The TR5AR was one of two 500cc models produced in 1961 for the American market. Because it was only built for one year, examples are few and far between. A good example of one will be on auction at the National Motorcycle Museum in June, and you could pick up this beauty for less than a new machine.
The auction is taking place on the 2nd June 2017 and is being organised by H and H. It is taking place at the National Motorcycle Museum (Coventry Road, Bickenhill, Solihul, B92 0EL) and entry to the auction is free. If you want to bid on any of the lots then you will need to register, though that can be done on the day (worth checking though).
The TR5AR was only produced in 1961, along with it's scrambler twin the TR5AC, before Triumph decided to produce the T100SS instead. It was given the rather long name 'Road Sports Trophy', initially featured Energy Transfer Ignition, and was finished in Kingfisher Blue and Silver. The difference to the AC model was mainly cosmetic with the AR having twin low exhausts and the AC having a siamesed low-level system. The petrol tank was actually a stressed frame member on this machine (the AC had a bolt-on tube to strengthen the frame as it only had a small tank).
If you are interested then viewings will start from 8am on the 2nd June, and the various machines will be on auction from 13:00.