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Could have been ridden during winter with lots of salt or some chemical was used to clean the chain and never washed off.
So a group of older guys on our team all purchased the latest model Cannondale aluminum frame circa 1990's. Within one year of riding outside and inside on the trainer, all but one bike were a corroded mess. Seatpost stuck, paint bubbling, anodized parts trashed. These guys sweat acid. The one guys bike still looked pristine. I asked him and he said he washed and dried his bike after every ride. He had sweated through 2 steel bike frames so he knew it was a problem but now knew how to keep it from happening.
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All used parts sold as is.
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