Posted by =?ISO-8859-1?Q?=22Blattus_Slaf on February 22, 2008, 6:24 pm
My sprocket ratio was 14 teeth on the drive and 50 teeth on the back
wheel or 3.51. I want a higher ratio so I went to still 14 on the drive
but 45 teeth on the back wheel. that makes it 3.21.
So if my little sprocket was going 2000rpm's the back one was going 560
rpm's and now it's going 623 rpm's. Should get better fuel mileage
now. Not against the law is it?
Blattus Slafaly ? 3 :) 7/8
Posted by Ken Abrams on February 22, 2008, 11:25 pm
>> Changing the rear sprocket is more difficult and expensive that doing the
>> front.....one tooth.
> Depends on the bike. Some require removal of the clutch to replace the
> sprocket.
RIGHT ! Thanks for that bit of wisdom.
And for "normal" street bikes, what percentage do you think are built that
way?? 5% ?? Less ??
Posted by Project Magnet #1 on February 23, 2008, 1:19 am
Ken Abrams wrote:
>
>
>>> Changing the rear sprocket is more difficult and expensive that doing
>>> the front.....one tooth.
>>
>> Depends on the bike. Some require removal of the clutch to replace the
>> sprocket.
>>
>
> RIGHT ! Thanks for that bit of wisdom.
> And for "normal" street bikes, what percentage do you think are built
> that way?? 5% ?? Less ??
Enough that I own several that require it.
Posted by Ken Abrams on February 23, 2008, 10:54 am
>>> Depends on the bike. Some require removal of the clutch to replace the
>>> sprocket.
>>>
>>
>> RIGHT ! Thanks for that bit of wisdom.
>> And for "normal" street bikes, what percentage do you think are built
>> that way?? 5% ?? Less ??
> Enough that I own several that require it.
OK, you started it, now how about finishing it?
Just exactly what make and model are those "several"?
And why is it that the CLUTCH must be removed to change the front drive
sprocket?
Posted by Mike Corey on February 23, 2008, 7:41 pm
I just read all the replies in this thread, and my head hurts. Why is
that?
One guy somehow switched the topic to removing the clutch assembly and
changing gears in the transmission? How did that happen?
To the original poster....
You went from a 50T rear sprocket to a 45T. Three things will happen
that you will notice right away. Your cruising RPM will be lower. Let's
say that at 60 MPH your bike ran at 6000 RPM, with the first gearing.
After the change, at 60 MPH your engine RPM will be 5500. These numbers
may not even be close, but you get the idea, right?
The second thing you will notice right away is slower acceleration.
The third will be a higher top speed.
I commute 35 miles one way to work on a Suzuki DR200. Not much of a
street bike, not even much of a trail bike, but it's what I've got and
I'm using it. It came with a 14T front and 45T rear. When I cruised down
the road listening to the engine, a comfortable cruising speed was only
50 MPH. At 60 MPH the engine was working way too hard for my taste. So I
installed a 39T rear sprocket. Now it cruises nicely at 60 MPH. And can
even make 70 when needed. Top speed is actually unknown. The speedometer
only goes up to 85, but it would not do that with the original gearing.
So for street use, you did the right thing. For serious dirt and / or
trail riding, you may have made a mistake. I still ride my DR200 on
trails, I just use a lower gear in the transmission then I did before.
"War is an ugly thing, but not the ugliest of things; the decayed and
degraded state of moral and patriotic feeling which thinks nothing is
worth a war, is worse." --- John Stuart Mill:
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>> front.....one tooth.
> Depends on the bike. Some require removal of the clutch to replace the
> sprocket.