Rear Sprockets - Speed Or Power
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From: Airtech f9 (markj@airtechlondon.f9.co.uk) Subject: Rear Sprockets - Speed Or Power Newsgroups: alt.motorcycles.ducati Date: 2002-05-02 03:07:09 PST I am looking to buy a new rear sprocket for a Ducati 600SS, and have been informed that I need to decide whether to fit a standard one or drop/increase the amount of teeth. Can anyone advise as to what difference it will make if I increase or decrease the sprocket teeth. (any reccomendations!!) Also, if I have to replace both sprockets and chain in one go, as the shop tell me that it must all be done at once. Thanks Mark
From: Wolfgang Pawlinetz (wolfgang.pawlinetz@space.at) Date: 2002-05-02 10:33:19 PST If you decrease rear sprocket teeth number, your bike will go faster but accelerate less fast. If you increase the rear sprocket teeth number it's vice versa. You can achieve the same effect if you decrease the front sprocket teeth. That would make your bike accelerate faster and so on. Usually the changes on the front sprocket are in the order of one tooth up or down. If you want to gear your bike shorter, one tooth lower on the front sprocket normally suffices. However, I can't give you a recommendattion on the gearing on your 600. > Also, if I have to > replace both sprockets and chain in one go, as the shop tell me that > it must all be done at once. Yes. It's good practice to change the complete set of sprockets and chain. teeth are most likely worn out together with the chain.
From: ppointer@nospamindspring.com Date: 2002-05-02 20:07:39 PST We don't have the 600ss in the states. In general, most ss riders I know have added a minimum 2 teeth to the rear. A friend that has my old 900ss actually went four up in the rear. I've added two teeth to the rear sprocket of my 996. What I have found is that these bikes are easier to ride in the city with the motor revving up just slightly higher for any given speed over the stock gearing. Obviously, acceleration is improved. I've not seen any negative effects on gas mileage. Although not equivalent mathematically, you can go down one tooth in the front instead of up two teeth in the rear. The advantage is that you don't need a longer chain.
From: Moose (moose@hebe.karoo.co.uk) Date: 2002-05-07 13:48:34 PST Also bear in mind the effect on final drive.... More teeth = better acceration but ultimately - less top speed I fitted a replacement with 4 xtra = 2.5 mph top end loss per tooth as I had done the book 125mph but could never get past 115mph from then on. I have reverted too standard and will fit 'bore-kit' which give about 640cc (new heads/pistons/etc..) but better mid-range. Cheers Jake
From: Scott Gardner (gardners14@cox.net) Date: 2002-05-08 21:39:01 PST I have a Monster 900ie, and from the day I bought it, I thought that it was geared a little tall for around-town driving. I think the stock setup was 15-tooth front and 37-tooth rear. I replaced the front sprocket with a 14-tooth version, and the bike feels much "peppier" around town. You don't have to slip the clutch to get away smoothly, and overall acceleration has improved. Plus, since I did the swap right away, I didn't feel the need to replace the rear sprocket or chain. I'm not sure why the bike was geared so tall to begin with, but I think some of the noise/emissions tests which the bike must pass are performed at a certain *road speed*, not a particular *engine* speed, so it would help the manufacturer out to drop the RPM down as much as they could via choice of sprockets. Just a thought, I'm not positive about this. Scott