Originally Posted by
hermanchauw
Is your frame steel? If yes, you could respace the dropouts to 135mm. Not that hard to do. Just need some ingenuity to execute the surgery. There are some videos on youtube showing this with some homemade tools.
I did this before on an Omitaya Sogno 111. 130mm 6 speed to 135mm 8 speed.
Your Omitaya must be a mountain bike. On road bikes such as the OP's, 6-speed is 126mm and 8-speed is 130mm.