[RBW] Discs versus calipers

[Jesse]

I've heard a handful of folks on either the iBOB or 650b groups say their Riv 
forks are too stout for their liking. Makes me wonder how much compliance a 
full blown low trail Jeff Lyon fork or somesuch has compared to the average Riv.

No experience w/ disc, but I'm guessing running fat tires tubeless @ low PSI 
compensates a bit for the overbuilt nature of disc forks.

I remember Matt Chester talking about why he preferred rim brakes.. something 
to the effect of disc use stressing the frame. Pretty sure Grant mentions this 
issue as well. Have always wondered if this is just a convenient data point for 
folks in the rim brake camp, or if it's a serious thing that would cause frame 
issues down the road.

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[RBW] Discs versus calipers

[Patrick Moore]

I'm putting this in a new thread, because I have some questions. Note: I'm
not disagreeing, I'm asking because I want to know more.

Clayton said, in the Rivs On Block thread:

*- More margin betw. rim and brake to adjust for rub. Disc brakes usually
have much tighter clearances and make it a much more fiddly affair to get
rid of rub (applies mostly to hydros)*
*- Typically lighter weight*
*[...]*
*- Pads tend to last longer*

#1: I agree that this is very true for mechanical discs, but for
hydraulics? I thought that pads for hydraulics allowed more gap than those
for mechanicals, at least once-sided-pull mechanicals. For me, this isn't
merely academic; it may influence my choice of mechanicals over hydraulics
one day.

#2: Yes, calipers are lighter, but then disc-specific rims can be much
lighter than rim brake rims, at least in the wider sizes.

#3: I've read that this is true; I've also read the opposite (recently, in
a review of some disc setup -- Bike Radar? Which one is true?

I do know that my Kool Stop salmons seem to last years if not decades.

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