Surly make steel bikes for people are are serious about cycling. Steel is significantly stronger and more durable than its aluminum counterpart, making it an excellent choice for mountain bikes. Steel-framed bikes are able to absorb more blows with suffering damage. Make sure you remember every tube, including the head tube and fork legs. Add a light coat of grease to the BB threads, the ends and inside of the head tube, and the seat tube, then install your parts and go ride. Let it air out and gel up for a day or so, then clean up any extra on the outside of the frame.
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