brutale rear spocket - MVAgusta.net
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post #1 of 21 (permalink) Old 03-18-2007, 06:18 PM Thread Starter
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brutale rear spocket

anyone try lowering the rear spocket size to a 42 or 41 tooth (525 stock chain/43)..........of course lowering engine rpm at speed, etc., im looking for if the chain would rub the swing arm guides etc......problems found or not.
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post #2 of 21 (permalink) Old 03-18-2007, 06:49 PM
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You will have to install a yellow box in order to re-calibrate your speedometer and odometer.
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post #3 of 21 (permalink) Old 03-18-2007, 07:24 PM Thread Starter
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ah yes, didnt think of that one.....thats why this forum is great---cdamb, thank you sir
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post #4 of 21 (permalink) Old 03-18-2007, 07:28 PM
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Quote:
Originally Posted by cdamb
You will have to install a yellow box in order to re-calibrate your speedometer and odometer.
This will take higher math than I'm capable of but minus 1 or 2 rear rear teeth may make the speedometer more accurate. Mine stock indicates about 8% high according to my GPS, and dropping 1 tooth should change the indicated speed less than 3%, 2 teeth less than 6% bringing the indicated speeds closer to actual.

My head hurts

Tom
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post #5 of 21 (permalink) Old 03-18-2007, 08:26 PM Thread Starter
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t, your cal. are darn near right on- thats for the input...........
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post #6 of 21 (permalink) Old 03-18-2007, 08:43 PM
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TPadden you da man. After I rote the post I thought of one tooth at the front sprocket and then wondered how much would 1 or 2 teeth in the rear change the ratio? Good catch!
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post #7 of 21 (permalink) Old 03-18-2007, 09:05 PM Thread Starter
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from the racing days, a general rule was 1 frt (counter shaft) spocket tooth was equal to 2 rear (drive) spocket teeth.......thanks for all the input. mainly wondering about the swing arm/chain clearances; at suspension compression of course.
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post #8 of 21 (permalink) Old 03-19-2007, 11:20 AM
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Still no answer from anyone who has dropped teeth on the rear. Looks like you're the first - if you do keep us informed because I'm interested in the 41 rear.

Thanks,
Tom
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post #9 of 21 (permalink) Old 03-19-2007, 11:52 AM
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Not yet, but I'm seriously planning on dropping mine to a 41 (*2 down) this summer. At cruising speed on the freeway it revs 6-7rpm which is a little high for me. The motor has crazy torque so I don't think it will hurt city driving much.




Quote:
Originally Posted by FUBAR
anyone try lowering the rear spocket size to a 42 or 41 tooth (525 stock chain/43)..........of course lowering engine rpm at speed, etc., im looking for if the chain would rub the swing arm guides etc......problems found or not.

Bike History:
'88 Ninja 250 > '92 GSXR-600 > '01 YZF-R1 > '06 Brutale + '07 Customized VTX-1300
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post #10 of 21 (permalink) Old 03-19-2007, 01:13 PM
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the local dealer suggested I went up a tooth on the front for better cruising. I haven't done it yet but could be good.

John
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