If you see a frame with a sticker "Corsa Extra" and do not see the letter X on the BB cover then:
- your frame is built with SLX tubing, but it belongs to the approximately 3% of series frames where the letter X was not placed for some reason
- your frame is custom built from an unusual tubing mix
- your frame is built for profi
- your frame is built with Reynolds tubing (753 or 653)
- your frame is Corsa Extra Max
- the previous owner stuck "Corsa Extra" on for a joke.
Lack of frame size marking indicates unusual geometry or sclerosis.
Always check the sticker on the steering tube (if it survived), it contains a lot of information.
Z8755 - 1988