A trick for extending brake reach a bit, plus more

In article <[email hidden]>, Ryan

Cousineau said:

I've posted some pictures and notes on using V-brake hardware to extend
the reach of caliper brakes slightly. One unnoted downside: slightly
less pad life due to taking the pad down at an angle.

Also, if you scroll down, more pix of version 1.0 of BMX LX. Then, a
bird.

Beautiful robin. A concern about the brake setup: As the pads wear,
will they not come into contact with the rim sidewall at an ever
decreasing distance from the rim edge? (i.e Possibly rubbing against
the tire sidewall)

luke

Quoted message said:

Beautiful robin. A concern about the brake setup: As the pads wear,
will they not come into contact with the rim sidewall at an ever
decreasing distance from the rim edge? (i.e Possibly rubbing against
the tire sidewall)

Precisely why you should obsess over the bike and check it over with
calipers ever 5 miles.
--
Phil, Squid-in-Training

In article <[email hidden]>,

Luke said:

In article <[email hidden]>, Ryan

Cousineau said:

I've posted some pictures and notes on using V-brake hardware to extend
the reach of caliper brakes slightly. One unnoted downside: slightly
less pad life due to taking the pad down at an angle.

Also, if you scroll down, more pix of version 1.0 of BMX LX. Then, a
bird.

Beautiful robin. A concern about the brake setup: As the pads wear,
will they not come into contact with the rim sidewall at an ever
decreasing distance from the rim edge? (i.e Possibly rubbing against
the tire sidewall)

An interesting question. The answer is that it depends on the angle you
have the pad set at, and what type of brake you do this to.

I'm pretty sure, from thinking about it, that the risk is very low with
a single-pivot brake. But if my theory is right, if the brake pad face
is parallel to a radius of the circle described by the brake arm as it
swings from the pivot (in other words, if you drew a line tangent to
that circle, it would be parallel to the brake post and tangent at the
pad face), there will be no change in the contact point with the rim.

If the pad was angled more steeply downward than that, it would tend to
move towards the inner edge of the rim as it wore, and if it was
shallower, the pad would indeed get closer to the sidewall as it wore.

With dual-pivot, centre-pull, or canti brakes, it's a different
calculation.

--
Ryan Cousineau, [email hidden] http://www.sfu.ca/~rcousine/wiredcola/
President, Fabrizio Mazzoleni Fan Club

a new rat tail file works gud. add fender washers to compensate for
the inner wear on the pad's arms when the old stock washer wore its
way inward reducing downward adjustment. see sheldon brown's brake mod
page. get a set of long arm shimano's and a disc brake!!!! yeaaahh!
seriously: yawl have no problem with the long dirt pads on the
centerpulls?

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

Quoted message said:

http://www.sfu.ca/~rcousine/wiredcola/archive/2004_05_23_archive.html#108
547116339302014

I've posted some pictures and notes on using V-brake hardware to extend
the reach of caliper brakes slightly. One unnoted downside: slightly
less pad life due to taking the pad down at an angle.

That bike looks like a prime candidate for my homespun "dropbolt"
idea. More like a "drophole" idea, really. I did this on a bike
designed for 26x1-3/8" wheels converted to 26x1.25" wheels.

It involves one of those sheet metal house framing widgets from a
hardware store. I think it's some kind of joist hanger designed to
straddle a 2x6 midway (as opposed to the end). I cut off the ends
leaving a "U" shaped piece if steel, about 1.5" wide, drilled so the
top of the "U" bolts into the existing hole in the fork crown. New
holes were drilled in the bottom of the "U" to accomodate the brake
bolt. It was quite stiff, and perfect size for bolting onto the
existing fork crown.

This setup allowed me to use a shorter reach side pull in place of a
very long reach BMX sidepull which could barely reach.

In article <[email hidden]>,

(papercut) said:

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

Quoted message said:

http://www.sfu.ca/~rcousine/wiredcola/archive/2004_05_23_archive.html#108
547116339302014

I've posted some pictures and notes on using V-brake hardware to extend
the reach of caliper brakes slightly. One unnoted downside: slightly
less pad life due to taking the pad down at an angle.

That bike looks like a prime candidate for my homespun "dropbolt"
idea. More like a "drophole" idea, really. I did this on a bike
designed for 26x1-3/8" wheels converted to 26x1.25" wheels.

Pictures! Pictures!

--
Ryan Cousineau, [email hidden] http://www.sfu.ca/~rcousine/wiredcola/
President, Fabrizio Mazzoleni Fan Club