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Everyone still agree, you don't change a 20,000 mile chain without changing both sprockets too.
I replaced my rear at @26000. When i placed the old one on top of the new one, there was no obvious difference. I think i will run the "new one" (@20,000 miles on it so far) 'til it is obviously worn. Who knows how long that may be. I installed a new chain and front sprocket last weekend. 
Howbeit when He, the Spirit of truth, is come; He will guide you in all truth:
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