monster (5-Speed)
15/48 for the later 620 Monster (6-speed)
few gearing calulators can be found here
http://www.ducatisportingclub.com/sh...ad.php?t=81301 Looks like I need to upload the 6-speed one
On my 5 Speed box last year I ran 14T front and choose between a 44, 45 or 46 rear
This year with a six speed box I often ran a 47T rear but had 46 and 48 on the spare carriers
And ran a 45T at Mallory so as to only use 1st to 5th after running 14/48 in practice and using 2nd to 6th but finding I was a bit busy hoiking gears as I came down the devils elbow