HEADS UP!!!

Site upgrade in progress... Core site functions are working, but some non-critical features/functions will be temporarily unavailable while we work to restore them over the next couple of weeks.

Please post any bugs you encounter, but before you do, check to see if it's already listed.

Thanks for your patience while we work to improve the community.

Sign in to follow this  
Followers 0
fastenuf4u

Getting smaller rear sprocket, a question

4 posts in this topic

I am going from a 49 tooth rear sprocket to a 47 tooth and wondered if it would be better to shorten the chain or just push the axle back to make up for the difference? I have always heard shortening the wheelbase can help the bike turn better but I wanted to see if anyone on here had some real world experience with either of these options.

The bike by the way is an 03 YZ450F with 4 oz. Dr. D flywheel weight and complete Dr. D exhaust. I feel on the track I mainly ride that 2nd doesn't give me enough speed to clear some jumps but 3rd lugs a bit and I have to downshift in the air to get ready to get back on the gas. I would rather just have a longer 2nd gear which is why I am going down rather than up! Thanks.

Share this post


Link to post
Share on other sites

You have come across one of the major dilemmas of moto life. Yes, shortening the wheelbase won't hurt turning, and will improve traction in some conditions. Lengthening it will improve high speed stability. If you're on a track in second most of the time, shorter (shorter chain) is probably the way to go. But then you lose the flexibility of going back to 49 (without another chain). Moving the rear wheel also changes the leverage and action of the shock, which may require slight comp and/or rebound adjustments in certain cases. Sag /preload changes slightly also. All of this is why sometimes changing the front sprocket (one tooth) is a better option. It's all about compromises. Changing the front will have less effect on wheelbase and suspension. In either case now you have to make sure 1st doesn't get to high. There's no easy answer...have fun. :ride:

Share this post


Link to post
Share on other sites

I run mine with a 15/49 (vs. 14/48 stock), which is the same as a 14/46. It's a little high for some tracks, and I need to use first some, but all the gears are really long legged, and the wide torque curve makes it easy to use one or two gears for the entire track.

There are a couple of places where I use a 14/49 to bring second down a little and make the gears seem closer spaced.

But on the chain, assuming you are using a good strong one, and are also using high grade press fit master links, what would be wrong with using two masters part of the time and a add-in/leave-out link to make up the difference? I do.

Share this post


Link to post
Share on other sites

Thanks for the replies. I can't believe I forgot you could increase the number of teeth by 1 on the countershaft sprocket to equal between 2-3 teeth on the rear. It would have saved me a bundle and allowed me to use the same chain and not mess with the setup too much. I guess since it should be arriving today I will have to just run a 14/47 setup and probably shorten the chain. This bike has enough pull I doubt I would need to go back to a 49 for any reason, if I do need that extra pull I will just downshift! Thanks again.

Share this post


Link to post
Share on other sites

Create an account or sign in to comment

You need to be a member in order to leave a comment

Create an account

Sign up for a new account in our community. It's easy!


Register a new account

Sign in

Already have an account? Sign in here.


Sign In Now
Sign in to follow this  
Followers 0