Thanks for that RGregor, if I'm correct I would gain about 9kph @6000
I'm not smart enough to work out the rpm reduction @ 160 kph (currently app. 6,000 @ 160 kph)
My motor is stock although it has quite acceptable roll on in 5th, I think it would pull the taller gear ok.
My serious riding in the mountains relies on 2nd, 3rd and 4th so the taller gear will not interfere with my fun.
I think that knowing the rpm reduction provided by the taller gear will assist me greatly in understanding how suitable it will be.
Are there any negative aspects associated with installing the taller 5th besides insufficient engine power?
Lord of the Bings, kangaroo farmer