Join Date: Feb 2005
Bikes: Wife: Trek 5200, C'dale Rush Feminine, Vitus 979 Me: Felt S25, Cervelo Soloist, C'dale Killer V500, Miyata Pro (fixie)
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I have a Felt S25 tri-bike and I ride in a very aggressive position (i.e. very flat back with a big drop from seat to handlebars). I did a 70 miler yesterday and I'd estimate that at least 85-90% of my time was spent in aero position. The only thing that hurts after these long rides is my neck. Having to keep my head up and looking forward is tough for me. If I were doing a full IM, I'd probably opt for a slightly more upright position, but if I can manage it for 70 miles, 56 miles (for a HIM) is doable.
I try to alleviate the sore neck by not lifting my head so high, but it does hamper visibility a little. You may be more flexible in the neck than I am so it might not be an issue for you. For some people, their backs and hamstrings hurt if they ride in an aggressive position for too long, but it hasn't been an issue for me.
Everyone is built a little different so there's really no way to predict how your body will react after a long ride. I'd recommend not cutting your steerer tube until you've done a few really long rides, just to be sure.
Last edited by Sprocket Man; 04-30-07 at 07:01 PM.