I d on this ti bike

[joglo]

If it's indeed Aluminium - I was earlier not sure - I do have a guess, and the front tyre plays than indeed a role,
Corratec had a second line for MTBs mit 90ties, called "Ap + daun" (German pronounciation of up & down ), those had nice polished Aluminium frames with smooth weldings.

This one looks also with regards to the cable Shops close:
https://www.mtb-news.de/forum/t/verschenke-corratec-up-down-rahmen.945590/
I've seen once a Ap + daun with a small APro Logo at the derailleur hanger, so they might have been produced at APro in Taiwan.
The Bikes have offered a good value for the money, some came with M900 group.

 

[Rideon]

I’d say it’s brazed or something looks nothing like any alloy frame I’ve had over the years but it’s possible

 

[Rideon]

A 30 yr old alloy frame without a mm of corrosion ??

 

[d8mok]

A 30 yr old alloy frame without a mm of corrosion ??

Yep easily.

 

[ishaw]

A 30 yr old alloy frame without a mm of corrosion ??

My 93 team RTS has no corrosion, still looks new. Ti tubing is much thinner than alu so take a look at the top of the seat tube and see how thick or thin it is.

 

[Woz]

What does a magnet say?

Dropouts look thin, plus to me it appears there may have been some lacquer / coating scrapped off.

 

[Frankenorange]

Now with pics; it is 100% an aluminium frame that has had the welds smoothed out. One of many that were mass produced in asia during the 90's. With some decent components it will make a fun and capable bike that will be a little different in not having great big poopy welds at every tube junction. No amount of willing will magic this into a ti frame.

 

[89RingleAddict]

I know what bar ends you have!
Kudos, never seen b4, besides mine!

 

[greencat]

Looking at the pictures again, I'd say lacquered aluminium. It might not be anything special, but it's been nicely finished and has some good parts on it. Maybe previous owner has painted spokes with nail varnish perhaps? Someone obviously loved it at some point!

 

[Rideon]

Thanks for the info the poor bugger ride this for 20 yrs thinking it was ti - he’s now pushing up daisys and will never know the truth