Mount front brakes on rear?

Quoted message said:

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.

landotter said:

Quoted message said:

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?

Quoted message said:

landotter said:

On Oct 28, 12:48 pm, [email hidden] wrote:

Quoted message said:

Quoted message said:

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?

Quoted message said:

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.

zarfus1 said:

Is it ok to do this with a carbon chainstay?

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

Stephen Bauman

Quoted message said:

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

Stephen Bauman said:

zarfus1 said:

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.

landotter said:

Stephen Bauman said:

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

Quoted message said:

Quoted message said:

Is it ok to do this with a carbon chainstay?

Quoted message said:

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

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

oops yes seat stays.

Quoted message said:

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.

Quoted message said:

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.

Quoted message said:

Quoted message said:

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.

Quoted message said:

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.

Quoted message said:

Quoted message said:

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.

jim beam said:

Quoted message said:

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?

Quoted message said:

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 hidden]> wrote in message
news:[email hidden]...

Quoted message said:

Quoted message said:

Quoted message said:

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

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?

<[email hidden]> wrote in message
news:[email hidden]...

Quoted message said:

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

Quoted message said:

Quoted message said:

Quoted message said:

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?

Quoted message said:

jim beam said:

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 said:

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?

Quoted message said:

jim beam said:

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

_ said:

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

A Muzi said:

Quoted message said:

Quoted message said:

[email hidden] 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?

Quoted message said:

jim beam said:

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 said:

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?

Quoted message said:

jim beam said:

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?

Gary Young said:

jim beam said:

Quoted message said:

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.

Quoted message said:

How is this magical effect achieved?

"magical"??? how about you ask an objective question rather than a
sarcastic one that presupposes [censored] 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.

Quoted message said:

Quoted message said:

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.