Street Triple

Main Street Triple Board => Street Triple - General Discussion => Topic started by: Snox on July 14, 2019, 11:52:59 AM

Title: Sprockets and real world differences
Post by: Snox on July 14, 2019, 11:52:59 AM
Got a street r 13 plate and have a -1 tooth front sprocket ready to go on . Question is...is it worth changing the rear to a different size ? I am looking for low down . 100 mph + doesn't bother me .
Any one messed about with sprockets wanna suggest best way to go with this .
Title: Re: Sprockets and real world differences
Post by: Tomspurs on July 14, 2019, 12:42:05 PM
Just do the front...that way you dont have to lengthen / shorten the chain, which is the expensive bit...summary: Front sprocket £10 odd, rear £50 odd...chain £90 odd...simples  :028:
Title: Re: Sprockets and real world differences
Post by: F5 Dave on July 14, 2019, 08:55:52 PM
I went 1 smaller and decided, on my 11, that it didn't do anything for me.   So I put it back.  But I took a couple of links out and loved the difference of a shorter wheelbase. 
Title: Re: Sprockets and real world differences
Post by: gosling 1 on July 14, 2019, 09:53:57 PM
I tried a -1 front, +1 rear 520 set up for a while. Acceleration in the lower gears was fun but overall I preferred the stock gearing. First and second are a bit tall on the '13-'16 bikes with the stock gearing but third through sixth seem feel just right to me.
Title: Re: Sprockets and real world differences
Post by: dunf on July 15, 2019, 06:53:11 AM
You can go pretty far with the changes if you’re not bothered about top end as much. I used to run -2 front, plus 5 rear for a track bike gsxr at knockhill.  :002:
Title: Re: Sprockets and real world differences
Post by: JulesW on August 05, 2019, 04:59:48 PM
I run front -1, rear +2, standard chain. I really like the acceleration improvement and the lower top speed doesn't bother me at all. This set up is fun on the road, great on track and ok when touring.


Title: Re: Sprockets and real world differences
Post by: OuzoStreet on August 09, 2019, 12:43:22 PM
Here's a spreadsheet to allow you to see what changes different sprockets would make in cold, hard numbers. It doesn't tell you anything about the way the bike woukdt feel of course, but you get the idea. Usefully, if you change the "Maximum power RPM" cell to whatever revs you like to cruise at, you can see what speed that will give you. Hope that makes sense.

By the way, I've got it set up for my first gen 2009 bike that has lower gearing. Just enter the figures for yours from the manual...

Sorry, I had to put it in a zip file to upload it. Here's a screenshot of what it looks like:
Title: Re: Sprockets and real world differences
Post by: JulesW on August 09, 2019, 01:11:43 PM
Gearing commander is a good web based resource.

https://www.gearingcommander.com/
Title: Re: Sprockets and real world differences
Post by: 2012StreetT on August 09, 2019, 10:31:23 PM
*Originally Posted by OuzoStreet [+]
Here's a spreadsheet to allow you to see what changes different sprockets would make in cold, hard numbers. It doesn't tell you anything about the way the bike woukdt feel of course, but you get the idea. Usefully, if you change the "Maximum power RPM" cell to whatever revs you like to cruise at, you can see what speed that will give you. Hope that makes sense.

By the way, I've got it set up for my first gen 2009 bike that has lower gearing. Just enter the figures for yours from the manual...

Sorry, I had to put it in a zip file to upload it. Here's a screenshot of what it looks like:

This is brilliant, thank you
Title: Re: Sprockets and real world differences
Post by: OuzoStreet on August 09, 2019, 11:10:33 PM
*Originally Posted by 2012StreetT [+]
This is brilliant, thank you

You're welcome. If you want a laugh, here's my ZX10r. Crazy numbers, which is why the Street Triple is more fun around town etc  :001:
Title: Re: Sprockets and real world differences
Post by: Tangowaggon on August 21, 2019, 08:31:42 AM
I don't like the gearing on my 2010 STR, geared for racing , love the handling  but I'm not arsed about maxxing it out every gear so I went the other way, +1 front and -5 rear ( I think) to give an 18.8% increase in final drive & changed the ECU to correct the speedo.
Ok, so I lost a bit of the punchy, off the mark acceleration and the bike now pulls 100mph in 2nd but
The bike is soooooo much quieter & smoother when you're stuck cruising at 50mph+ in top gear
I just ride the twisties in 2nd / 3rd instead of 4th / 5th
It is still happy trundling along the flat at 30mph in top
I've had over 200 miles on a tankful though that was 40 miles with the light on! In Scotland with no fuel for miles, scary! Still only put 16.5 litres in when I found an open garage.
Overall, a small loss of off the mark acceleration but a massive improvement when just cruising and fuel economy.
Title: Re: Sprockets and real world differences
Post by: JulesW on August 21, 2019, 05:18:46 PM
*Originally Posted by Tangowaggon [+]
I went the other way, +1 front and -5 rear
Overall, a small loss of off the mark acceleration but a massive improvement when just cruising and fuel economy.

Interesting to read this, thanks for sharing Tangowaggon