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Think its time for a new sprocket?

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Aug 3, 2007
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#1
this is my front sprocket off my cr125

http://www.putfile.com/pic.php?img=6236838
http://www.putfile.com/pic.php?img=6236837

im pretty sure its time for a new sprocket, this is a 12 tooth and the rear sprocket is a 52 tooth, is this the best gearing for a bike that will mostly see jumps?

i bought a new front sprocket. also, does this look like normal wear for a front sprocket, or does it look like there is a problem with alignment?

thanks,
mike
 

_JOE_

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#4
Are you serious? "is it time for a new sprocket?" :think:
 
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#6
_JOE_ said:
Are you serious? "is it time for a new sprocket?" :think:
:) i was being sarchastic haha.
my main point of the thread was to ask if 12-52 is good gearing for a jump bike.
 
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#10
im looking for the best gearing for jumps and wheelies, i have 2 other bikes and this one will be wheelie/jumps only. the others i bought set up already, 1 for trail riding, 1 a bit meaner for the track.

thanks in advance

mike
 

Jaybird

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#11
The chain being worn out is what ruined the sprocket. If the rear doesn't look like that, it is either a super hard *steel rear, or will look like the front very soon.
*(even a super hard rear will be worn like the front if you continue to run the same chain.)
If the rear has even the slightest bit of deformation at all, change it too.

12/52 gearing is more suited for woods riding in sigle track.
For the track, a 13/49-52 would be a better ratio choice for the 125cc.
 

RM_guy

Moderator /
Damn Yankees
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#12
Naw...that sprocket's fine. Now this one's bad! :laugh: :p
 

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Feb 21, 2007
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#14
I'd just keep it stock ratios and since you are replacing the front sprocket, replace the rear and the chain at the same time. Make sure you scrub your chain well after every ride, and immediately lube it afterwards to keep it from rusting. It will last a long time if you take care of it...
 
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#15
Jaybird said:
12/52 gearing is more suited for woods riding in sigle track.
For the track, a 13/49-52 would be a better ratio choice for the 125cc.
what makes the 13/49-52 gearing better than 12/52 gearing?
whats the difference and how does each apply to each application, sorry for all the questions, im just trying to get the best performance possible for what i need out of my bike.

thanks

mike