Join Date: May 2008
Location: Star City, NE
Bikes: 2008 Surly Long Haul Trucker "The Truckerino"
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Butt pain is normal for a 13 mile ride if you haven't yet acclimated to the saddle and mileage. Give it a couple days to heal if you have to. If I take a couple months off the bike it usually takes me about 3 to 5 good rides before my posterior gets used to the saddle and don't suffer anymore.
Saddle height should be such that your knee should only be slightly bent when your foot is at the bottom of the pedal stroke. Don't point your foot or anything, just use a natural motion. Basically you want to be able to properly extend the leg for maximum power without over-extending, which will cause the hips to rock from side to side. If you can feel your hips rocking then lower the saddle a bit, etc.
Saddle tilt should be be such that you don't slide forward or backward, and you don't feel parts digging into your ...junk and stuff. Starting from level, you might want to tilt the nose up slightly to keep from sliding forward. Very small adjustments can feel very noticeable so take it a tiny bit at a time.
If your saddle has a lot of padding you might notice that it pushes into the soft tissue and makes your junk numb. This is bad. You only really want pressure and padding on the "sit bone" region where the majority of your sitting weight is supported on the bike. You *may* need a new saddle at some point but wait until you've got more miles and saddle time to see how you adjust first. However, if you're not getting numb or abrasion sores you'll probably be OK. For now at least.