Help & FAQs    Search BCF    Members    Groups    Events Calendar
Resend my activation email : Register : Log in 
BCF: Bike Chat Forums


Effects on Gearing?

 Reply to topic
Bike Chat Forums Index -> General Bike Chat
View previous topic : View next topic  
Author Message

Chriss
World Chat Champion



Joined: 07 May 2005
Karma :
PostPosted: 23:00 - 24 Jun 2009    Post subject: Effects on Gearing? Reply with quote
Hi all,

Just looking for some advice and 'what would happen if...' help with regards to gearing. At the moment, my DRZ400SM is a cracking bike, can barely fault it. One small thing I'd like to change, is it not rev so high when doing 80-90mph, and therefore increase the tank rank from 60mile to a tank when ragging it a bit.

If I add a few teeth to the front sprocket, will this work, or is there the risk the bike won't have the grunt to pull to 90mph, and so just lose all my top end? How many teeth would I need to add to the front for it to make any difference?

Thanks in advance, and karma for helpful answers.
____________________
TheShaggyDA: I've got 3 or 4 pairs that predate my wife, so at least 11.5 years old.
 Back to top
View user's profile Send private message Send e-mail You must be logged in to rate posts

Ariel Badger
Super Spammer



Joined: 02 Dec 2006
Karma :
PostPosted: 23:32 - 24 Jun 2009    Post subject: Reply with quote
One tooth will do it although two is better for chain/sprocket wear.
____________________
Bikers make great organ donors, get 115 on your licence today.
 Back to top
View user's profile Send private message Send e-mail You must be logged in to rate posts

Kickstart
The Oracle



Joined: 04 Feb 2002
Karma :
PostPosted: 23:34 - 24 Jun 2009    Post subject: Reply with quote
Hi

Do you have a dyno graph for it and what the gearbox / primary drive / final drive ratios are?

It will probably pull higher gearing, although you might land up having to change down on any slight hill, but suspect not much higher.

All the best

Keith
____________________
Traxpics, track day and racing photographs - Bimota Forum - Bike performance / thrust graphs for choosing gearing
 Back to top
View user's profile Send private message Send e-mail You must be logged in to rate posts

r0b
Renault 5 Driver



Joined: 31 Jan 2005
Karma :
PostPosted: 23:52 - 24 Jun 2009    Post subject: Reply with quote
1930 Ariel wrote:
One tooth will do it although two is better for chain/sprocket wear.



I think it would not be better for chain wear and might even be worse. I don't know if anyone would agree with me but there will be fewer more forceful tugs on the chain at a lower rpm, accelerating chain wear. kind of like how a twin is worse than a 4 for chain stretch cos there are less frequent but more powerful pulses.

on my 600 single i can hear the chain sort of slapping to the beat of the engine as it is stretched Smile
____________________
'92 Honda NX650 Dominator RD02
'98 Kawasaki ZX9R C1
'00 Yamaha TT600R Belgarda
 Back to top
View user's profile Send private message You must be logged in to rate posts

Blue_SV650S
World Chat Champion



Joined: 27 Nov 2008
Karma :
PostPosted: 00:06 - 25 Jun 2009    Post subject: Reply with quote
r0b wrote:
1930 Ariel wrote:
One tooth will do it although two is better for chain/sprocket wear.



I think it would not be better for chain wear and might even be worse. I don't know if anyone would agree with me but there will be fewer more forceful tugs on the chain at a lower rpm, accelerating chain wear. kind of like how a twin is worse than a 4 for chain stretch cos there are less frequent but more powerful pulses.

on my 600 single i can hear the chain sort of slapping to the beat of the engine as it is stretched Smile


I can see your logic there, but I think its accepted that the wear primarily comes from the change of direction of the pins in the chain. i.e. smaller sprocket, the smaller the circumference/diameter, the more each link has to rotate back and then forth on its way round. Also the driving 'load' is spread between fewer links of the chain with a smaller sprocket, increasing the load on each individual link.

As for the OP, I suspect 1 up on the front would be a good move, 2 might be a little OTT. And you should only be doing 70 on the motorway anyway, naughty boy!! Very Happy
____________________
The purpose of life is to fight maturity.
 Back to top
View user's profile Send private message You must be logged in to rate posts
Old Thread Alert!

The last post was made 17 years, 108 days ago. Instead of replying here, would creating a new thread be more useful?
  Display posts from previous:   
This page may contain affiliate links, which means we may earn a small commission if a visitor clicks through and makes a purchase. By clicking on an affiliate link, you accept that third-party cookies will be set.

Post new topic   Reply to topic    Bike Chat Forums Index -> General Bike Chat All times are GMT + 1 Hour
Page 1 of 1

 
 You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot edit your posts in this forum
You cannot delete your posts in this forum
You cannot vote in polls in this forum
You cannot attach files in this forum
You cannot download files in this forum

Read the Terms of Use! - Powered by phpBB © phpBB Group
 
Debug Mode: ON - Server: birks (www) - Page Generation Time: 0.06 Sec - Server Load: 0.87 - MySQL Queries: 14 - Page Size: 46.76 Kb