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Interesting, thank you!
I'll be interested to hear how you go with this over the next couple of months.
I've decided to just order a pair of the UR300 as it almost feels too cheap to miss for a functioning set of disc brakes! After scouring ebay I've also found an RS505 rear caliper listed as used but working, which they accepted an offer of £15 for, so the way I see it I've now got several options for the price of a new 105 rear caliper.
Big thanks to @coventry_eagle and @snottyotter for sharing your thoughts and experiences. I really appreciate it!
hazzelfrazzel-
That’s why I went down the cheap brake route. There was no way on earth I was paying for a pair of new rs505 calipers for what is now just a grocery getter. So far 200miles in, they seem fine you can still lock up the rear and do impressive stoppies.
Oh I’m using some old cheapy Tektro discs as well.
Chaley
I’ve just gone UR300 on my Sequoia flat bar conversion using the existing hoses. They screwed straight on without a problem. If I go back to drops I’ll just screw them on the RS505 levers. The discs that came with them have “resin only” stamped on them, but I’m sure you can use whatever you want with your road discs.