Re: tightning the top part of chain?
Your chain is too long. You need to start by removing two links. Unless you use a half link, you'll need to take out two complete links so you can resuse the master link. It appears from the photo that you have ample drop-out adjustment to acheive good tension.
Ideally you want 1/2" to 3/4" of slack. No more, no less. I'm not a fan of spring tensioners but rely on distance between the drive and driven sprocket and proper chain/sprocket alignment to keep the chain running smooth. If the sprockets are properly aligned and the tension is within those given above you shouldn't have any chain problems.
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Last edited by 2door; 03-10-2014 at 05:37 PM.