[Author Index] [Date Index] [Thread Index]
[Date Prev][Date Next][Thread Prev][Thread Next]

RE: [ST] Sprockets and Chain Maintenance



  I changed to a 17t sprocket on my '00 ST last summer and haven't
looked back since.  I have taken a couple 1200 mile roundtrips in that
time and can still get HIGH 40's(48 or 49) for my MPG when running 75-80
constantly between tanks.  The hightest I got once was 52MPG on a run to
MI once.  Just running around town or to and from work I reguarly get
46MPG, so it's still around 200 miles before a fill up, YMMV.  
  As for the *GRIN* factor there is no comparison between then and now,
even with 17000 miles since the change.  I looked into both the 17t and
18t for mine, and decided that a total of ~500rpm difference between 19
and 17 was small enough that I wouldn't worry about anything else.
To each his/her own though it comes down to you in the end.

Brad "Deviled Dawg" Applegate 
'00 Blue ST
TSRA# 227

"Horsepower is the measure of how hard you hit the wall, Torque is how
far you carry it afterwards"

- -----Original Message-----
From: owner-st@xxxxxxxxxx [mailto:owner-st@xxxxxxxxxx] On Behalf Of Brad
Turner
Sent: Friday, October 18, 2002 11:18 AM
To: 'colt4530@xxxxxxxxxxx '; 'RS@xxxxxxxxxxxxxx '
Subject: RE: [ST] Sprockets and Chain Maintenance


John,

Here's the quick math

43/19=2.26
43/17=2.53

2.53-2.26=.27

The way I figure it is a little under a 10% change (.27 delta from the
2.26 ratio baseline) so do you want that much change? It seems like a
pretty healthy bump to me. You also need to consider what it will do to
your cruising speed RPM (your RPMs will raise by the same %). To put it
into perspective you'd need to go up 5 teeth on the rear to a 48/19 to
achieve the same ratio change by altering the rear sprocket. This is not
exactly a subtle change. I've never played with the ST's gearing but I
have done it with other bikes but never this much.
....
later,
- -brad-



     *   *   *   *   *   *   *   *   *   *   *   *   *   *   *   *   *   *   *
      The ST/RS Mailing list is sponsored by Jack Lilley Ltd.
          http://www.TriumphNet.com/st/lilley for more info
   http://www.TriumphNet.com/st for ST, RS and Mailing List info

=-=-=-= Next Message =-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=