Bike Gearing Calculator (Excel File) - Page 3 - Kawasaki KLR 650 Forum
2008+ KLR650 Wrenching & Mod Questions For repair, maintaining or modifying discussions related to the newly updated 2008 and beyond, Generation 2 KLR650 Motorcycle.

 1Likes
Reply
 
LinkBack Thread Tools Display Modes
post #21 of 39 Old 02-01-2015, 05:53 PM
Neutral
 
Join Date: Feb 2015
Posts: 4
Hi, Im new to motorcycles, KLRs and this forum. I had an idea I was checking out and this "calculator" seemed like it might have some answers. Being not a number minded person, I have a hard time making sense of it.

What I would like to do is get an extra set of wheels with street tires for when I'm not going to be off roading much. I thought it would be cool to also get a different rear sprocket for the "street" to make it a bit faster. I would like for this to be a quick change without having to do anything but swap the wheels and adjust the chain tension.

I have a stock 2014 and like it fine the way it is for the off roading I do. Just thought maybe I could make it a bit punchier on the road with a little tweeking.

Does this make sense? Can I do this and expect a difference worth bothering with?
Frstone3 is offline  
Sponsored Links
Advertisement
 
post #22 of 39 Old 02-01-2015, 06:52 PM Thread Starter
Pretty in Pink, dunno why
 
Tom Schmitz's Avatar
 
Join Date: Feb 2009
Location: Redondo Beach
Posts: 7,445
Garage
Frstone3 -

Welcome to the forum!

What you want to do is perfectly reasonable, in theory.

The stock sprockets are a 15 front and a 43 rear. In order to have a more roadworthy gearing for a set of pure road wheels, you would need to go to a smaller sprocket in the rear. This is why I said 'in theory'. Finding a sprocket that is smaller than the 43 that will fit the KLR is a bit difficult. Not impossible, mind you, but it will take a bit of research.

Also, in order to make a significant difference, you will need to find a rear sprocket that is considerably smaller than the stock one, so that means finding a sprocket with something like 38 teeth on it. You are not going to find that listed as a replacement part for a KLR, so there's where you'll have to do some research to find a road bike with the same bolt pattern and hub boss size as the KLR. Now, if you wanted to go to a bigger rear sprocket, that wouldn't be much of a problem at all, as that's a common interest and there are Kawasaki dirt bikes that share the bolt and hub pattern.

Because of the difficulty of finding the smaller rear sprocket, the common approach is to go to a bigger front sprocket. Going up to a 16 is easy and a 17 is possible, though some work on the sprocket cover is often required.

If you get a prevailing torque nut to replace the stock Kawasaki sprocket nut you'll be able to swap out front sprockets very quickly; it will add a few minutes to the wheel swap-over.

What I do, in order to maintain the gearing as a set, is I swap the front sprocket, the rear sprocket, and the chain when I swap wheels. That way I don't' have to deal with differing wear amounts by mixing components.

As to whether it is worth it or not: Going from a 15 to a 16 is a change of 7%. Cruising at 70mph on stock gearing means the engine is turning over something like 5500rpm. That would change to 5150 rpm. That may turn in a bit better gas mileage, may get into t he rpm range where the KLR won't burn oil, will be less buzzy, etc. You will likely have to shift down for steep grades, though. First gear will be even longer-legged than it is stock, but starting up won't be an issue.

Tom

Tom [email protected]

“Neither of the two people in the room paid any attention to the way I came in, although only one of them was dead.” -Philip Marlowe

“'Why' and 'How' are words so important they cannot be too often used.” -Napoleon Bonaparte


Sting like a butterfly.

Last edited by Tom Schmitz; 02-01-2015 at 06:57 PM.
Tom Schmitz is online now  
post #23 of 39 Old 02-01-2015, 09:19 PM
Neutral
 
Join Date: Feb 2015
Posts: 4
Thanks Tom!
I figured there would be some detail involved. I love the klr just the way it is, and from what I've researched including your input, there's not much one can do to improve on it. I may try to find a smaller rear sprocket but it seems for now it wont make much difference.
I guess if I want to really tear up the road I better get a different bike for it...
Frstone3 is offline  
 
post #24 of 39 Old 02-01-2015, 09:24 PM Thread Starter
Pretty in Pink, dunno why
 
Tom Schmitz's Avatar
 
Join Date: Feb 2009
Location: Redondo Beach
Posts: 7,445
Garage
Yup. Re-gearing the bike will lower (or raise) the rpm at speed, but it won't make the bike faster - it just doesn't have the power to be faster.

If you want faster, ya gotta find a bigger hill, a stronger tailwind, or a different bike.

But if you want an all-around bike that does most everything decently but nothing splendidly, you've got the right bike.

Tom

Tom [email protected]

“Neither of the two people in the room paid any attention to the way I came in, although only one of them was dead.” -Philip Marlowe

“'Why' and 'How' are words so important they cannot be too often used.” -Napoleon Bonaparte


Sting like a butterfly.
Tom Schmitz is online now  
post #25 of 39 Old 02-01-2015, 09:36 PM Thread Starter
Pretty in Pink, dunno why
 
Tom Schmitz's Avatar
 
Join Date: Feb 2009
Location: Redondo Beach
Posts: 7,445
Garage
I went back and checked my notes on gearing. It seems that JT makes a 38 tooth sprocket that may fit.

It is the JTR487.38. It seems to be the same bolt circle and hub boss configuration.

Looking at their on-line catalog, they show it as a valid configuration.

The application is listed as a 'BJ Estrella 250', truly a thing of beauty and a joy forever:


As to real availability, who knows? Worth a shot at MotorcycleSuperstore or similar, even a dealer might be helpful.

Tom

Tom [email protected]

“Neither of the two people in the room paid any attention to the way I came in, although only one of them was dead.” -Philip Marlowe

“'Why' and 'How' are words so important they cannot be too often used.” -Napoleon Bonaparte


Sting like a butterfly.
Tom Schmitz is online now  
post #26 of 39 Old 02-01-2015, 10:49 PM
Neutral
 
Join Date: Feb 2015
Posts: 4
Is there a possibility of a larger rear wheel size that may do the same as gearing change? Would this be comparable/additional option?
Frstone3 is offline  
post #27 of 39 Old 02-01-2015, 11:12 PM Thread Starter
Pretty in Pink, dunno why
 
Tom Schmitz's Avatar
 
Join Date: Feb 2009
Location: Redondo Beach
Posts: 7,445
Garage
No, there's no room for a tire that's much larger in diameter.

Take a gander back there; it's pretty tight.

Tom

Tom [email protected]

“Neither of the two people in the room paid any attention to the way I came in, although only one of them was dead.” -Philip Marlowe

“'Why' and 'How' are words so important they cannot be too often used.” -Napoleon Bonaparte


Sting like a butterfly.
Tom Schmitz is online now  
post #28 of 39 Old 02-04-2015, 08:09 PM
Neutral
 
Join Date: Feb 2015
Posts: 4
So, if I were to get a 38 rear and a 16 front, would I have to use a smaller chain or could I adjust out the slack? I dont know why but I am just really excited to try this... Thanks again for all your info.
Frstone3 is offline  
post #29 of 39 Old 02-04-2015, 08:27 PM
1st Gear
 
Join Date: Feb 2015
Posts: 17
Sweet thanks
chuckjr is offline  
post #30 of 39 Old 02-04-2015, 08:43 PM Thread Starter
Pretty in Pink, dunno why
 
Tom Schmitz's Avatar
 
Join Date: Feb 2009
Location: Redondo Beach
Posts: 7,445
Garage
Frstone3 -

I say yes, you can do it. I have been known to be wrong, though.

The stock combination is a 15/43 for a total of 58 teeth and the chain wraps 29 of those.

A 16/38 is a total of 54 teeth, and the chain wraps 27 of those.

As far as the chain is concerned, it's not much of a change.

Tom

Tom [email protected]

“Neither of the two people in the room paid any attention to the way I came in, although only one of them was dead.” -Philip Marlowe

“'Why' and 'How' are words so important they cannot be too often used.” -Napoleon Bonaparte


Sting like a butterfly.

Last edited by Tom Schmitz; 02-04-2015 at 08:53 PM.
Tom Schmitz is online now  
Sponsored Links
Advertisement
 
Reply

Quick Reply
Message:
Options

Register Now



In order to be able to post messages on the Kawasaki KLR 650 Forum forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.

User Name:
Password
Please enter a password for your user account. Note that passwords are case-sensitive.

Password:


Confirm Password:
Email Address
Please enter a valid email address for yourself.

Email Address:
OR

Log-in










Thread Tools
Show Printable Version Show Printable Version
Email this Page Email this Page
Display Modes
Linear Mode Linear Mode



Similar Threads
Thread Thread Starter Forum Replies Last Post
gearing up for the street Raydog KLR & Other Motorcycle Related Discussion 38 02-29-2016 12:34 AM
Shim Calculator Site DXKLR 1987 to 2007 Wrenching & Mods 4 09-08-2011 09:05 AM
Gearing Question TrabFTW KLR & Other Motorcycle Related Discussion 18 12-21-2010 12:12 PM
Gearing and Top Speed ekms377 KLR & Other Motorcycle Related Discussion 3 04-16-2008 06:53 AM

Posting Rules  
You may post new threads
You may post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On

 
For the best viewing experience please update your browser to Google Chrome