# 12 to 13 Tooth Front Sprocket - Nothing to Write Home About

**URL:** https://community.electricforum.com/t/12-to-13-tooth-front-sprocket-nothing-to-write-home-about/1738
**Category:** Do It Yourself (DIY)
**Created:** [September 18, 2011, 3:07pm UTC](https://community.electricforum.com/t/12-to-13-tooth-front-sprocket-nothing-to-write-home-about/1738 "2011-09-18T15:07:31Z")
**Posts on this page:** 1
**Page:** 1

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### Author: ![Gregski](https://avatars.discourse-cdn.com/v4/letter/g/ecc23a/32.png) [@Gregski](https://community.electricforum.com/u/Gregski)
#### Post date: [September 18, 2011, 3:07pm UTC](https://community.electricforum.com/t/12-to-13-tooth-front-sprocket-nothing-to-write-home-about/1738/1 "2011-09-18T15:07:31Z")

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Replaced the 12 tooth front sprocket with a 13 tooth one on my 1989 Suzuki Katana GSX600F yesterday. The rear is the original stock 47 tooth one. I didn’t have to add any links to the chain after adding 3 or 4 initially for the conversion as the motor sits further away than the engine/transmission had.

I think I may be getting 2 MPH more on the top speed maybe a little more somewhere around high 30’s, ie 38 MPH. The good news is the bike is not any slower off the line. So I question all the people who told me electric bikes need to run a 5:1 gear ratio, that or I misunderstood their advice.

Posted this here so more eyes could see it, as the Motorcycle section of this forum is on hiatus, lol

Bike Specs:  
[ul]  
[li]Mars ME0709 motor (heavy)[/li][li]48 Volt Alltrax 300 amp controller (soon to be upgraded to 72 volts)[/li][li]four 55 Ah sealed lead acid batteries (soon to be six)[/li][li]48 volt Elcon 20 amp on board charger I[/I][/li][li]Magura Twist Grip Throttle (kinda cheap and plasticky)[/li][/ul]

![](http://gregandsandy.com//wattana/pics/small/DSCI0007.jpg)

![](http://gregandsandy.com//wattana/pics/small/DSCI0009.jpg)