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Trying to identify this bike frame so I can build it with compatible components, AND so I can calculate it's value. Any help massively appreciated.

bike frame #1

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    How did it end with all identifying details removed and in your possession? The easiest way is usually just asking the seller.
    – ojs
    Commented Jun 29, 2022 at 15:12
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    I would say "Chinese".
    – Daniel R Hicks
    Commented Jun 29, 2022 at 16:20
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    @ojs I found one of my frames literally hanging out of a trash bin. (It's rusted and ugly, but it still rides well.) If it weren't for (1) the bottom bracket stamp and (2) this sort of vintage steel bike being very popular where I live, I would probably have asked a similar question. Though I suppose people taking out the trash and coming back into their apartments with a 40 year old bike frame isn't a common occurrence, it has made me consider that situations like OP's might be similar.
    – jayded-bee
    Commented Jun 29, 2022 at 16:24
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    @jayded-bee your story does not really help with identifying this one, but thank you anyway
    – ojs
    Commented Jun 29, 2022 at 18:49
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    @ojs My comment wasn't about identifying this particular frame, just pointing out that (a) the frame might not have a seller to ask and/or that (b) OP has likely already exhausted their options as far as asking the previous owner goes. (At least, my first assumption is that the questioner had done the bare minimum before posting online.)
    – jayded-bee
    Commented Jun 29, 2022 at 19:07

2 Answers 2

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Actual identification may be difficult. Valuing a frame whose provenance you can’t show is is also difficult. It is possible for me to say a few things.

  1. This is an aluminum frame with an aero downtube and a cutout in the seat tube. And it may take an aerodynamic seatpost, which unfortunately tend to be proprietary to the frame unless the seat tube is round. You will need to check this.
  2. It has what I would normally call track dropouts in the rear. It also has a guide near the head tube (in the downtube) for internal cable routing. Thus it probably isn't a track frame (you could measure the distance between the dropouts to confirm, track frames are 120mm vs 130mm for road). There should be some sort of screw in each dropout to help you adjust how close the wheel sits to the seat tube.
  3. I would have guessed this could be a Cervelo, maybe mid 2000s or early 2010s. However, see the area on the chainstay just above the dropouts? I don’t know that Cervelo ever used that shape. There are no visual matches on this vintage Cervelo bike website.
  4. I would guess this is a triathlon or time trial frame. There weren't many aero road frames from the time period I think this frame is from. One of the prominent aluminum aero road frames from that era was the Cervelo Soloist, and we've established that the dropout design is wrong for Cervelo.
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    The combination of aero features, horizontal dropouts and internal routing ports is indeed very odd. My guess would be some sort of generic aero bike that's had different dropouts fitted to make a track/fixie varient
    – Andy P
    Commented Jun 30, 2022 at 15:02
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It looks similar to an early `90s road bike I had from Mongoose (yes the BMX makers) but with some differences.

enter image description here

Dropped chainstay and high-aspect ratio downtube are similar.

Yours has trackends not dropouts and might have a 120 mm OLD measurement.
Also your top tube is more formed whereas mine was a chunky tube, and a more aggressively aero seat tube+post.

There are many more photos in https://criggie.org.nz/pictures/bikes/mongoose/

We don't really do valuations, other than Aluminium is worth around $6 a kilo as scrap metal, very region-dependent. A bare frame with no provenance and a lot of missing parts before its a bike, is just scrap metal until you build it into a working rideable bike. You don't even have a fork and that's hard to match.

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    Never mind the fork. If the OP needs a non-round seat collar like it looks like this Mongoose has, or a non-round seatpost, those seem likely to be proprietary items. If those are needed, then I have a feeling the project is DOA.
    – Weiwen Ng
    Commented Jun 30, 2022 at 22:14
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    @WeiwenNg i did a bit more digging into this rather strange combination of frame features this evening. I couldn't find an exact match, but it seems frames in this style have some popularity amongst 'trendy' fixie designs. The internal routing on the top tube is used for a rear brake. With a seeming abundance of similar bikes available it's possible OP might be able to get some compatible parts
    – Andy P
    Commented Jun 30, 2022 at 22:30

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