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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.
Chaley-
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
Yeah, I've just done some quick internet research and it sounds like the pistons on UR300 are resin rather than ceramic.
On this bike I actually have 160mm rotors on there front and back already despite it being road. I decided to increase from 140mm last year because I use it to drop my kid at nursery and on the way home we come down a very steep and twisty descent where I'm not gonna be bombing it down the same way I would it if were just me on the bike and I've got the extra weight of a hamax carress and a 2yr old on the back. I currently use the adapters front and rear to space out the existing calipers to 160mm.
I read that the UR300 are to be used with resin pads only. Is that correct? I'd thought that it was the disc that would dictate only being allowed to use resin, rather than the caliper, but I am clearly not incredibly knowledgeable on the subject.
Other considerations are that I'd need to change pads. Obviously a new caliper comes with the pads included. If I keep the current front caliper and only change the rear, then I'll have 1 type of pad on the rear and a different type on the front. That's okay, but I think in the long run I'd ideally also change the front to the same caliper. It's probably just a matter of time before that one goes.
Questions I have:
You are right that the UR300 is cheap as chips. I could get both front and rear from Ribble (including lever, hose, and pads) for £35 delivered, which is far cheaper than any of the other single calipers from the 105 or ultegra that I can find for sale online. Depending on answers to the above questions, I'll probably just order up both a front and rear.