Katana of the Month - February 2008  Dane-Kat
 

Welcome to the KatRiders.com forums.

You are currently viewing our boards as a guest which gives you limited access to view most discussions and access our other features. By joining our free community you will have access to post topics, communicate privately with other members (PM), respond to polls, upload content and access many other special features. Registration is fast, simple and absolutely free so please, join our community today!

If you have any problems with the registration process or your account login, please contact contact us.

Go Back   KatRiders.com > Rolling Stock > Tire Talk, Chain & Sprockets

Tire Talk, Chain & Sprockets If it has to do with tires & wheels, then you're in the right place.
Best tire for a Katana? What's the tread life on a particular brand ? Size of a stock rim?
Chains & Sprockets? These questions and so much more are addressed right here !

Reply
 
Thread Tools Display Modes
Old 06-12-2017, 08:13 AM   #1
aussie7
Chicken Strip
 
Join Date: Apr 2017
Location: brisbane
Posts: 19

Question sprocket for lower rpm on highway

ok I've had a look on http://www.gearingcommander.com and not sure what to do

First up I have a Katana GSXF750 2006 model. I live in Australia so speedo is in kmh

I want to lower my rpm from around 5000rpm to around 4000rpm at 110kmh and I would like to know if changing the sprocket size will affect the speedo

I was thinking of going a front 16t and a rear 42t what do you think

Anyone got any ideas what I should do

TIA
aussie7 is offline   Reply With Quote
Old 06-12-2017, 08:32 AM   #2
92xjunker
Neo-Maxiod-Zoomed-Dweebie
Supporting Member
 
92xjunker's Avatar
 
Join Date: Jun 2011
Posts: 10,380
eBay ID: guysmustang

Default

16 tooth front, will require some grinding on the sprocket cover. In order to get where you want you would need a 17/40 setup, not recommended at all. 42 rear is the smallest you could buy, unless you custom order one.
__________________
"I'm sorry, I didn't mean to upset you when I called you stupid. I thought you already knew..."
spammer police
USAF veteran
If your a veteran, join the KR veterans group

Last edited by 92xjunker; 06-12-2017 at 08:49 AM..
92xjunker is offline   Reply With Quote
Old 06-12-2017, 08:38 AM   #3
aussie7
Chicken Strip
 
Join Date: Apr 2017
Location: brisbane
Posts: 19

Default

Quote:
Originally Posted by 92xjunker View Post
16 tooth front, will require some grinding on the sprocket cover.
ahh

is it worth going from a 45t to a 42t rear then

edit will changing sprockets size affect speedo ?

Last edited by aussie7; 06-12-2017 at 08:42 AM..
aussie7 is offline   Reply With Quote
Old 06-12-2017, 08:54 AM   #4
92xjunker
Neo-Maxiod-Zoomed-Dweebie
Supporting Member
 
92xjunker's Avatar
 
Join Date: Jun 2011
Posts: 10,380
eBay ID: guysmustang

Default

Yes it will so, you would need a speedo healer. 42 would yield a 260 rpm drop.
92xjunker is offline   Reply With Quote
Old 06-12-2017, 08:55 AM   #5
aussie7
Chicken Strip
 
Join Date: Apr 2017
Location: brisbane
Posts: 19

Default

Quote:
Originally Posted by 92xjunker View Post
Yes it will so, you would need a speedo healer. 42 would yield a 260 rpm drop.
Thanks 92xjunker

not sure if to go with a 40t or a 38t

edit just looked up speedo healer and its more than I want to spend on the bike, so no mod

Last edited by aussie7; 06-12-2017 at 09:01 AM..
aussie7 is offline   Reply With Quote
Old 06-12-2017, 09:50 AM   #6
shpielers
Kat Legend
 
shpielers's Avatar
 
Join Date: Oct 2011
Location: Oakland, CA
Posts: 3,617

Default

I put on a 42t rear, was commuting 100 miles a day for several years. On my 600, not worth it. I'd do 43 or 44 next time personally. The extra power from the 750 would help a little there.
__________________
2006 Katana 600
1992 Katana 1100
2006 Ninja 250
shpielers is offline   Reply With Quote
Old 06-13-2017, 05:30 PM   #7
Stinger02
Tank Slapper
 
Join Date: Feb 2009
Posts: 488

Default

If you did the gear swap, id just say forget the speedohealer and use your cell phone to show your accurate speed
__________________
Stinger02 is offline   Reply With Quote
Old 06-16-2017, 04:40 AM   #8
aussie7
Chicken Strip
 
Join Date: Apr 2017
Location: brisbane
Posts: 19

Default

Quote:
Originally Posted by shpielers View Post
I put on a 42t rear, was commuting 100 miles a day for several years. On my 600, not worth it. I'd do 43 or 44 next time personally. The extra power from the 750 would help a little there.
Quote:
Originally Posted by Stinger02 View Post
If you did the gear swap, id just say forget the speedohealer and use your cell phone to show your accurate speed
Thanks for the input, at the moment I will leave the gearing stock with 15t front and 45t rear. Can't really afford to make the mod atm

atm at 110khm it is revving at 5000rpm which I can live with for the moment
aussie7 is offline   Reply With Quote
Old 06-16-2017, 09:32 AM   #9
KAT TOY
Miracle performer
Supporting Member
 
KAT TOY's Avatar
 
Join Date: Sep 2009
Location: Athens,Ga.
Posts: 5,174

Default

my 750 has 16/47. that's 5000 @65mph per GPS. so 16 on the front would help. probably won't have to change chain length. only takes minor grinding on cover with Dremel tool. my rear tire is 160/60R17. my speedo is still faster than actual.
__________________
never sleep with anyone crazier than yourself 2011,2012,2013,2014,2015,2016
KAT TOY is offline   Reply With Quote
Old 06-16-2017, 09:15 PM   #10
aussie7
Chicken Strip
 
Join Date: Apr 2017
Location: brisbane
Posts: 19

Default

Quote:
Originally Posted by KAT TOY View Post
my 750 has 16/47. that's 5000 @65mph per GPS. so 16 on the front would help. probably won't have to change chain length. only takes minor grinding on cover with Dremel tool. my rear tire is 160/60R17. my speedo is still faster than actual.
thanks for the input, my rear tyre is also a 160/60/17 so my speedo displays a slower speed than actural speed

for example 5200rpm in 6th gear is
- 108 kmh 160/60/17 tyre
- 111 kmh 150/70/17 tyre

so its only 3k's out
aussie7 is offline   Reply With Quote
Sponsored Links
Reply

  KatRiders.com > Rolling Stock > Tire Talk, Chain & Sprockets

Bookmarks

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not 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


Similar Threads
Thread Thread Starter Forum Replies Last Post
Front sprocket/rear sprocket alignment issue. Jacobz Mechanics 101 6 04-13-2011 12:26 PM
How to lower the rear on an 82 Maxim 550? jiver06 All About Brakes & Suspension 3 07-22-2010 02:10 PM
would like lower RPM's on the highway Fishermanz Tire Talk, Chain & Sprockets 7 03-26-2010 09:29 AM
Chain and Sprocket Kits...lower prices? ctandc Mechanics 101 1 09-15-2008 10:15 PM
Longer/Lower rear brake lever? Bakkendance Mechanics 101 4 08-10-2005 02:46 AM

All times are GMT -5. The time now is 03:13 AM.


Powered by vBulletin® Version 3.8.8
Copyright ©2000 - 2017, Jelsoft Enterprises Ltd.
Katriders.com, Copyright ©2004 - 2017

Like Cigars? Check out Vitola.org