On 04/04/2016 12:27 PM, Lungimsam wrote:
1.Which are better for use with fork braze ons and why? For recreational road
riding.
2. Is either just fine? I'm guessing it is but the more online stuff I read,
the more overthinking results.
Funny how before I started online bike reading everything about my bikes was
just fine.
And in fact in many ways the correct answer is they are both just fine.
But, in some cases, you could make an argument that one or the other is
superior. For example:
- Cantilever bosses are all pretty much the same and in pretty much the
same place, so you could switch brands of brakes if you wanted to,
whereas with centerpulls the brazed-on bosses are different from one
brand to another and their position is different, so you're committed
for live to a particular brake. Some would see that as an advantage to
cantis. The standard pivot location also means there's a wider
availability of off-the-shelf front racks, which maybe can save money.
- Some people find cantilever brakes to be difficult to impossible to
adjust correctly. Now the fact is, "impossible" is an outright lie:
there are some skilled bike mechanics (Cycles Ed, who you might have
seen at the Peanut Tour or at Bike Virginia is fantastic) who can adjust
them just fine, but there are many local bike shop mechanics who simply
can't deal with them. By contrast, centerpulls are very easy to adjust.
- Centerpull braze on bosses are located higher up on the fork blades
and seat stays, where the tubes are stiffer and more resistant to
bending forces than cantilevers. This means that in those
edge-and-close-to-it cases where fork blade twist under hard braking
induces brake shudder centerpulls win. It also means you can use less
stiff fork blades and seat stays with brazed on centerpulls, which
(provided they're sufficient) is also a win. Some have argued that this
also means centerpulls will always work better under very hard braking.
- Cantilever brakes can open wider, allowing a wider tire to pass
through than centerpulls. In some cases, that can be an advantage.
- Centerpulls can suffer from cosine error - where a worn pad swings up
past the rim brake track and contacts the tire. It doesn't take a
second for the brake pad to eat through the sidewall and cause a
blowout. Cantilever brakes can do the opposite, and swing down past the
bottom edge of the rim and fall into the spokes. At best this results
in no braking at all; at worst it can destroy the wheel. Hard call to
determine which is more frequent and which failure mode is worse.
- There may be cost differences. The nicest currently available new
centerpull brakes (i.e., the Paul Racer and the Compass) are not cheap.
For some that may matter a great deal, although if we're talking about
custom frames that cost difference probably won't amount to much of the
total cost of the bike.
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