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 <rcousine-
[email hidden]>, Ryan Cousineau

Quoted message 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]
sfu.cawiredcolaOpen ↗ 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:

sfu.ca2004 05 23Open ↗
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:<rcousine-
[email hidden]>...

Quoted message said:

sfu.ca2004 05 2Open ↗
3_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]
sfu.cawiredcolaOpen ↗ President, Fabrizio
Mazzoleni Fan Club