Recommended Gearing

[Shazaam!]

Questions come up regularly about recommended sprocket changes and the required chain lengths for superbikes. Here's my recommendations for general street and track use.

http://www.ducatisportingclub.com/images/dsc/shazaam/Recommended.jpg

There's a "sweet spot" - around 4,600 RPM @120Km/hr in 6th gear for liter displacement superbikes, a little higher for 74X's. Obviously, faster tracks will require rear sprockets with fewer teeth, slower tracks more teeth (and possibly longer chains.)
I strongly recommended NOT changing the stock front sprocket or chain size for safety reasons. Just my opinion.

[madmav]

Brilliant, thanks !.mav

[electricsheep]

Stunning :D:D:D:D

[Twinfan]

Cheers! Shame I need a new chain for my 749S to try it though :(

[skidlids]

http://www.bikerenews.com/Stories_Archives/GearRpmSpeedCalculator.htm

http://www.cosportbikeclub.org/misc/SpeedCalc.html

Maybe time to play with a few figures

[Harv748]

Another item to place in the technical archive;):(

[deej]

jeez

can someone please explain what all that means ???

what are the suggestions for a 748 and what would be then end result

cheers

deej

[ils]

Great stuff (once again) Shazaam!
I changed the gearing on my 996S to 14/40 and was amazed at the way it makes town riding so much better, but I was wondering why you think it's dangerous to change the front sprocket size?

[Mr_S]

Originally posted by deej
what are the suggestions for a 748 and what would be then end result

cheers

deej

3rd line down on the chart (14/40). It'll improve acceleration / drive for one thing.

[ducv2]

Originally posted by ils
Great stuff (once again) Shazaam!
I changed the gearing on my 996S to 14/40 and was amazed at the way it makes town riding so much better, but I was wondering why you think it's dangerous to change the front sprocket size?

I was told that due to the torque of the bigger engine, and the increased chain size, the chain did not appreciate running round a smaller radius sprocket, and that it was better (allthough more expensive) to go for a larger rear sprocket. I'm running 15/40.

[Shazaam!]

Originally posted by ils
I was wondering why you think it's dangerous to change the front sprocket size?

See Tales of the Front Sprocket here:

http://ducatisportingclub.com/xmb/viewthread.php?tid=9386#pid78060