9/16/14 7:29 PM

LBS got the TRP calipers in and on today. They have much much better modulation than the BB7s. Called Dual Pivot due to both sides moving the pads in instead of the floating caliper. Good LBS I'd say. River City Cycles, PDX.

Fixed the heel strikes and clearance problem thankfully. Even the cable route is 100% better.

TRP top, BB7 Bottom.

<img src="http://coupekiss.host-ed.me/images/ttf/spyre-Roubaix.jpg" >
<img src="http://coupekiss.host-ed.me/images/ttf/SL4-BB7-rear.jpg" >

Last edited by Sparky on 9/16/14 8:19 PM; edited 1 time in total

9/16/14 8:19 PM

Those have to be the coolest mechanical calipers I have yet seen!

And they're light too, right?

9/16/14 8:26 PM

149 grams per with the SLC carbon actuator arm. A whole 9 grams ea. lighter than AL actuator non SLC models supposedly.

They just look like they are designed for a road bike. the BB7s are MTB looking for sure. Even though they are road calipers with the appropriate pull etc.

I think the BB7s pulled were the SLs which would put them very close in weight. They feel a lot better, so if they weighted more it would be alright. ;) Did I type that??

And a thumb cable adjuster on the caliper too.

Another shot:

<img src="http://coupekiss.host-ed.me/images/ttf/SpyreSLC-sideR.jpg" >


Internet better Pic:

<img src="http://www.cpsc.gov/Global/Images/Recall/2014/14127/2-14127%20Spyre%20SLC%20LARGE.jpg" width=320>

9/17/14 2:45 PM

The base 2015 disc Roubaix appears to both have the CG-R post AND the TRP Sryre brakes, but not the SLC version. Also I noticed FWIW the upper line Roubaix disc models have 140mm discs, Shimano brake setup.
The base Roubaix has 160mm rotors with the TRPs.

With the 160mm rotors the TRP have adapters. None on the 140mm setups it seems.

Thus the opinion I seek from those with disc brake experience.

Any reason not to goto 140mm Rotors and loose the spacer/adapters? I have only used 160s, and one bike with a 180/140 combo.

After the second ride on these new calipers I have to say when the pads get hot they maintain the same feel. Where-as the BB7 changed feel and sound when hot. Same on my Juicy setup on the 29er. TRP spec says sintered, which I think the Avids use as well. So far I like the TRP better hot performance. [better all performance]

I wonder if the feel staying constant is that the temp is closer on both pads as a result of the dual pad pull? Dual Pivot as TRP call it, but both side get into the act instead of the caliper float on the Avids.

9/17/14 8:18 PM

...i say 140s are all you need in back -- even at your, ahem, weight.

all depends on the duty cycle:
-short hard braking, rear is irrelevant due to weight shift.
-extended moderate braking, rear is increasingly important to share the thermal load.

i dont hit extended downhills, so i'm probably not a relevant person to this discussion.

9/18/14 8:40 AM

I've read that Shimano's Freeza rotors allow one to downsize a rotor for a given braking load, at least in terms of thermal concerns.
A seemingly small improvement in this respect is actually a timely big deal for bike companies who are trying to design fashionably-small and lightweight brakes/rotors into their road bikes.

9/18/14 9:25 AM

"Shimano's Freeza rotors"


Saw those, some technology there as compared to a plain steel disc.

Last edited by Sparky on 9/18/14 1:16 PM; edited 1 time in total

9/18/14 12:52 PM

...they can melt in extreme use. note the oozing inner AL layer.

<img src="https://fbcdn-sphotos-e-a.akamaihd.net/hphotos-ak-ash4/q71/s720x720/1069865_512381345506859_12509604_n.jpg">
<img src="http://www.bike-magazin.de/uploads/tx_saltnews/ac/acf432b1eed3af62d7a1b5787c1d32ad3fa47a40.jpg">

9/18/14 12:54 PM

I wondered about extreme heat. I thought a bonding issue possibly. Would not have expected that.


Also wondering about pad wear on road VS MTB.
My friend with 8" discs on the Tandem sez they last a long time on his battleship. He said years, but I have only seen it out a handful of time, much like ours.

9/18/14 5:40 PM

Those pictures only tell us what we already know, that is, that any brake system has it's own thermally-induced limits.

What the pictures don't tell us is how any particular all-steel rotor would hold up during the same test, and whether the melting aluminum temperature threshold causes any more or less-seriously abrupt brake fade/failure than whatever failure mode affects a hotter steel rotor during identical tests of both kinds of rotors.

It seems impressive that the overheated rotor in the pictures stayed in one piece.

Is there a story about how the pictures rotor(s) got to looking that way?

9/18/14 8:06 PM

"It seems impressive that the overheated rotor in the pictures stayed in one piece."

Agree...

"Is there a story about how the pictures rotor(s) got to looking that way?"

I'd also like to parse though that as well, should it exist.

9/19/14 5:29 AM

...having had Avid rotors get so hot that they changed color and there was smoke coming off of them, steel rotors can survive very high temps. Those same rotors are still on my 26" MTB and they still work fine.

9/19/14 7:49 AM

AL is a poor material for the rotor, good for the carrier as AL carries heat away from the rotor.

maybe one could wafer in some Ti to save weight instead? not much prolly.

or just go to ceramic or carbon-carbon rotors, but then you have to figure out some other way to shed heat since it's such a poor conductor.

9/19/14 2:53 PM

Well, a crash right in front of me on today's ride. I was 3rd and the front guy just hooked a left. Maybe I saw it sooner than the guy in front of me. But I stopped with the discs without it being a close call really. Glad the guy behind me was off center, he went by on the right with his back wheel skidding. The 2nd hit the first guy who is big, and did not even get knocked down. He was down for a few, but got up and finished the ride.

I gotta give the brakes some credit, they where just there, I don't think I even skid that I noticed. We were around 16ish making rights and lefts to avoid the main road, so slower than when going straight for longer periods thankfully.

I have some miles on the bike now, and once I sorted out the crank noises and the TRP brake are on, I can say not disappointed with the ride for the coast at all. The weight could be better, but in function insignificant really. On a long hill today, I dropped a few riders I usually don't, we do that hill often. And I don't feel that great today either..