StromTrooper banner
1 - 16 of 16 Posts

·
Registered
Joined
·
79 Posts
Discussion Starter · #1 ·
I'm at 83mph at exactly 6000 rpms, just wondering what everybody else is at. My 2008 650 has about 49,000 miles on it. Just curious.
 

·
Registered
Joined
·
96 Posts
Uphill/downhill? Into the wind or with it? Hot or cold? Fat or skinny? Orange or white?
 

·
Registered
Joined
·
3,906 Posts
I'm at 83mph at exactly 6000 rpms, just wondering what everybody else is at. My 2008 650 has about 49,000 miles on it. Just curious.
With stock sprockets (15/47), my speedometer says 81 mph at 6000 rpm.
My real speed is 74 mph.

With 14/47 sprockets, it says 76 mph at 6000 rpm.
Real speed 69.

- dunlop D607 on the front.
 

·
Registered
Joined
·
167 Posts
I have the 16-tooth front sprocket and for what its worth I'm turning 5500 at an indicated 80 (maybe 73-75??). That's pretty much what I run on the interstates around here.

Dave
 

·
Living the Stereotype
Joined
·
11,544 Posts
Which gear?
 

·
Registered
Joined
·
90 Posts
I always figured it to be about 75mph.
My rational: that is what I run on my commute. The speed limit is 70mph. Most of the traffic will do close to 75 in a 70 around here. My speedo reads about 82 at 6K rpms. The traffic is some passing me and some slower than me, an equal balance, so it should be just about 75mph.
As you can see it don't have an exact science the way I do it.
 

·
Registered
Joined
·
808 Posts
Spent a loooot of time comparing speed vs RPM on my recent trip when there wasn't much else to do!

6krpm on my stock Wee is almost dead on 120kph, ~74.5mph.

Edit: GPS, that is. I barely even know where the stock speedo is located. I think sometimes my radio blocks it. I don't look down there.
 

·
Registered
Joined
·
287 Posts
6,000 RPM is about 70mph actual, and ~75 indicated. I have a 14t sprocket on the front.

On my Denver to Detroit trip when I put the stock 15t back on it was about 75 actual and ~80-81 indicated at 6k RPM.
 

·
Registered
Joined
·
167 Posts
Looks to me like changing the front sprocket makes about a 500 rpm difference up or down.

At 6000 RPM...
14-tooth = ~70 MPH
15-tooth (stock) = ~75 MPH
16-tooth = ~ 80 MPH (although I usually ride at 5500 for an indicated 80 MPH)

Now I have to wonder how much difference these changes make in the MPG we get. As far as I can tell, I get about the same mileage with my 16-tooth as folks get with the stock 15-tooth sprocket (50-55 MPG in a mix of riding).

Dave
 

·
Registered
Joined
·
1,852 Posts
Speedo indicates 86MPH with a 15/45 sprocket combo, which equals a 3.0 final ratio...same as stock.
 
1 - 16 of 16 Posts
Top