Sprocket change. 14 & 51 to a 13 & 49

5 replies to this topic
  • supermo26

Posted March 07, 2016 - 03:32 PM


Looking to make bike a little less torque and a little faster on the top end.


What would going from a 14 tooth front 51 tooth rear to a 13 tooth front to a 49 tooth rear do?


2005 yz450f with a 4 gear transmission.

  • Krannie McKranface

Posted March 07, 2016 - 03:37 PM


www.gearing commander.com 


14/51 is (not) LOWER gearing than 13/49



Edited by KRANNIE, March 10, 2016 - 08:32 PM.

  • JDLowrance

Posted March 07, 2016 - 07:12 PM


Actually 13/49 (3.77) is shorter/lower than 14/51 (3.64) and will do the opposite of what you're after. Sounds like you're looking for less snap and a little more top speed. Dropping a tooth or two from the rear and maintaining the 14 front will get you there.

When I desert raced my 03 450 (4 speed) I was running 15/42 (2.80) which would still loft the front in 4th with ease and top out at 175kph (110mph).

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  • BongKarem

Posted March 10, 2016 - 08:10 PM


Here i found a great solution, a gearing program :thumbsup:


Hope that helps


Posted April 03, 2016 - 10:19 AM


Here i found a great solution, a gearing program :thumbsup:


Hope that helps

They left off 06 WR450. 


Posted April 03, 2016 - 10:28 AM


The guy I bought from gave me a box of old stuff. Theres a 15 and 44 in the box, used but will work for testing. What he put on it is 14/50. I'm getting 35 mpg now. I like the way it handles, it will do 75 on the hwy but still handle the slow technical stuff. I'd like to get a bit better gas mileage without losing the technical. Any suggestions?

Edited by DESERTJUL, April 03, 2016 - 10:28 AM.


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