Blind

Converted my bike to all dura-ace 7700 group, but I'm stuck on the brakes. The 7700 calipers that came with the group I bought do not have enough reach.

If I'm measuring this right, I need ~70-75mm of reach (from center of brake bridge hole to brake surface on the rim).

What are the best brake calipers I can get that will fit, the tektro r559's?
I also want to be able to run larger tires, these are temporary 700x23 or 25's that came with the wheelset I bought, I plan to run 700x32's.



I found these dia-comp's in a bin at the local bike recyclery so I grabbed a pair for $10 just in case I couldn't find anything else long enough, but the brake power from these is -horrible-! I commute on this bike and sometimes have to stop fast to avoid cars, these I can pull the levers to the bars and not lock the tires up...

c23

https://sheldonbrown.com/home-drop.html

Blind

Lol, no thanks too ghetto for me.

thirdgenbird

If you don't mind modern brakes, tektro has some decent dual pivots. My wife has them on her commuter (fenders and 700x35 tires) and they seem to work pretty darn well. There is flex, but not as much as I would have thought.

thirdgenbird

I just saw your 559 reference, I think this is what my wife has and there is gobs of room for 35s and fenders.

Daveag

How about Dia-Compe Mod 750 centerpull brakes? Should have the reach and they work.

onespeedbiker

I would say you named the best brake for the job;Tektro r559. Even with those you will like not be satisfied; the long arms lose you a lot of leverage.

Blind

Looking at the specs on those they should have enough reach, would they have more or less brake power than the Tektro r559? To convert to center pull I just would need a cable hanger with housing stop, right?

onespeedbiker

This may work for you. Not sure exactly how it works, but if you can clamp the brake lower it just could work. https://www.tracksupermarket.com/inde...jv69migj6neoc7

Here's a photo of how it works on the front

thirdgenbird

I still think the tektro 559 is the best option. It won't be as good as a set of 7700 calipers but they slow me down better than some other short reach calipers I've tried. A set of koolstop pads would probably make them even better too.

Blind

I'm 95% ready to order 559's right now, I'm just trying to make sure I order the nutted version for my old school frame.

I know the ones here:
https://harriscyclery.net/product/tek...r-set-3153.htm

Are definitely nutted, but at the same time I need to order a 28.6 to 31.8 FD shim and would like to save on shipping, the one from HC is $11 and special order/out of stock.

Niagara has the shim I need for $3.85 in stock, and also sells the r559's.

https://www.niagaracycle.com/product_...ucts_id=728004
I think these are the ones I want, because these cheaper ones say recessed nut.
https://www.niagaracycle.com/product_...ucts_id=440666

Most reviews of the r559's I'm finding seem to be very positive, I can't imagine going from my super long reach (70-95?mm) single pivot dia-comp's to these newer tech dual pivot's wouldn't be a huge leap in brake power...having a quick release to pop the wheel off will be amazing too, I get lots of flats on my commute (%^@%$^ goathead thorns!) and having to loosen then re-adjust the brake cable is very annoying, so I usually fix my flat then finish my ride with only 1 functional brake and adjust it again once I get to the office/home...

bobotech

Tektro 800a?

https://www.modernbike.com/itemgroup....175524&TID=367

Cheap double pivot calipers.

17.99 for the pair.

Kimmo 

Man, all that frikken daylight looks pretty ghetto to me.

How keen are you on this frame?

thirdgenbird

The cost increase of the 559 is worth it on a DA 7700 equipped bike.

If he uses 700x35 tires and/or fenders it will look fine.

dwellman

So. . . brazing on a couple canti bosses is out of the question?

3alarmer 

+1 on Tektro....can't beat them for the price. +1 on the longer your arms, the less happy you will be.

Before you do this, spend less money and find yourself some Kool Stop pads for the brakes you have.
I have a similar setup on my Raleigh Sports commuter. With those pads, I stop fine.

mudboy

I'm running Tektro 559's. They're nice calipers.

fietsbob

Because they are massive, U brakes don't flex much when the reach is bigger...

of the centerpull brakes.. Paul's Racer is the tops, these days.. Made in USA..

Blind

It's the only 68cm frame I've been able to find that didn't look stupid, I'm 6'5" and it's a 100% perfect fit for me. This is my bike and it isn't going anywhere

fietsbob

C&V, Older kit, Universal, classic, sidepull-brake
was often longer reach in the back..

You can get away with it with an L shaped shoe backup stop-plate
that hits the chainstay, under braking force, to limit the arm flexing.
common original part back then..

there are center pull road brakes too, Weinnman a common supplier
that may have been what was on that frame originally
before it was stripped

it is what was done back then .. note the shorter reach on the fork.

thirdgenbird

I vote you add a set of VO fenders and a proper alloy seatpost.

Blind

don't think I need fenders, I commute in socal, lol.

I do want a nicer seatpost, unfortunately the DA kit I bought came with a 27.2 post and my bike uses a 26.4, so I stuck the DA post on my ironman bike for now...I'll get a nicer post eventually. Right now it needs a front derailleur 28.6 braze-on adapter, r559's, a water bottle holder seattube clamp adapter so I can have a water bottle, and I still need to swap my dual sided clip/platform pedals over. But it's getting there!

Kimmo 

68! Fair enough... but guys like you who are right on the edge of the bell curve are generally out in the cold unless you go custom. Looking at where you have you seat, IMO you should definitely start saving for a custom frameset. IIRC, in a place like California where there'd be a few framebuilders around, you can get one for maybe less than $700 or something...

What are those cranks, BTW? I dig the old Record and DA stuff, but looking at a pair of 70s DA cranks I've got here, they're prolly a bit flexy unless you're a real beanpole.

If it has mudguards, my interest in the bike's aesthetics usually evaporates. But for mine, that's still too much gap for a 35mm tyre; you could fit a motorbike tyre in there. I've always felt that method of seatstay attachment looks downright agricultural (like bolts on the other end, even on otherwise sweet carbon); fastback or wishbone FTW.

thirdgenbird

I have a decent 26.4 going to waste in my parts bin.

Kimmo 

Does it have enough adjustment range to work back to front?

Looks like this bike needs a TT post, or one with a circular rail clamp assembly...