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Old 01-22-2013, 05:32 AM   #32624
thumpididump
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Joined: Jul 2009
Location: Germany
Oddometer: 2,163
IMO, you're wise to revert to a 13T on the front because of the reduced risk of the chain destroying your swingarm. A 47T will yield slightly shorter gearing and your chain length will only require 110 links.

Changing one tooth up front is roughly equivalent to 3 teeth in the rear.

The stock combo 13/43 has a ratio of 3.31

12/43 = 3.58

13/47 = 3.62

13/46 = 3.53

Good reference here:

http://wr250rforum.forumotion.com/t5...-and-sprockets



Quote:
Originally Posted by ecarnell View Post
Anyone run a dirt tricks sprocket 13/47 combo on their WR?
I've asked on the wr250r forum, but only one reply.

In need of a new chain and sprocket after 12,000km of hard running.
Currently Using a 12T front and sprocket 43 rear - and like this gearing so want to keep this ratio - but back to a 13t front.

Thinking of the F1 13T front, and a YZ47 Rear - and a new Regaina ORN6 O-ring chain (520X120 Links).

Any reason why this wont work (besides new counter sunk bolts required)?

Thanks.
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