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Recreational Cyclocross and Gravelbiking This has to be the most physically intense sport ever invented. It's high speed bicycle racing on a short off road course or riding the off pavement rides on gravel like :The Dirty Kanza". We also have a dedicated Racing forum for the Cyclocross Hard Core Racers.

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Old 04-25-13, 03:55 PM   #26
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Originally Posted by Ozan Guner View Post
U have ultegra br-cx 70 ? those are discounted right now was planning to buy them, would there be distinctive difference from the brakes i have ?
Ironically, I used to have the brakes you have now, so I can probably give you a meaningful answer if you're patient with my long-windedness.

There really aren't a lot of ways that one cantilever brake can be substantially better than another. In theory some flex more than others, and that might rob a little of your braking power. Some have nice features like barrel adjusters built into the straddle cable attachment mechanism. Some are a bit lighter than others. Some look better than others. The biggest difference, though, is in design (i.e. brake geometry). Skip the next paragraph or two if you don't want to think about brake geometry.

Cantilevers allow for nearly infinite adjustment in mechanical advantage, so whatever you have you can tweak them to have more power or more wheel clearance. The biggest variable is the width of the brake arms. Wider brakes like you have have a wider range of setup parameters in which they don't completely suck, but within most of that range they are less responsive to adjustments. Low profile brakes have a narrower acceptable range, but a higher maximum mechanical advantage. Medium profile brakes (like the CX70) attempt to strike a balance between these two. Look at the graph on the MAITOY link and you can kind of visualize this.

Anyway, what I'm getting at is that braking power is a function of mechanical advantage, and mechanical advantage is determined by brake geometry and straddle cable height. That said, too much mechanical advantage will make the brakes feel terrible.

I haven't actually crunched the numbers, but a brake like the CX70 probably offers a bit more mechanical advantage than you can get without having the straddle cable really close to the tire on your wide profile brakes. The trade off is that if you don't have it set up just right it will suck. Shimano attempts to mitigate this trade-off by providing you with a (nearly) idiot-proof setup process. They give you a fixed length link wire (like a straddle cable but slightly different) and have you measure a few things on your bike to select the right spacer combination. If you follow the instructions, you get pretty good performance out of the brakes.

I think the CX70's offer more stopping power than the Tektros you have (which I believe are CR720's), but they don't allow as much clearance between the brake pad and the wheel as the Tektros. I've done a lot of muddy CX races with the CX70's and have never been bothered by that. Shimano did a nice job of getting most of the brake body away from the wheel and that's where most mud accumulates anyway. If you aren't racing or riding otherwise through muddy fields, you probably don't care about that. Another thing you might not notice if you don't race is that it can be easy to catch your leg on the rear brake as you hop on the bike with wide profiles in the rear.

I also think the CX70's are really nice looking, though I understand opinions about that vary.

In short, I think the CX70's are a nice upgrade over the CR720's, but you can almost certainly get acceptable performance out of the CR720's. If you tuned the brakes you have for optimum stopping power, you probably wouldn't notice a huge improvement with the CX70's.
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Old 04-26-13, 08:06 AM   #27
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People will rag on Tektro and sing praises for TRP, funny that.
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Old 04-26-13, 09:30 AM   #28
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So as i understood from your message,i dont need to change tektro for a cx 70, it will only improve the performance as any other component upgrade nothing more. So my other option is mini v brakes of trp like 8.4cx, but i have a question. Are they compatible with tiagra brake levers ?
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Old 04-26-13, 10:38 AM   #29
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Step 1, understand very basic mechanics http://en.wikipedia.org/wiki/Lever



Quote:
People will rag on Tektro and sing praises for TRP, funny that.
Tektro is the mass Production high volume majority of sales . millions,
ship to the Build factories.

TRP is the Development and Technical part and makes parts for the Racing
Higher end of the pro bike Market.

YGWYPF.

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Old 04-26-13, 11:08 AM   #30
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Originally Posted by Ozan Guner View Post
So as i understood from your message,i dont need to change tektro for a cx 70, it will only improve the performance as any other component upgrade nothing more. So my other option is mini v brakes of trp like 8.4cx, but i have a question. Are they compatible with tiagra brake levers ?
If you have 10-speed Tiagra then you should get the TRP CX9 brakes, but if you have 9-speed Tiagra then the CX8.4 will work for you.
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Old 04-26-13, 01:25 PM   #31
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If you have 10-speed Tiagra then you should get the TRP CX9 brakes, but if you have 9-speed Tiagra then the CX8.4 will work for you.
Okay , i appreciate the advices , its settled then, i ll buy cx 8.4 if i decide to change my brakes, thanks everyone.
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Old 04-26-13, 05:09 PM   #32
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I use mini-vs with ultegra 6700 brifters. For the type of riding you are describing i see no reason at all to drop $100+ on the trp brakes. I have the tektro bmx 926 brakes and they work great for commuting and for riding the same trails I ride my mtb on. I switched the crappy pads for koolstops inserts and just used the insert holders from my cr720.

In my opinion canti breaks suck. I have read many posts on how great they are once they are properly installed and setup, how to get perfect results. They still suck. If all I used my cross bike for was racing, then cantis would be fine. For riding in traffic where stopping matters, commuting in the rain and snow, for pulling 2 kids in a bike trailler, for riding mtb trails, I'll stick with brakes that work.
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Old 04-26-13, 09:01 PM   #33
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One problem with mini-V's, which I guess I should have mentioned sooner, is that they don't leave a lot of room for fenders with fat tires. If that's an issue, you can get regular V-brakes and use Travel Agents.
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Old 04-27-13, 12:38 AM   #34
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i'm not planning to use fenders or anything like that, so its ok
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Old 04-27-13, 07:03 AM   #35
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If you replaced the too-short main cable so the straddle cable could be lowered, those brakes would almost certainly work fine.

But if you really are determined to replace them, I could give the old ones a home.
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Old 04-27-13, 01:14 PM   #36
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If you replaced the too-short main cable so the straddle cable could be lowered, those brakes would almost certainly work fine.

But if you really are determined to replace them, I could give the old ones a home.
Sure, Go ahead and message me the price you have in mind for set, i only used them for 250kms,and as u can see from the pictures there's not a single scratch on them

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Old 05-19-13, 07:28 PM   #37
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One problem with mini-V's, which I guess I should have mentioned sooner, is that they don't leave a lot of room for fenders with fat tires. If that's an issue, you can get regular V-brakes and use Travel Agents.
i've been searching about these TRP8.4CX AND 9CX brakes and in most places they say get 9cx if u use new shimano levers ( i have tiagra 4600). Which ones are new , which ones are not ? as i said i have tiagra 4600 shifters, is it old or new ?
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Old 05-20-13, 10:42 AM   #38
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For Tiagra 4600 is the new stuff, so you'll want CX 9 with those. For the sake of anyone else who finds this thread, 5700 for 105 and 6700 for Ultegra were the place where the new cable pull got introduced. I expect the forth-coming 6800 Ultegra will also have that cable pull, though there's a chance it will be different yet again. I'm not as up on Dura-Ace, but I think 7900 and 9000 follow the "new" Shimano standard.
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Old 08-17-13, 12:57 AM   #39
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i've been searching about these TRP8.4CX AND 9CX brakes and in most places they say get 9cx if u use new shimano levers ( i have tiagra 4600). Which ones are new , which ones are not ? as i said i have tiagra 4600 shifters, is it old or new ?

TRP 8.4s with Ultegra 6700 levers provide enough stopping power to lock up both wheels with ease.........
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Old 08-17-13, 10:19 PM   #40
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Any time I see Tektro I know brakes don't work well. They are the most inexpensive brand name out there. Switch to something better including pads and the difference is huge
Not true at all. They work just fine when properly set up.
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Old 08-18-13, 12:20 PM   #41
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They are the most inexpensive brand name out there.
hardly .. the QC of those in Tektro's stuff .. OEM Spec'c'd by specialty-Bike Companies , we get in LBS,

is pretty mid range there is a Cheap,worse , and a Pricier, better on either side of them..


OP may be fine , if they just replace the Original Black pad inserts
with Kool Stop Salmon compound.

I've done that with my new TRP adjust-in-place plain post, brake shoes.

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Old 11-11-13, 12:25 AM   #42
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I`m now running Dura ace 9000 levers with CX70 cantis and the breaking performance is far better than expected!! much better feel than the TRP 8.4/Ulterga 6700 combo so don`t feel I`ve lost much breaking power.... really impressed...
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Old 11-17-13, 04:51 PM   #43
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CR720s are pretty well regarded for "cheap" cantis. Play with the setup and swap the pads for Kool Stop Salmon and they will likely be just fine.

That said I'm going to be sampling the CX 8.4 Kool Aid with my next build.
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Old 11-18-13, 02:09 PM   #44
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Mini Vs and don't look back. That's what I did. Well eventually I got a Paul Components Mini moto, which is the same concept but better. It has better clearance for wide tires and fenders than a mini-V. Cantis are always problematic as a front brake, especially on a cross frame. Yes, there are tricks but they still suck. Until a couple a weeks ago I didn't race my bike either, but I didn't have a problem with the Mini motos in a race either.
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Old 11-19-13, 08:50 PM   #45
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You should look at the TRP 8.4cx's They are mini V-brakes and they are awesome.
This is what I run and they are fantastic.
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Old 12-02-13, 11:27 PM   #46
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Ever since last year when I switched to Avid Shorty Ultimates, I don't want any other cantilever brake on my cross bikes.

http://www.sram.com/avid/products/sh...mate-rim-brake

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Old 12-02-13, 11:50 PM   #47
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Shorty Ultimates are indeed fantastic. Not cheap, but worth it if you have the dough and/or a hookup.

The best and cheapest canti upgrade is a fork crown mounted hanger. Sadly most carbon forks don't play nice with them.
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Old 12-03-13, 06:46 PM   #48
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Full size linear pull brakes have tons of power and modulation. I just switched from the elegance of road brakes and find full size linear pulls equally good. If you grab a travel agent you can run them with brifters, although admittedly this is not my setup. They can sequel until they break in.

http://problemsolversbike.com/products/travel_agents/

My setup:

http://www.bikeforums.net/showthread...tching-to-1x10
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Old 12-04-13, 08:58 AM   #49
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Ever since last year when I switched to Avid Shorty Ultimates, I don't want any other cantilever brake on my cross bikes.
+1
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