Frame material was not a deciding factor in my last commuter/MTB buy. The bike that had the features I wanted and was in-stock at a good value was aluminum. It gets locked up just the same as it would if it were carbon fiber.
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Genesis 49:16-17
"Well, well!" said Holmes, impatiently. "A good cyclist does not need a high road. The moor is intersected with paths and the moon is at the full."