GS 1150 ES 13 tooth front sprocket?

[Dlindberg]

Im thinking about swapping the stock 15 tooth front sprocket for a 13 tooth. I have a new 630 chain on it and 42 tooth rear sprocket.

-but started thinking if the chain would be rubbing the swingarm/ slider - anyone tried this? thanks

 

[Nessism]

I don't know about the rubbing business but I do know moving two teeth in the front is a huge change in the gearing. The bike will rocket off the line but will buzz quite a bit at freeway speeds.

 

[rapidray]

Keep in mind that any time you make the sprocket smaller it makes the bend the chain has to make tighter, this is what increases chain wear. Also, I have NEVER found a need to go less than 14 teeth on a front, & prefer using 15 & gearing the rear accordingly. Each tooth you go up or down on the front is fairly equivalent to going down or up 3 teeth on the rear sprocket. Most of my drag bikes are in the range of 15/47 or 15/48.
Ray.

 

[Dlindberg]

Thanks I see the point in the chain being bent more than might be good for chainwear. Maybe 45 on the rear would be better and a bit more sensible for the street (havent really seen other than 41 or 42 rear up for sale here in europe but must be out there somewhere..)

 

[Buffalo Bill]

Here's a fun link for calculating sprocket ratios.
Gearing Commander

 

[Cipher]

http://tsubaki.ca/pdf/library/the_Complete_guide_to_chain.pdf

Some interesting engineering information

 

[blowerbike]

no no no no no no no

 

[blowerbike]

i have an aluminum rear but i need to count the teeth....it's several more than stock.
14/15/16 is all ok on an 1150...a 13 is just bad news...

 

[Dlindberg]

Thanks! I can get a 14 tooth cheap and easy on ebay here in europe -so I might go with that since a bigger than stock rear sprocket seems hard to find and more expensive... Thanks for the advise on the 13 tooth being no good/ too small for the 1150