I got in all the parts yesterday, minus the saddle and handlebar, and spent today getting it all installed. Surprisingly, there were almost no issues at all. The only problem I had was that when I removed to v brakes, the brake bosses came out with them. Not a problem as I had a set of titanium bosses that I wanted to install. I had been debating installing a front derailleur, I have the adapter to mount it, but the current setup has a low enough gear that a granny gear is not necessary. I am likely going to have to add a larger chainwheel, I ordered a 56t Dura Ace unit, but it will take a few weeks to arrive.
For those who want to know, converting to 20" wheels is remarkably easy. The wheels mount with no issue, there is plenty of clearance for the wheel and tire. The only issue is that the v brakes will no longer reach the rim. I bought a set of v brakes which have longer slots for the pads, so they can be moved out far enough to reach the rims properly. There are also adapters available which allow you to use standard v brakes. Low cost v brakes with the longer slots cost about $40 per set. Adapters run $60.
I converted the square taper BB with Dura Ace Hollowtech unit, the chainset installed without needing any spacers or modifications. After a test ride, I can say that it works incredibly well. The bike is lighter and smoother. Shifting is fast and precise, braking is great. The 20" wheels lower the angle of attack, and make the suspension work even better. I added a "Silky Ride" elastomer to the rear suspension, though the ride feels much the same afterward.
The Fretta rides better than my old Birdy, and is light years better than my Brompton. I am looking forward to this week's commuting.
