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What if I change front sprocket from 13 to 12?

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Is it the same as increasing the rear by 2-3 teeths?

I got brand new x-ring chain (114 links) and 51 rear sprocket. I don't think I will ever ride fast enough to get to 5th gear (mostly 2nd and 3rd) so I want to get the most of 2nd, 3rd, and 4th.

Will going down one teeth in the front okay?

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That's what I am going to do to mine. It's easier and there is usually enough adjustment in the chain to make up the difference. Changing the rear sprocket would require lengthening the chain because you would have to change by 3-4 teeth to have the same effect as 1 tooth on the front. It will give you a lot more low end at the cost of top end speed. I mainly ride 1st, 2nd and 3rd gear so dropping a tooth will let me use 4th and 5th more.

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Because the case flares out where the countershaft is. A smaller sprocket will bring the chain lower and closer.

I could be wrong, but better safe than sorry.

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By the way, I hate lubing chains with "regular" chain lube. I mostly use WD40. Will this be a problem on o and x ring chains?

I just hate the mess that regular chain lube makes...

It just flies everywhere..

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