Need some help chosing a new rim

Brett Jaffee

I've had my FS bike (Kona Dawg) for about 9 months, and I'm
already on my second rear wheel...a Mavic 223 disc (same
type as what came on the bike). That wheel has a dent in it
too, though.

I weigh 200lbs, and while I don't consider myself very fast,
I am evidently hard on rear wheels. That's probably not
going to change, despite my best efforts. So, I'm thinking
about going with a somewhat stronger rim, hopefully without
going overboard.

Here's the alphabet soup I'm looking at:

Mavic XM719: Apparently stronger then the 223, but its a rim
brake rim (I have discs)... not sure if that makes a diff.
This wheel replaces the older Mavic 517, btw.

Mavic XM819 disc: About the same weight (465grams) as the
719, but disc specific. However, its a UST wheel, and I
don't really want to go tubless, so I dunno if this makes
sense for me.

Mavic XM321 disc: A much heavier rim than either of the two
above (570 grams). Replaces the old Mavic F219.

Sun Rhynolite XL: Heavy duty rim, pretty much the same
weight as the XM
321.

People have told me that the 321 and the Rhynolyte would be
overkill, especially since they add so much weight. Assuming
that's the case, any thoughts on the rim brake 719 vs the
disc-specific but UST 819?

Slacker

Brett Jaffee wrote:
> I've had my FS bike (Kona Dawg) for about 9 months, and
> I'm already on my second rear wheel...a Mavic 223 disc
> (same type as what came on the bike). That wheel has a
> dent in it too, though.
>
> I weigh 200lbs, and while I don't consider myself very
> fast, I am evidently hard on rear wheels. That's probably
> not going to change, despite my best efforts. So, I'm
> thinking about going with a somewhat stronger rim,
> hopefully without going overboard.
>
> Here's the alphabet soup I'm looking at:
>
> Mavic XM719: Apparently stronger then the 223, but its a
> rim brake rim (I have discs)... not sure if that makes a
> diff. This wheel replaces the older Mavic 517, btw.
>
> Mavic XM819 disc: About the same weight (465grams) as the
> 719, but disc specific. However, its a UST wheel, and I
> don't really want to go tubless, so I dunno if this makes
> sense for me.
>
> Mavic XM321 disc: A much heavier rim than either of the
> two above (570 grams). Replaces the old Mavic F219.
>
> Sun Rhynolite XL: Heavy duty rim, pretty much the same
> weight as the XM
> 321.
>
> People have told me that the 321 and the Rhynolyte would
> be overkill, especially since they add so much weight.
> Assuming that's the case, any thoughts on the rim brake
> 719 vs the disc-specific but UST 819?

The EX 721 (old 521) is what you need. It's a great rim and
can hold up to your weight, no problem.

Forget about the weight, you need strong rim firstly.

--
Slacker

Brett Jaffee

Slacker <slacker7@sbcglobal.net> wrote in
news:2le6jpFbhunlU1@uni-berlin.de:

>
> The EX 721 (old 521) is what you need. It's a great rim
> and can hold up to your weight, no problem.

Thanks. I understand what you're saying, but by all acounts,
the 223's aren't the greatest rims. I figure I might try an
incremental jump.

>
> Forget about the weight, you need strong rim firstly.

True, but those 721's are really heavy. FWIW, I'm not
tacoing the 223's. The first went slightly out of round (I
couldn't feel it, but I kept breaking spokes), and the
second has a small dent in the side. If I was totally
destroying them, I'd think more about getting a much more
heavy duty rim.

Superslinky

Brett Jaffee said...

> I've had my FS bike (Kona Dawg) for about 9 months, and
> I'm already on my second rear wheel...a Mavic 223 disc
> (same type as what came on the bike). That wheel has a
> dent in it too, though.
>
> I weigh 200lbs, and while I don't consider myself very
> fast, I am evidently hard on rear wheels. That's probably
> not going to change, despite my best efforts. So, I'm
> thinking about going with a somewhat stronger rim,
> hopefully without going overboard.
>
> Here's the alphabet soup I'm looking at:
>
> Mavic XM719: Apparently stronger then the 223, but its a
> rim brake rim (I have discs)... not sure if that makes a
> diff. This wheel replaces the older Mavic 517, btw.

> Mavic XM819 disc: About the same weight (465grams) as the
> 719, but disc specific. However, its a UST wheel, and I
> don't really want to go tubless, so I dunno if this makes
> sense for me.

You don't have to use tubless (sic) tires on a UST rim. You
can use regular tub(e)s and ordinary tires if you want. The
weight given by Mavic apparently doesn't include the huge
threaded eyelets that you need for the 'fore' design.

> Mavic XM321 disc: A much heavier rim than either of the
> two above (570 grams). Replaces the old Mavic F219.

Dude, you weigh 200lbs and you are worried about 3oz extra
weight? Time for a reality check. I would be a lot more
worried about keeping rims on the bike. I think this one is
the logical choice.

> Sun Rhynolite XL: Heavy duty rim, pretty much the same
> weight as the XM
> 321.

A wide downhill rim. Be aware that wide rims will require
wide tires, so you may not be able to use anything less than
a 2.1. That is the case for the EX series Mavic rims that
Slacker recommended. Actually, you may be able to use
somewhat narrower tires, but it would be outside
manufacturer specs. The regular Rhyno Lite is the same but
narrower and would be a more versatile choice.

> People have told me that the 321 and the Rhynolyte would
> be overkill, especially since they add so much weight.
> Assuming that's the case, any thoughts on the rim brake
> 719 vs the disc-specific but UST 819?

Those people are full of doo-doo. You need a rim that will
support your weight and riding style.

Brett Jaffee

SuperSlinky <nospam@least.com> wrote in
news:MPG.1b5bbf53e830bddf989895@netnews.comcast.net:

> You don't have to use tubless (sic) tires on a UST rim.
> You can use regular tub(e)s and ordinary tires if you
> want. The weight given by Mavic apparently doesn't
> include the huge threaded eyelets that you need for the
> 'fore' design.

Sorry, what's the "fore" design?

> Dude, you weigh 200lbs and you are worried about 3oz extra
> weight? Time for a reality check. I would be a lot more
> worried about keeping rims on the bike. I think this one
> is the logical choice.

Heh, no...3oz by itself wouldnt worry me (comparing the
Rhyno/321 with the
721), but the Rhynos are already nearly a 1/2 pound heavier
then the other choices. My understanding is that it's
going to be weight added to the bike in the worst
possible place. Adding 1/2 pound wouldn't worry me too
much anywhere else on the bike except the wheels.

>
>> Sun Rhynolite XL: Heavy duty rim, pretty much the same
>> weight as the XM 321.
>
> A wide downhill rim. Be aware that wide rims will require
> wide tires, so you may not be able to use anything less
> than a 2.1.

That's cool. I typically use Panaracer Fire 2.1's anyway.

Superslinky

Brett Jaffee said...

> Sorry, what's the "fore" design?

The spoke holes are drilled only through the rim wall
facing the hub leaving the inner wall without holes and
airtight for tubeless tires. The spoke nipples are then
installed from the top using a threaded eyelet instead of
from the bottom.

> Heh, no...3oz by itself wouldnt worry me (comparing the
> Rhyno/321 with the
> 721), but the Rhynos are already nearly a 1/2 pound
> heavier then the other choices. My understanding is
> that it's going to be weight added to the bike in the
> worst possible place. Adding 1/2 pound wouldn't worry
> me too much anywhere else on the bike except the
> wheels.

I guess I just don't understand the worry about weight since
the Dawg is a heavy bike with lots of heavy components. And
with you being 200lbs, it isn't something that you will
notice. You could make up that 7oz a dozen ways, probably
just by switching to lighter tires. Rolling weight isn't
infinitely more important than any other weight, maybe it is
worth twice as much, but no more. Losing one pound from the
engine (that's you) would be more valuable. Aside from all
that, you evidently need a sturdy rim. Them's the breaks. If
I had just trashed two rims, I would stop wasting time and
money and get something that works. Disc specific rims are
stronger than the rim brake counterparts. The lightest rim
in your list isn't a disc rim, therefore it will be the
weakest. Pay your money and take your chances I guess.