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Old 11-12-12, 05:17 PM
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Need help with IGH chain tension..

So I bought a MEC Chance commuter bike with an Alfine 11 internally geared hub.
When I got it the chain seemed to be tensioned almost perfectly. Since then I've ridden about 500 kilometers and the chain has begun to sag a bit. In the picture below I've used string to show how much sag the chain has. It's about half an inch. It looks easy enough to tension. The rear hub drop outs are on metal slides that ca be adjusted forward or backward to tension the chain.
I'm just wondering if the chain even needs to be tensioned. I've read that chains don't actually stretch and it's so new that I'm confused how it has begun to sag.
Any advice is appreciated.

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