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Generally speaking aluminum frames have larger diameter tubes than steel or titanium bikes, but the most obvious is to test with a magnet. If it sticks it's a steel frame. If it doesn't it's probably aluminum. Titanium frames are still so rare that you are very unlikely to buy one w/o knowing.

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βˆ™ 14y ago
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βˆ™ 12y ago

well you can have a chromoly frame which is usually the one these days or aluminum or still but chromoly is light and strong

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Q: How can I tell what type of BMX bike frames I have?
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A street bike is a type of BMX bike, so your question can't be answered.

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