My CGR has RS505 (hydraulic) 'brifters', acting on RS785 Calipers
They're operating onto Clarke 'Dirt Dissipation' discs, according to the order history (just checked)
My thoughts & the 'back history' are......………...….
I'd had hydraulics on a (2007) Trek 6000 MTB, & realised how effective they were in bad conditions,
and how powerful they could be! (enough to make the front tyre tread 'squirm' under heavy road-braking (mainly as experiments)
I was using a '7005 - blue - winter - audax' (seems to have different names at times?!), & whilst it was, & still is, a nice bike to ride, it had a trio of main problems.....
(it was bought in June 2013, to replace a 20 year old Dyna-Tech 755Ti that had been downgraded to commuter)
1. It could only take '23' section tyres, with mudguards, & I'd clogged them up on a couple of rides, just with road-silt!
(I'd thought I was getting tired/running out of energy, till I heard the noise
)
2. Given the state of a few sections of road on my commute, & indeed regular ride-routes, a larger air-chamber would be nice (see point 1)
3. Brake wear was as much a problem as the low-clearances, with an average of 2 pairs of brake-blocks per year
So, with that in mind, in early 2017 I started to look for a succesor
I'd been given clearance my
Senior Management to buy a new bike (as she, & daughter were having 3 holidays that year)
Ribble had recently announced the CGR, so I looked at that (given the 'customisation' available)
I'd seen one, whilst calling at 'Squires', but couldn't ask for a ride, as it was a much larger frame size
So, I took the plunge & ordered, which was delayed due (at the time, if I remember) to no RS505 'brifters' in the country
On first ride what was noticed was;
1. The lightness of braking, due to not 'dragging' the inner-cable through the outer (which can degrade over age)
2. Full compression, ie; all effort is applied to the caliper, no stretching the inner-cable, whilst at the same time compressing the outer cable
3. Compared to the cantilevers on my CX bike, some of the effort on that, can go to deforming the seat-stays (
a), on heavy braking (or in bad conditions)
4. The controllability/sensitivity of braking
5. The larger air-chamber tyres, allow a more comfortable ride, maybe at lower pressures - on a greasy surface?
(Schwalbe Durano PP, on mine)
6. More mudguard clearance, as mine is sometimes used in woods/bridleways, such as here, at Haw Park Woods (Waterton Park)
Secondary thoughts were;
My wheels will last longer, due to
- rims not wearing, with brake application (
b)
- sealed bearings, even means hubs lasting longer (as with the Aksyiums, on my CGR)
- larger (air-chamber) tyres that can be used, protect the rim against potholes
- if a pothole is hit, & breaks a spoke/dents a rim, the brakes will still work (or not rub)
So, it's really a 'Win-Win Situation', as wheels last longer, with better all weather braking
Whist there are counter-issues with pad-heat, & the possible 'blueing' of discs, & they do get hot!!!, rotors can't be made out of aluminium (like a rim) as they'd not last)
The size of a rim, does help to dissipate any heat almost instantly in most conditions (especially in this country - not many Alpine passes to descend)
Fork strengthening is definitely required, due to the point of force-application being so far away, in terms of leverage from the crown
a; Even my Pace Research RC100, many years ago, with its Magura hydraulic (rim) brakes, could 'bend' those square section seat-tubes!!!
b; Pad wear, obviously does happen, but this was at about 13 - 14 months, with 'all weather' use
Granted, yes, I could have got more wear out of them, but the lever travel had increased to more than I liked