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klr sprocket gear ratios
Posted: Tue Jun 22, 2010 12:07 pm
by Jeff Khoury
Good Morning,
Last weekend, I decided to pop on a 16T sprocket for my around town/highway riding. There are a lot of heated opinions on what countershaft sprocket to run and conflicting yet passionate opinions on how much of a difference these changes make in each gear. Being the obsessive person that I am, I decided to do a little math, or rather - let Excel do it for me.
Here is a nice chart so you can see the effect that changing to a particular countershaft sprocket will have on the resulting gear ratios. What surprised me most was the huge gap in ratio between first and second gears, but after making the chart and paying attention as I rode to work, I can see it in practice.
I'm attaching the spreadsheet in the spirit of "showing my work", so you all can play around with the data. Also included are speeds in MPH @ 5,000 RPM in each gear for each sprocket so you can see exactly what the resulting difference ends up being.
The tire circumference used in the calculations is for a brand new Kenda K761 and the source of the diameter of the tire came from their website. The gear ratios and primary reduction ratio came from the KLR spec sheet.
Feel free to critique my methodology if you think I got it wrong...
[img]cid:DWT141[/img]
-Jeff Khoury
klr sprocket gear ratios
Posted: Tue Jun 22, 2010 12:35 pm
by Jeff Khoury
Attachments :#ygrps-yiv-1503592993 p {margin:0;}I've added a chart that graphs linear velocity in each gear as well. What can I say, it must be OCD...
Also note that these speeds should be ACTUAL speeds, not INDICATED. We all know about the KLR's speedo error.
[img]cid:DWT141[/img]
-Jeff Khoury
----- Original Message -----
From: "Jeff Khoury" jeff@astatic.net>
To: "DSN KLR650" DSN_KLR650@yahoogroups.com>
Sent: Tuesday, June 22, 2010 10:06:57 AM GMT -08:00 US/Canada Pacific
Subject: [DSN_KLR650] KLR Sprocket Gear Ratios
#ygrps-yiv-1503592993 p {margin:0;}Good Morning,
Last weekend, I decided to pop on a 16T sprocket for my around town/highway riding. There are a lot of heated opinions on what countershaft sprocket to run and conflicting yet passionate opinions on how much of a difference these changes make in each gear. Being the obsessive person that I am, I decided to do a little math, or rather - let Excel do it for me.
Here is a nice chart so you can see the effect that changing to a particular countershaft sprocket will have on the resulting gear ratios. What surprised me most was the huge gap in ratio between first and second gears, but after making the chart and paying attention as I rode to work, I can see it in practice.
I'm attaching the spreadsheet in the spirit of "showing my work", so you all can play around with the data. Also included are speeds in MPH @ 5,000 RPM in each gear for each sprocket so you can see exactly what the resulting difference ends up being.
The tire circumference used in the calculations is for a brand new Kenda K761 and the source of the diameter of the tire came from their website. The gear ratios and primary reduction ratio came from the KLR spec sheet.
Feel free to critique my methodology if you think I got it wrong...
[img]cid:DWT141[/img]
-Jeff Khoury
klr sprocket gear ratios
Posted: Tue Jun 22, 2010 1:10 pm
by Thomas Landmann
Attachments :Hi Jeff... Since we've got the OCD thing out in the open [img]cid:
360@goomoji.gmail[/img] can we take this a little further?
I'm interested in the actual overlap between gears, so the bars could start at an arbitrary linear velocity which would be a reasonable minimum comfortable RPM in that gear... 1800 RPM or something? What do you think?
Tom
On Tue, Jun 22, 2010 at 12:35 PM, Jeff Khoury jeff@astatic.net> wrote:
I've added a chart that graphs linear velocity in each gear as well. What can I say, it must be OCD...
Also note that these speeds should be ACTUAL speeds, not INDICATED. We all know about the KLR's speedo error.
[img]cid:DWT141[/img]
-Jeff Khoury
----- Original Message -----
From: "Jeff Khoury" jeff@astatic.net>
To: "DSN KLR650" DSN_KLR650@yahoogroups.com>
Sent: Tuesday, June 22, 2010 10:06:57 AM GMT -08:00 US/Canada Pacific
Subject: [DSN_KLR650] KLR Sprocket Gear Ratios
Good Morning,
Last weekend, I decided to pop on a 16T sprocket for my around town/highway riding. There are a lot of heated opinions on what countershaft sprocket to run and conflicting yet passionate opinions on how much of a difference these changes make in each gear. Being the obsessive person that I am, I decided to do a little math, or rather - let Excel do it for me.
Here is a nice chart so you can see the effect that changing to a particular countershaft sprocket will have on the resulting gear ratios. What surprised me most was the huge gap in ratio between first and second gears, but after making the chart and paying attention as I rode to work, I can see it in practice.
I'm attaching the spreadsheet in the spirit of "showing my work", so you all can play around with the data. Also included are speeds in MPH @ 5,000 RPM in each gear for each sprocket so you can see exactly what the resulting difference ends up being.
The tire circumference used in the calculations is for a brand new Kenda K761 and the source of the diameter of the tire came from their website. The gear ratios and primary reduction ratio came from the KLR spec sheet.
Feel free to critique my methodology if you think I got it wrong...
[img]cid:DWT141[/img]
-Jeff Khoury
--
Democracy is two wolves and a lamb voting on what to have for lunch. Liberty is a well-armed lamb contesting the vote.
klr sprocket gear ratios
Posted: Tue Jun 22, 2010 1:57 pm
by Craig Kahler
Jeff, If its not too much trouble, add a 13t sprocket to the chart would be nice.
--- On [b]Tue, 6/22/10, Jeff Khoury [i]jeff@astatic.net>[/i][/b] wrote:
From: Jeff Khoury jeff@astatic.net>
Subject: Re: [DSN_KLR650] KLR Sprocket Gear Ratios
To: "DSN KLR650" DSN_KLR650@yahoogroups.com>
Cc: "DSN KLR650" DSN_KLR650@yahoogroups.com>
Date: Tuesday, June 22, 2010, 1:35 PM
#ygrps-yiv-1696753773 #ygrps-yiv-1696753773yiv813491577 p {margin:0;} I've added a chart that graphs linear velocity in each gear as well. What can I say, it must be OCD...
Also note that these speeds should be ACTUAL speeds, not INDICATED. We all know about the KLR's speedo error.
[img]cid:
1.277072203@web63005.mail.re1.yahoo.com[/img]
-Jeff Khoury
----- Original Message -----
From: "Jeff Khoury" jeff@astatic.net>
To: "DSN KLR650" DSN_KLR650@yahoogroups.com>
Sent: Tuesday, June 22, 2010 10:06:57 AM GMT -08:00 US/Canada Pacific
Subject: [DSN_KLR650] KLR Sprocket Gear Ratios
#ygrps-yiv-1696753773 #ygrps-yiv-1696753773yiv813491577 p {margin:0;} Good Morning,
Last weekend, I decided to pop on a 16T sprocket for my around town/highway riding. There are a lot of heated opinions on what countershaft sprocket to run and conflicting yet passionate opinions on how much of a difference these changes make in each gear. Being the obsessive person that I am, I decided to do a little math, or rather - let Excel do it for me.
Here is a nice chart so you can see the effect that changing to a particular countershaft sprocket will have on the resulting gear ratios. What surprised me most was the huge gap in ratio between first and second gears, but after making the chart and paying attention as I rode to work, I can see it in practice.
I'm attaching the spreadsheet in the spirit of "showing my work", so you all can play around with the data. Also included are speeds in MPH @ 5,000 RPM in each gear for each sprocket so you can see exactly what the resulting difference ends up being.
The tire circumference used in the calculations is for a brand new Kenda K761 and the source of the diameter of the tire came from their website. The gear ratios and primary reduction ratio came from the KLR spec sheet.
Feel free to critique my methodology if you think I got it wrong...
[img]cid:
1.277072203@web63005.mail.re1.yahoo.com[/img]
-Jeff Khoury
klr and 'rotella'
Posted: Tue Jun 22, 2010 2:12 pm
by The Reverend
The Wing-dingers are notoriously cheap.
Rotella seems to last as long in the KLR as GoldenSpectro (synthetic blend
MC oil), but for a FRACTION of the cost. I think the Rotella in a gallon can
is the same price as a quart of the Golden Spectro.
And the thing is the shifting gets "sloppier" somehow when the oil is due
for a change. At about the same intervals regardless of oil. Odd.
-----Original Message-----
From:
DSN_KLR650@yahoogroups.com [mailto:
DSN_KLR650@yahoogroups.com] On
Behalf Of revmaaatin
In reading the 2008 discussion on Rottella-T, Delvac received high
recomendations from some WING riders. They really must be cheap--as one guy
was constantly going 7K on an oil change.
klr sprocket gear ratios
Posted: Tue Jun 22, 2010 4:42 pm
by Jeff Khoury
Attachments :#ygrps-yiv-118578839 p {margin:0;}All,
Here are some charts updated to include 13T sprockets. The thing I find interesting (and it makes perfect sense) is that the sprocket change makes much less of a difference down low. The largest change (percent-wise) happens in the upper RPM range. See the trend chart and look at the angle plots. I added the slopes for first and fifth at the top of the chart in blue so you could see the difference.
I'm also looking for a place to post the .xls file so you can all play around with it. I'll let you know when I find a place.
[img]cid:DWT146[/img]
[img]cid:DWT147[/img]
[img]cid:DWT148[/img]
-Jeff Khoury
----- Original Message -----
From: "Craig Kahler" ckahleer@yahoo.com>
To: "dsn klr650" dsn_klr650@yahoogroups.com>
Sent: Tuesday, June 22, 2010 11:57:22 AM GMT -08:00 US/Canada Pacific
Subject: Re: [DSN_KLR650] KLR Sprocket Gear Ratios
Jeff, If its not too much trouble, add a 13t sprocket to the chart would be nice.
--- On [b]Tue, 6/22/10, Jeff Khoury [i]jeff@astatic.net>[/i][/b] wrote:
From: Jeff Khoury jeff@astatic.net>
Subject: Re: [DSN_KLR650] KLR Sprocket Gear Ratios
To: "DSN KLR650" DSN_KLR650@yahoogroups.com>
Cc: "DSN KLR650" DSN_KLR650@yahoogroups.com>
Date: Tuesday, June 22, 2010, 1:35 PM
#ygrps-yiv-118578839 #ygrps-yiv-118578839yiv813491577 p {margin:0;} I've added a chart that graphs linear velocity in each gear as well. What can I say, it must be OCD...
Also note that these speeds should be ACTUAL speeds, not INDICATED. We all know about the KLR's speedo error.
[img]cid:
1.277072203@web63005.mail.re1.yahoo.com[/img]
-Jeff Khoury
----- Original Message -----
From: "Jeff Khoury" jeff@astatic.net>
To: "DSN KLR650" DSN_KLR650@yahoogroups.com>
Sent: Tuesday, June 22, 2010 10:06:57 AM GMT -08:00 US/Canada Pacific
Subject: [DSN_KLR650] KLR Sprocket Gear Ratios
#ygrps-yiv-118578839 #ygrps-yiv-118578839yiv813491577 p {margin:0;} Good Morning,
Last weekend, I decided to pop on a 16T sprocket for my around town/highway riding. There are a lot of heated opinions on what countershaft sprocket to run and conflicting yet passionate opinions on how much of a difference these changes make in each gear. Being the obsessive person that I am, I decided to do a little math, or rather - let Excel do it for me.
Here is a nice chart so you can see the effect that changing to a particular countershaft sprocket will have on the resulting gear ratios. What surprised me most was the huge gap in ratio between first and second gears, but after making the chart and paying attention as I rode to work, I can see it in practice.
I'm attaching the spreadsheet in the spirit of "showing my work", so you all can play around with the data. Also included are speeds in MPH @ 5,000 RPM in each gear for each sprocket so you can see exactly what the resulting difference ends up being.
The tire circumference used in the calculations is for a brand new Kenda K761 and the source of the diameter of the tire came from their website. The gear ratios and primary reduction ratio came from the KLR spec sheet.
Feel free to critique my methodology if you think I got it wrong...
[img]cid:
1.277072203@web63005.mail.re1.yahoo.com[/img]
-Jeff Khoury