the link is not valid. (BMAN beat me to it)

Having said that did you consider modeling it w/ the wheel in place and rotating? It is significantly more complicated to model, but would be incredibly interesting and arguably more accurate a test case.

A person would need to decide what kind of wheel/tire to model - just one of them would end up taking a significant amount of time without a serious render farm available.

Chris

Not saying it wouldn't take a little computational time to solve. I think the most simplistic would probably be a flat disk. I would believe that most of the interaction would happen at the tire and the brake bed area and you wouldn't have to account for things like spokes which could add a level of complexity to the simulation.

It should be fixed now, sorry about that.

Pyrahna,
I believe that Adams makes software to do dynamics and fluid modeling simultaneously, but I don't have access to that kind of stuff.
The computation time really blows up as soon as you added even modest complexity. The simulations in that technical article took about 2 hours, and that included only the brake, fork, stear tube, and cable.
Matt

Adams software models, for lack of a better term, dynamic kinematics. There are hooks in ADAMS for both flexible bodies (i.e. bending parts under load) and I believe hooks for forces applied by aerodynamic forces. What I am talking about w/ dynamic fluid movement has to do with the fact that their would be no steady state solution if spokes were whirring around in the model. There would be pulses due to the spokes getting close to other objects. There are plenty of CFD programs that do quasi-dynamic (Navier-Stokes) that would do what you are looking for without spending the 6 figures needed for ADAMS. I believe there are actually some open-source stuff that would do the CFD that you are looking for. But this is all getting outside my engineering comfort zone.

finally got brake finished ...and no that cable is no way near as close to tyre as it looks:-)

simkins brake on p3 blackwell time bandit

how does that tektro brake setup feel in terms of stopping power?

fine for a tt bike no problems at all

Just put together my new front caliper made from a transition caliper and a tektro!

M@TTY

Do you have the shaped rubber caps that cover the pivot bolts?

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No but im trying to find some! if i cant get hold of some then i can do quite a good job on them with electrical tape!


M@TTY

I'd try with Specialized...either through Specialized customer service or your LBS. Just say that you lost some off of your Transition brakes and you need replacements...

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On the rear of my TT bike, I have the Tektro R726 which is what the rear brake on the specialized is based on and thought I would add a qualifier as the manufacturer of my frame made no allowances for a cable guide/stop for the brake cable where it exits the downtube ahead of the brake (note the aluminum Tektro aftermarket cable stop in the image above). Without a cable stop/guide, braking with such a setup will not be very good as the cable will first flex to take up slack before it actually starts actuating/closing the caliper.

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Did you purchase those transition brakes separately or were they from another bike? Will LBS sell just the transition brake? Was it difficult to combine the transitions and tektro brakes?

Unless you are wanting the brakes from the Specialized for the annodized calipers, the brakes are somewhat based on the Tektro R726.

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I've been trying to find that set of brakes but none of the LBS have it or even heard of it.

The one I have came with the Chinese time trial frameset I ordered and searches have not yieldded very good results tracking them down on the web as it typically is not an item most LBS/online sites carry but I would think it could be ordered from the distributor. An alternative would be the Oval Concepts A700 rear brake although if this is for an under/behind the bottom bracket style frame, then I doubt that brake will be very good either as I have tried both with my bike and neither offers what I would call positive braking action.

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I got the transition brake from a guy who had lost the grub screws from the front brake on his transition frame so specialized sent him a new caliper! I think it would be very difficult to get hold of one and I just got lucky! I had to drill to holes in the tektro part but other than that it wasnt to difficult!

M@TTY

I have a freind who is a specialized dealer so he will be my first port of call!

M@TTY

Just fitted it today(after powder coating )still trying to source the rubber bungs so taped up over the bolts for now! M@TTY

It is now close now to 18 months since the Egg brakes became available. Any feedback from users?

Love them. I rode the entire seaon on the Simkin brake. The stop very well although its about going fast and not stopping. This year at age 53 I rode a 20K personal best averaging 27.4 mph. It wasn't the brakes alone but an important part of the things that got me there.

no way man, i think it was definitely the brakes

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https://lshtm.academia.edu/MikeCallaghan

http://howtobeswiss.blogspot.ch/