It has been a long time since the last R20 upgrade thread so looking forwards to follow your upgrade.
I would say the R20 has a great frame and a great potential. If you want a great bike you need to do the upgrades.
A lot of peopel has posted about the R20 upgrades so make sure you read before starting to avoid inventing the wheel twice.
I think Sixty fivers bike "Forrest" is one of the most uppgraded R20 bikes out there. He welded on a new rear triangle. You`ll find some photos of it in this thread
http://www.bikeforums.net/folding-bi...ur-photos.html
and all over the BF plus in the R20`s own forum:
THE RALEIGH TWENTY
The R20 must be the most popular folder for upgrades out there
https://www.google.no/search?q=R20+f...+forum&start=0