can you please let me know what kind of frame I have
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1Is it steel or aluminium alloy? You can tell using a magnet. – Criggie♦ Jul 15 '17 at 7:47
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Is there any sort of logo or decal on the other side or on the head tube? – Criggie♦ Jul 15 '17 at 7:48
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Do you have any more parts, like the fork and wheels and transmission ? – Criggie♦ Jul 15 '17 at 7:48
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1You answered so quickly @Criggie, that I didn't have time to respond with my usual: "Black bicycle frame. No markings suggest it might be stolen." type of snarky comment. – RoboKaren Jul 15 '17 at 19:24
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1@Criggie - lol. I'll remember that for next time: "Looks like a black bicycle component. Very don't give valuations but if we did, $0.10 - $3." – RoboKaren Jul 15 '17 at 21:59
It's a BMX or a child's bike - built to be a single-speed because of the horizontal rear dropouts.
The external cups on the headset suggest a newer bike, not a vintage.
The brutish-square box section might help identify it - apparently many companies used square box, more so in the rear.
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It's not a Redman. Look at those beautiful welds and tube shaping on the Redman compared to the crap welds on the OP's bike. – RoboKaren Jul 15 '17 at 19:26
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External headset cups are older technology, integrated appeared in the 2000s. This is opposite from bottom brackets. – ojs Jul 15 '17 at 19:55
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@RoboKaren the Redman one was simply an example of box section frames, it was not my intent to suggest that as a brand. Maybe its a home-made frame? TBH I can't really see the welds on the original photo. – Criggie♦ Jul 15 '17 at 21:43
It looks like it is a low grade BMX frame designed for 20 inches wheels. Caliper brake mount time The picture is not clear but looks like it is a steel frame rather than Alloy one.
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Yes, I don't think you can get quite as ugly welds with aluminium (note that steels and most metals used in bikes are all 'alloys'). Check the rear dropouts. I think they might just be using spot welds!!!! – RoboKaren Jul 15 '17 at 19:28
It kinda looks like a red line triple x think 1997 or so with the square tubing but can't tell for sure
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The rear dropouts seem quite different from the Redline bikes I see on Google. – Daniel R Hicks Jul 18 '17 at 3:04
It's a hawk from the 1990's....
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2Welcome to SE - please consider adding some supporting information to corroborate your claim. Also take a moment to read the tour and learn how StackExchange works - its a Q&A site not a common chat forum. Requests for trades, swaps, buying/selling and valuations are all off topic. – Criggie♦ Jan 9 '19 at 10:28
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I'm going to leave this answer in place, and hopefully Jesse will expand it with further info. Otherwise it could be a lead for OP. We'll let the votes speak. – Criggie♦ Jan 13 '19 at 7:14