One of the changes that the engineers made in the redesign of the AR was to move the rear brake under the chainstays. Because a few different companies have done that, Shimano has come up with this quick release for the rear brake to make fixing a flat a little speedier.
The brake used on the AR has a very low-profile design and offers plenty of stopping power, in part because each brake arm mounts to its own post, much like U-brakes or cantilevers.
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That’s a pretty cool little piece of kit!
that is very cool. i guess we aren’t at the end of inventing.
Two-post brake mount. Looks like a perfect spot for a Tri-rig Omega SV which would be a whole lot cleaner. Just put one on the rear of my Shiv TT. Very slick and so much easier to deal with. Excellent stopping power and modulation, too.
Different mounting system than the TRP system. See SuperDave’s comment at a different forum So no TriRig until they redo it.
Different mounting system than the TRP system. See SuperDave’s comment at a different forum So no TriRig until they redo it.
TRP is making a version of their original Shiv-type brake the former T92X series will now be available in Shimano Direct Mount standard and have left or right straddle wires to aid cable routing options. It is aero “styled” if nothing else and a bit lighter.
Tough to beat Shimano from a balance of function and price though.
-SD
Has Shimano given any indication how these brakes perform vs. the normal Dura-Ace brakes?
Has Shimano given any indication how these brakes perform vs. the normal Dura-Ace brakes?
“Better than 7900” and “less power than 9000”
I’m not sure I agree. I can skid pretty long.
-SD
Personal pet peeve…what does better mean? Most brakes on a road bike will lock up the wheel with a reasonable lever force. A 700cc wheel is a hell of big moment arm and the contact patch is pretty small. But I think everyone will agree that some brakes are not so great and some are really good. So what is the difference…caliper stifness? linearity of pull (and there force applied to rim)? Something I haven’t thought of?
I guess I was hoping since Shimano is a large company and obviously has engineers behind there products they would avoid saying something like ‘better’ and ‘power’ when there are no real meanings attached to those words.
Personal pet peeve…what does better mean? Most brakes on a road bike will lock up the wheel with a reasonable lever force. A 700cc wheel is a hell of big moment arm and the contact patch is pretty small. But I think everyone will agree that some brakes are not so great and some are really good. So what is the difference…caliper stifness? linearity of pull (and there force applied to rim)? Something I haven’t thought of?
I guess I was hoping since Shimano is a large company and obviously has engineers behind there products they would avoid saying something like ‘better’ and ‘power’ when there are no real meanings attached to those words.
Oh, they have all sorts of data, graphs, wet and dry weather performance metrics, and stats. I haven’t seen the details published publicly. Maybe someone from Shimano can host that discussion. The direct mount gives a much firmer platform for the brake because there is no 6mm diameter steel rod holding all the braking loads perched away from the frame. The caliper pivots are run through the brake into the frame. For the location on our AR models the chainstays are already beefed up for drivetrain loads so it is a logical place for brake to reside. This lets us take material out of the seat stays and provide compliance in an area that otherwise must resist the braking load and fatigue.
Win-win.
-SD
I always wondered about the bottom mounted brake mounts being in tension vs. compression when braking, but you make a really good point about the seat stays getting more and more spindly and less able to take a load in the middle of the span.
Of topic a little bit…thanks for taking the time for participating in this and all the other conversations about the AR & IA here and in other forums. I have really enjoyed the insights and it has really shined a new light on Felt for me.
I always wondered about the bottom mounted brake mounts being in tension vs. compression when braking, but you make a really good point about the seat stays getting more and more spindly and less able to take a load in the middle of the span.
Of topic a little bit…thanks for taking the time for participating in this and all the other conversations about the AR & IA here and in other forums. I have really enjoyed the insights and it has really shined a new light on Felt for me.
The brakes on the fork act similarly to the under the BB ones. Same situation on the forks with the crown already getting beefed up to handle the fork duties.
Don’t hold my comments against Felt, we really should get someone with marketing experience and social tact interacting on forums and social media outside of our own FB.
-SD
Can we order that quick release that is wonderful.