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Old 01-12-09 | 09:28 PM
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MNBikeguy
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Joined: Mar 2007
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From: Minneapolis, MN

Bikes: 05 Trek 5200, 07 Trek 520, 99 GT Karakoram, 08 Surly 1X1

Pit vents- definitely. That's where your heat is being generated from.
Reason why most decent shells have them; to retain or disburse heat.
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