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Somebody's 07RR was an organ donor for my 600 Micro Sprint. I'm looking to open up a few more gearing options, and am struggling to find countershaft gears smaller than 13t. I could really use an 11 and a 12 to get the ratios I'm looking for, based on the rear sprockets I have available. Running 520 chain...

Any ideas where I might find them?



 

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Discussion Starter #3
chain life

With that small of a radius you'll damage the chain. that's why nobody makes them.
11's and 12's are available for the R6, which is the more popular motor in the class.

In our environment, chains are relatively disposable anyway... Pulling around 800lbs through dirt with close to 30" of rear tire width, chains aren't expected to live forever.
 
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