Magnesium pedals

No they;re wekaer, and they tend to break easily, their only advantage
is that they're a fair bit lighter. I wouldn't use them for Muni where
dropping them on rocks can break them, for freestyle or distance they
might be ok. Sealed bearings means your pedals will last much longer
and are usually re-buildable so can be cleaned out and re-greased
repeatedly for longer life and a smoother ride.

--
kington99

Dave

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I have magnesium pedals and I suspect what kington said is true. There
is one big advantage that I find and that is that if you have good form
in your grinds, I find that magnesium slides better than alloy.

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ntappin
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I've had Haro Big Block magnesium pedals on my trials uni for almost a
year and a half now, and the only thing that's happened to them is the
spindle is starting to get bent. Overall they've held up great,
although I haven't done a whole lot of grinding/pedal grabs without a
grindplate on.

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kington99 said:

Sealed bearings means your pedals will last much longer and are usually
re-buildable so can be cleaned out and re-greased repeatedly

Sealed bearings "means" it's harder for dirt and moisture to get into
the bearings. Unsealed bearings are easier to rebuild since you don't
have to pry open the seal before you do the work. If you're on top of
your maintenance, you can get performance from unsealed bearings
comparable to that of sealed bearings. The only gotcha is that you
can't easily replace the raceway in a set of unsealed pedals.

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maestro8

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maestro8 said:

Sealed bearings "means" it's harder for dirt and moisture to get into
the bearings. Unsealed bearings are easier to rebuild since you don't
have to pry open the seal before you do the work. If you're on top of
your maintenance, you can get performance from unsealed bearings
comparable to that of sealed bearings.

"Being on top of your maintenance" of unsealed pedals would have meant,
for me, rebuilding the pedals about once every two weeks for the past
four months. No thanks.

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No prying involved with my sealed pedals (DMR V12s) they come apart
beautifully and both the roller bearing at the outer end and the plain
bearing at the inner end can be easily replaced. I do my Muni pedals
every 3 months or so and they're lasting great.

--
kington99

Dave

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tholub said:

"Being on top of your maintenance" of unsealed pedals would have meant,
for me, rebuilding the pedals about once every two weeks for the past
four months. No thanks.

What, afraid of a little mud? What kind of pedals do you have? I've
been thrashing my unsealed Odyssey JCs, taking 'em on the beach,
through the rain and mud, etc. and just hosing 'em off when they get
too crusty. They're still performing just as well as my sealed JCs,
two years and two rebuilds later.

kington99 said:

No prying involved with my sealed pedals ... plain bearing at the inner
end can be easily replaced

There's a difference between maintenance and replacement. Maintenance
involves a little cleaning fluid and some fresh grease. Replacement
involves buying new bearings.

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maestro8 said:

What, afraid of a little mud? What kind of pedals do you have? I've
been thrashing my unsealed Odyssey JCs, taking 'em on the beach,
through the rain and mud, etc. and just hosing 'em off when they get
too crusty. They're still performing just as well as my sealed JCs,
two years and two rebuilds later.

Look, sealed-bearing pedals are less likely to get gunk in them and
need maintenance than non-sealed-bearing pedals; it's really that
simple. If you really care about your bearings, you should never hose
down anything which has non-sealed bearings, because you can drive the
gunk deeper into the bearing races. It doesn't matter all that much,
as our bearings aren't very high-performance anyway, but if I have to
choose more maintenance or less maintenance, I know which way I'll go.

--
tholub
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so are you guys saying non sealed bearings require no maintenance and
sealed ones do? and how often are you suspose to do maintenance
on the pedals? do you think with the price difference sealed
bearings will be worth it?

--
maflitto
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maflitto said:

so are you guys saying non sealed bearings require no maintenance and
sealed ones do? and how often are you suspose to do maintenance
on the pedals? do you think with the price difference sealed
bearings will be worth it?

Sealed bearing pedals require very little maintenance; occasionally
making sure they're tight. Pedals without sealed bearings require
maintenance if you want them to last; any time they get particularly
wet, muddy, or sandy, you really should take them apart, degrease the
bearing races, relube and reinstall the bearings.

In practice, that doesn't happen, so non-sealed-bearing pedals don't
last as long as sealed-bearing pedals do. The price difference is
usually minimal, and definitely worth it.

--
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maestro8 said:

There's a difference between maintenance and replacement. Maintenance
involves a little cleaning fluid and some fresh grease. Replacement
involves buying new bearings.

Well obviously, but if you can easily strip a pedal far enough to be
able to replace components then obviously you could easily dismantle it
far enough to clean it. Did you really think i was saying i change all
the bearings every three months?

--
kington99

Dave

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tholub said:

Look, sealed-bearing pedals are less likely to get gunk in them and need
maintenance than non-sealed-bearing pedals; it's really that simple.

Look, with a good pedal design, there isn't a huge difference between
these two classes of pedals. The bearings on my non-sealed pedals
aren't just hangin' out in the wind, they're enclosed in a casing. The
casing is sealed by a threaded cap. The sealed bearing pedals just
have a second seal in 'em. Belt vs. belt-and-suspenders. It's really
that simple. (WTF?)

tholub said:

you should never hose down anything which has non-sealed bearings,
because you can drive the gunk deeper into the bearing races.

Last time I checked, the bearing races aren't more than a channel in
metal. How do you drive something deeper into the racing? If
anything, gunk in the races just moves around, if I happen to get water
in 'em. I hose things off so there's less surface grime that could
work its way into the races.

kington99 said:

Well obviously, but if you can easily strip a pedal far enough to be
able to replace components then obviously you could easily dismantle it
far enough to clean it.

Your logic has a flaw when talking about sealed bearing maintenance.
You don't have to open the seals to replace sealed bearings, but you do
have to open the seals if you want to maintain sealed bearings.

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maestro8 said:

Last time I checked, the bearing races aren't more than a channel in
metal. How do you drive something deeper into the racing? If
anything, gunk in the races just moves around, if I happen to get water
in 'em. I hose things off so there's less surface grime that could
work its way into the races.

The point is, if you hit your pedals with a hose, the water can push
stuff that's sitting around the edge of the dust cap deeper into the
pedals, and the water can get in there itself. Either of those things
is bad news for your bearings.

--
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maestro8 said:

Your logic has a flaw when talking about sealed bearing maintenance.
You don't have to open the seals to replace sealed bearings, but you do
have to open the seals if you want to maintain sealed bearings.

Ah now i see where we're misunderstanding each other. The seals i'm
talking about are the rubber o-rings etc. on each end of the shaft
between it and the pedal body which keep [censored] from entering the area
where the bearings bear on the shaft. You're talking about the seals
built in to the bearing itself to hold grease in around the balls.
Because V12s have seals on the shaft but not on the bearing itself you
can get in easily to grease them but they're still sealed well, best of
both worlds.

--
kington99

Dave

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I was told that they would break more easily, especially when you do
pedal-grabs or crank-hangs, BUT I did a lot of pedal-grabs and
crank-hangs, some of them REALLY brutal and hard but they didn't break
yet.

Some of the pins broke, but the pedals didn't braek

--
Bertl

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