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Old 10-22-11, 08:39 AM
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With low profile rims you need more spokes. Lower profile rims are less stiff so they need more support.

Open Pros are well into the less stiff category. In fact they are kind of floppy. You'd do better to use KinLin XR270s, which are both stiffer and lighter. Open Pros list at 440g but I have seen recent reports of them coming in at 20+ grams over.

You can't go by weight alone when determining a durable wheel construction. The kind of riding you do and your riding style have an effect on how hard you are on wheels. If you ride a lot of steep climbs and ride out of the saddle a lot your rear wheel will get much more stress than one under someone who does mostly flat or gentler slopes and stays in the saddle.
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