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Old 08-17-19, 06:39 AM
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I always use external butted seat tubes with 1.1 or 1.2 mm wall thickness. The thickness depends on what brand tubing I buy and not a personal preference for either. The only issue that I've found with using external butted seat tubes(for 27.2 seat posts) is the very limited option for 29.8mm seat post clamps. The only options I've found are Thomson, some Chinese ones on Ebay(Zoagear) and I think Nova sells one. There are a few QR clamps in that size, but I don't consider them a serious option.
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