You can, if you wish; nearly all seat posts and pedals come in standard sizes, and you can put your seat or pedals onto the bike we supply. Most travelers decide they'd rather pack light, and quickly get accustomed to the seats and pedals on the bikes we supply. Many people, however, have brought light-weight gel seat covers, which go over the existing seat. These take up very little luggage space, and those with limited biking experience often find them more comfortable.