The Chamois pad on the bike shorts will help your sit bones whether you mountain bike or road bike. If you are mountain biking on a hardtail, you might want to think about a suspension post for your seat if you are a newbie having a difficult time timing your crouching position off of the saddle on bumps. I'm speaking from personal experience because my sitbones felt soooo much better on my hybrid (with lockout-able suspension) when I went "mountain biking" on trails with my suspension post and biking shorts with chamois padding.
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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



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