Join Date: Aug 2003
Bikes: '03 Fuji Roubaix Pro; '03 KleinGi Attitude; '06 Soma Rush; '04 Surly Cross-Check; '06 Soma Rush; '07 Scott CR1 / Chorus
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Don't buy a bike because it's cheap. Buy it because it fits. If the used bike happens to be the right size, then it might be worth considering.
If you're talking about a Specialized Crossroads Sport, it's very similiar to a Trek 7100.
One advantage of buying new from a bike shop is that they'll spend some time with you helping fit the bike to you. If you're on a comfortable bike that fits you well, you'll be more likely to want to get out there on it and ride!.
Another advantage is that they mostly include some sort of maintenance plan on the bike for you. Most will at least give a 30 day tuneup. After the first few rides on a new bike cables will usually stretch a bit and need a bit of adjustment. Some bike shops will even offer lifetime adjustments on the bike, usually for the original buyer only. Something to think about... it can save a heckuva lot of money for you in the long run, plus in buying new you'll be able to develop a relationship with the shop.