I have been riding for 3months on my hybrid and 3 months on my road bike and still at 34miles. You are fit! Can't wait to hear about you riding your first Century!
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2012 Specialized Amira Elite, upgraded carbon handle bars, Jett saddle 143mm switched to 145mm 2012 Selle Italia Max SLR Gel Flow saddle

2011 Specialized Ariel Sport,suspension post,Serfas Rx Women's Microfiber saddle