[ST] Re: st-digest V2001 #711

[Nicolas Nowak <nnowak@xxxxxxxxxxxxxx>]

Rich,
First off, you should keep the stock chain length with any of the sprocket
combos listed in the FAQ http://www.triumphnet.com/st/faq/chain/index.html

Assuming approximately 5000rpm @ 80mph with stock 19/43 gearing, the
following sprocket combos will roughly change rpm as follows
19/45 +250
18/43 +300
18/45 +500
17/43 +600
17/45 +850

For any given speed, the formula is as follows...
(Original RPM X New Ratio)/Old Ratio = New RPM

17/45 will give you the fastest acceleration, but the lowest top end.
Adding teeth to the back is basially the same as subtracting teeth from the
front.  If you are looking for a happy medium, I would suggest 18/43.

Nick
'00 yellow RS

>Date: Sat, 24 Nov 2001 19:16:19 -0500
>From: "rmasiak" <rmasiak@xxxxxxxxxxx>
>Subject: Re: [ST] Intro etc and sprockets
>
>Nick,
>You mentioned: QUOTE: "Many people on the list have installed the 17 tooth
>sprocket and love it."
>
>Does that mean that all that was changed was the front sprocket?  The FAQ
>mentioned that a 17/43 gives better acceleration in 1st & 2nd, but leaves
>the top end looking for a shift at highway speeds.  I interpret that as
>meaning that in 6th gear doing 75-80mph, the RPM's are high enough that the
>bike wants another shift.
>
>I was thinking of not only dropping my front sprocket down to 17, but also
>bumping my rear up to 45.  Would using a 17/45 instead of a 17/43 help on
>the top end and still give better acceleration in 1st & 2nd? and if so what
>would the 17/45 combo do to chain length?
>
>Best regards,
>
>Rich
>'00 Lucifer Orange RS
>


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