Join Date: May 2010
Location: Long Island, NY
Bikes: '85 Rossin Super Record, '88 Specialized Sequoia, '10 Raleigh Cadent FT2, '10 Specialized Roubaix Elite
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OP, I went through a similar circumstance when I returned to riding earlier this year. I bought a Raleigh hybrid, and after a month or so I broke my first spoke two spokes. The LBS replaced them, and re-trued the wheel. On a trip to relatives, I broke another spoke. At this point I went back to the LBS and asked for a wheel replacement under the bike warranty. They replaced the wheel and it's been fine since then.
I'd certainly go back to your shop and ask for a new wheel. They knew your size when they sold you the bike, and if the wheel doesn't support you, then they shouldn't have any issue with replacing it.