Originally Posted by
MetinUz
Here is another idea: start with a touring frame like Trek 720 or Miyata 1000. These should have enough clearance as they were designed for 27" tires. Have a framebuilder replace the seatstay bridge while respacing to 135. Should cost less than $200, though you'll have to repaint the affected area.
This is definitely a good idea...and something I'm considering. The only negative is...I've ridden Miyata 1000s naked before and haven't liked them. I have no experience with the Trek 720. The more I'm thinking about it...the more the Polyvent with a rim change is a really good idea...it's probably either that or a custom. The Vassago is also definitely a possibility.