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I'm looking for a retro road bike and found a Gudereit T30 with a steel frame, 12 gears, and Mavic rims.

How can I compare this bike to more common bikes to figure out its value?

Comparing the shifters and gears seems easy (DuraAce-Ultegra-105), but how do I compare the steel frame and wheels?

Some pictures:

http://cl.ly/image/1g1h2G0c2d2O

http://cl.ly/image/2b2m2G2l0J0w

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closed as primarily opinion-based by Batman, Benzo, freiheit Apr 3 at 17:01

Many good questions generate some degree of opinion based on expert experience, but answers to this question will tend to be almost entirely based on opinions, rather than facts, references, or specific expertise.If this question can be reworded to fit the rules in the help center, please edit the question.

    
another picture: cl.ly/image/3J0A00171L0h –  Penta Mar 31 at 12:12
    
This is a shopping question and is likely to be closed since it doesn't really help the SE format. –  Batman Mar 31 at 12:51
    
Yeah, might be better if you ask how to determine prices in general, based on age of the bike, and the original selling prices, and what other factors can affect the price of the bike. Look for similar bikes in classifieds (online and print) in your area, to determine what other people are asking. The price one can get for a bike often depends on how much biking happens in your area, as this affects supply and demand. –  Kibbee Mar 31 at 12:55
    
I changed the question to fit more to the SE format. –  Penta Mar 31 at 13:02

2 Answers 2

A reasonable estimate can be found using a site like Bicycle Blue Book. This site is a database of used bike sale transactions going back for almost a decade, and has a number of pretty obscure manufacturers listed. You can even add upgrades you have made from the stock and get an estimate of how that changes the value, though it doesn't account for things like racks, fenders and lighting systems you would add to a bike to make it a competent commuter bike.

I've sold 4 bikes within the last 6 months, and all 4 sold within a reasonable range of what was listed on that site.

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The bicycle blue book does not include a Gudereit, which is a German brand. It seems to miss information about a lot of European brands and models yet.

Sometimes a sticker on the frame indicates the build quality. There is a sticker just below the saddle and on diagonal tube almost entirely at the front if I see it correctly. If one of those says something about the type of steel used, this is a great indicator for the build quality.

Besides this, you can only compare it to similar brands with similar parts in your region.

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the sticker on the frame: cl.ly/image/3P293p2p1N1x Raynolds Steel –  Penta Apr 1 at 22:23
    
Raynolds steel is exactly what you want with an old frame like this. 453 is not the highest grade, but this is not a problem at all. This was a mid-range/upper-range bicycle with good parts. If you really wan't a price estimate, you can compare it to other bicycles with a Reynolds frame and the same Shimano parts. Don't compare it to the very top brands of racing-bicycles (Miyata, Pinarello, Colnage, etc.) but compare it to well known general brands (Peugeot, Giant, etc.). This should give you an idea. –  Joost Apr 2 at 8:35

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