Mount front brakes on rear?

[[email protected]]

Nashbar has a good deal on ultegra brake calipers; I mounted them on
my front wheel. My rear caliper is kinda corroded, and I was
considering mounting another front caliper on the rear wheel... Is
this a good idea?

 

[landotter]

On Oct 28, 12:48 pm, [email protected] wrote:
> Nashbar has a good deal on ultegra brake calipers; I mounted them on
> my front wheel. My rear caliper is kinda corroded, and I was
> considering mounting another front caliper on the rear wheel... Is
> this a good idea?

It should work fine if you use a washer and a regular nut instead of
the recessed one that comes with it.

 

[[email protected]]

On Oct 28, 2:22 pm, landotter <[email protected]> wrote:
> On Oct 28, 12:48 pm, [email protected] wrote:
>
> > Nashbar has a good deal on ultegra brake calipers; I mounted them on
> > my front wheel. My rear caliper is kinda corroded, and I was
> > considering mounting another front caliper on the rear wheel... Is
> > this a good idea?
>
> It should work fine if you use a washer and a regular nut instead of
> the recessed one that comes with it.

Is it ok to do this with a carbon chainstay?

 

[landotter]

On Oct 28, 1:28 pm, [email protected] wrote:
> On Oct 28, 2:22 pm, landotter <[email protected]> wrote:
>
> > On Oct 28, 12:48 pm, [email protected] wrote:
>
> > > Nashbar has a good deal on ultegra brake calipers; I mounted them on
> > > my front wheel. My rear caliper is kinda corroded, and I was
> > > considering mounting another front caliper on the rear wheel... Is
> > > this a good idea?
>
> > It should work fine if you use a washer and a regular nut instead of
> > the recessed one that comes with it.
>
> Is it ok to do this with a carbon chainstay?

I don't see why not.

 

[Stephen Bauman]

On Sun, 28 Oct 2007 11:28:58 -0700, zarfus1 wrote:

>
> Is it ok to do this with a carbon chainstay?

Aren't rear brakes usually mounted on the seat stays?

Stephen Bauman

 

[A Muzi]

[email protected] wrote:
> Nashbar has a good deal on ultegra brake calipers; I mounted them on
> my front wheel. My rear caliper is kinda corroded, and I was
> considering mounting another front caliper on the rear wheel... Is
> this a good idea?

A front is a rear with the brake shoes reversed. Bolt length varies so
if you can, you may. Check the mounting format.

--
Andrew Muzi
www.yellowjersey.org
Open every day since 1 April, 1971

 

[landotter]

On Oct 28, 4:04 pm, Stephen Bauman <[email protected]> wrote:
> On Sun, 28 Oct 2007 11:28:58 -0700, zarfus1 wrote:
>
> > Is it ok to do this with a carbon chainstay?
>
> Aren't rear brakes usually mounted on the seat stays?
>

I'll take Brake Bridge for $200, Alex.

 

[[email protected]]

On Oct 28, 5:22 pm, landotter <[email protected]> wrote:
> On Oct 28, 4:04 pm, Stephen Bauman <[email protected]> wrote:
>
> > On Sun, 28 Oct 2007 11:28:58 -0700, zarfus1 wrote:
>
> > > Is it ok to do this with a carbon chainstay?
>
> > Aren't rear brakes usually mounted on the seat stays?
>
> I'll take Brake Bridge for $200, Alex.

oops yes seat stays.

 

[jim beam]

[email protected] wrote:
> Nashbar has a good deal on ultegra brake calipers; I mounted them on
> my front wheel. My rear caliper is kinda corroded, and I was
> considering mounting another front caliper on the rear wheel... Is
> this a good idea?
>

as pointed out by others, the bolt length thing is not a big deal.
however, you need to be aware that shimano & campy dual pivot brake
calipers have a pivot action that increases toe on the pad as the
caliper closes. [easily observed for yourself if you have the caliper
in your hand - simply squeeze and note how the relative angles of the
pads change as the lever arms move through their arc.] if a front
caliper is used on the rear, the toe is towards the rear of the pads,
not the front, relative to rim direction.

will you notice any effect in practice? maybe some brake squeal, but
probably not. is it correct in theory? no. and iirc, there's a
warning in the shimano literature to the effect that each caliper is
specific to front or rear application and should not be interchanged.

 

[[email protected]]

On Oct 28, 6:48 pm, [email protected] wrote:
> Nashbar has a good deal on ultegra brake calipers; I mounted them on
> my front wheel. My rear caliper is kinda corroded, and I was
> considering mounting another front caliper on the rear wheel... Is
> this a good idea?

If you have an old bolt for the rear, you can disassemble the brake
and replace the longer front bolt with a shorter one required for the
rear. I believe this is even easier to do with dual pivot sidepulls
than the old style single pivots, but it's been a while since I've
taken one of these apart.

 

[jim beam]

[email protected] wrote:
> On Oct 28, 6:48 pm, [email protected] wrote:
>> Nashbar has a good deal on ultegra brake calipers; I mounted them on
>> my front wheel. My rear caliper is kinda corroded, and I was
>> considering mounting another front caliper on the rear wheel... Is
>> this a good idea?
>
> If you have an old bolt for the rear, you can disassemble the brake
> and replace the longer front bolt with a shorter one required for the
> rear.

not with dual pivot - you run into the toe problem i described in my
other post.

> I believe this is even easier to do with dual pivot sidepulls
> than the old style single pivots, but it's been a while since I've
> taken one of these apart.
>

 

[_]

On Mon, 29 Oct 2007 09:33:12 -0700, [email protected] wrote:

> On Oct 28, 6:48 pm, [email protected] wrote:
>> Nashbar has a good deal on ultegra brake calipers; I mounted them on
>> my front wheel. My rear caliper is kinda corroded, and I was
>> considering mounting another front caliper on the rear wheel... Is
>> this a good idea?
>
> If you have an old bolt for the rear, you can disassemble the brake
> and replace the longer front bolt with a shorter one required for the
> rear. I believe this is even easier to do with dual pivot sidepulls
> than the old style single pivots, but it's been a while since I've
> taken one of these apart.

Or run a die down the longer bolt and cut the excess off.

 

[Gary Young]

On Sun, 28 Oct 2007 20:01:29 -0700, jim beam wrote:

> [email protected] wrote:
>> Nashbar has a good deal on ultegra brake calipers; I mounted them on
>> my front wheel. My rear caliper is kinda corroded, and I was
>> considering mounting another front caliper on the rear wheel... Is
>> this a good idea?
>>
>
> as pointed out by others, the bolt length thing is not a big deal.
> however, you need to be aware that shimano & campy dual pivot brake
> calipers have a pivot action that increases toe on the pad as the
> caliper closes. [easily observed for yourself if you have the caliper
> in your hand - simply squeeze and note how the relative angles of the
> pads change as the lever arms move through their arc.] if a front
> caliper is used on the rear, the toe is towards the rear of the pads,
> not the front, relative to rim direction.


According to Shimano spare parts lists (http://tinyurl.com/2kecg9), the
front and rear brakes are identical except for a bolt, a nut and a washer
or spacer. How is this magical effect achieved?

>
> will you notice any effect in practice? maybe some brake squeal, but
> probably not. is it correct in theory? no. and iirc, there's a
> warning in the shimano literature to the effect that each caliper is
> specific to front or rear application and should not be interchanged.

 

[Kerry Montgomery]

"_" <[email protected]> wrote in message
news:[email protected]...
> On Mon, 29 Oct 2007 09:33:12 -0700, [email protected] wrote:
>
>> On Oct 28, 6:48 pm, [email protected] wrote:
>>> Nashbar has a good deal on ultegra brake calipers; I mounted them on
>>> my front wheel. My rear caliper is kinda corroded, and I was
>>> considering mounting another front caliper on the rear wheel... Is
>>> this a good idea?
>>
>> If you have an old bolt for the rear, you can disassemble the brake
>> and replace the longer front bolt with a shorter one required for the
>> rear. I believe this is even easier to do with dual pivot sidepulls
>> than the old style single pivots, but it's been a while since I've
>> taken one of these apart.
>
> Or run a die down the longer bolt and cut the excess off.

But then you'd have cut threads instead of the superior rolled threads
(vastly superior if they're Italian rolled threads).
Kerry

 

[[email protected]]

What if I were to put a spacer on the bolt supplied with the front
caliper to back the bolt down the hole in the seatstay? Would the
increased lever arm bend the bolt?

 

[Kerry Montgomery]

<[email protected]> wrote in message
news:[email protected]...
> What if I were to put a spacer on the bolt supplied with the front
> caliper to back the bolt down the hole in the seatstay? Would the
> increased lever arm bend the bolt?
>
>
If the spacer goes between the brake bridge and the nut; should be OK. If
between the brake bridge and the caliper; maybe not so good.
Kerry

 

[A Muzi]

>> [email protected] wrote:
>>> Nashbar has a good deal on ultegra brake calipers; I mounted them on
>>> my front wheel. My rear caliper is kinda corroded, and I was
>>> considering mounting another front caliper on the rear wheel... Is
>>> this a good idea?

> jim beam wrote:
>> as pointed out by others, the bolt length thing is not a big deal.
>> however, you need to be aware that shimano & campy dual pivot brake
>> calipers have a pivot action that increases toe on the pad as the
>> caliper closes. [easily observed for yourself if you have the caliper
>> in your hand - simply squeeze and note how the relative angles of the
>> pads change as the lever arms move through their arc.] if a front
>> caliper is used on the rear, the toe is towards the rear of the pads,
>> not the front, relative to rim direction.

Gary Young wrote:
> According to Shimano spare parts lists (http://tinyurl.com/2kecg9), the
> front and rear brakes are identical except for a bolt, a nut and a washer
> or spacer. How is this magical effect achieved?

> jim beam wrote:
>> will you notice any effect in practice? maybe some brake squeal, but
>> probably not. is it correct in theory? no. and iirc, there's a
>> warning in the shimano literature to the effect that each caliper is
>> specific to front or rear application and should not be interchanged.

AFAIK rear and front calipers are only different after the mounting
bolt's installed and the shoes reversed. That's been standard industry
practice forever as there's no reason the other parts and hardware
should be different. (exceptions include 'self energizing' models)
--
Andrew Muzi
www.yellowjersey.org
Open every day since 1 April, 1971

 

[philcycles]

_ wrote:
>
> Or run a die down the longer bolt and cut the excess off.

Not really a good idea. These bolts are commonly chromed and the
chrome will ruin the die.
Phil Brown

 

[jim beam]

A Muzi wrote:
>>> [email protected] wrote:
>>>> Nashbar has a good deal on ultegra brake calipers; I mounted them on
>>>> my front wheel. My rear caliper is kinda corroded, and I was
>>>> considering mounting another front caliper on the rear wheel... Is
>>>> this a good idea?
>
>> jim beam wrote:
>>> as pointed out by others, the bolt length thing is not a big deal.
>>> however, you need to be aware that shimano & campy dual pivot brake
>>> calipers have a pivot action that increases toe on the pad as the
>>> caliper closes. [easily observed for yourself if you have the
>>> caliper in your hand - simply squeeze and note how the relative
>>> angles of the pads change as the lever arms move through their arc.]
>>> if a front caliper is used on the rear, the toe is towards the rear
>>> of the pads, not the front, relative to rim direction.
>
> Gary Young wrote:
>> According to Shimano spare parts lists (http://tinyurl.com/2kecg9), the
>> front and rear brakes are identical except for a bolt, a nut and a washer
>> or spacer. How is this magical effect achieved?
>
>> jim beam wrote:
>>> will you notice any effect in practice? maybe some brake squeal, but
>>> probably not. is it correct in theory? no. and iirc, there's a
>>> warning in the shimano literature to the effect that each caliper is
>>> specific to front or rear application and should not be interchanged.
>
> AFAIK rear and front calipers are only different after the mounting
> bolt's installed and the shoes reversed. That's been standard industry
> practice forever as there's no reason the other parts and hardware
> should be different. (exceptions include 'self energizing' models)

since you presumably have these things laying about your store, new in
box, why not dig out both brake calipers and measuring calipers and
measure what i describe?

 

[jim beam]

Gary Young wrote:
> On Sun, 28 Oct 2007 20:01:29 -0700, jim beam wrote:
>
>> [email protected] wrote:
>>> Nashbar has a good deal on ultegra brake calipers; I mounted them on
>>> my front wheel. My rear caliper is kinda corroded, and I was
>>> considering mounting another front caliper on the rear wheel... Is
>>> this a good idea?
>>>
>> as pointed out by others, the bolt length thing is not a big deal.
>> however, you need to be aware that shimano & campy dual pivot brake
>> calipers have a pivot action that increases toe on the pad as the
>> caliper closes. [easily observed for yourself if you have the caliper
>> in your hand - simply squeeze and note how the relative angles of the
>> pads change as the lever arms move through their arc.] if a front
>> caliper is used on the rear, the toe is towards the rear of the pads,
>> not the front, relative to rim direction.
>
>
> According to Shimano spare parts lists (http://tinyurl.com/2kecg9), the
> front and rear brakes are identical except for a bolt, a nut and a washer
> or spacer.

no, that's the parts list for the nuts and bolts, not the caliper arms.


> How is this magical effect achieved?

"magical"??? how about you ask an objective question rather than a
sarcastic one that presupposes ******** instead? you could also take
the time to look for the shimano mounting instructions which do indeed
advise against switching front/rear calipers.

the answer is pivot angle. buy a campy or shimano dual pivot caliper
and observe for yourself.

>
>> will you notice any effect in practice? maybe some brake squeal, but
>> probably not. is it correct in theory? no. and iirc, there's a
>> warning in the shimano literature to the effect that each caliper is
>> specific to front or rear application and should not be interchanged.