hub flange spacing and dish
Nicholas Grieco
current hubs to one another. I was surprised to find sizeable differences
in both hub flange width, and offset on the axle, according to their
specifications.
Below, I've listed the dimensions of each hub from their website, for the
sake of discussion. Which of these do you think achieves the best
compromise between maximizing flange width, and minimizing dish? (This is
independent of other hub differentiations of course, like axle length,
bearing type, engagement mechanism, etc.)
Regards,
Nicholas
Dura-Ace 7800
20.55 center to flange- right
36.35 center to flange- left
56.9 flange width
7.9 offset
N/A spoke hole circle
Dura-Ace 7700
21.1 center to flange- right
36.9 center to flange- left
58.0 flange width
7.9 offset
44.0 spoke hole circle
Ultegra 6500
20.5 center to flange- right
32.5 center to flange- left
53.0 flange width
6.0 offset
45.0 spoke hole circle
XTR M950
23.2 center to flange- right
26.8 center to flange- left
50.0 flange width
1.8 offset
45.0 spoke hole circle
Deore XT M760
21.75 center to flange- right
37.55 center to flange- left
59.3 flange width
7.9 offset
45.0 spoke hole circle
Deore LX M570
23.2 center to flange- right
36.8 center to flange- left
60.0 flange width
6.8 offset
45.0 spoke hole circle
Deore LX R080
22.7 center to flange- right
37.9 center to flange- left
60.6 flange width
7.6 offset
45.0 spoke hole circle
Deore M510
23.2 center to flange- right
18.55 center to flange- left
41.75 flange width
2.325 offset
45.0 spoke hole circle
daveornee
If the above specifications are true in real life products, then the
XTR M950 will best meet your combined goals.
However, I am sure that at the very least, two of the numbers for the
Deore M510 are incorrect on the Shimano site. (Flange width, center to
flange - left, and offset are all incorrectly listed) I wouldn't trust
all the numbers listed on the Shimano site as accurate and trustworthy
for selection of product. Certainly, some of their numbers, like spoke
hole circles are correct.
--
daveornee
Nicholas Grieco
> > Thinking about dish and wheel strength, I started comparing
> > Shimano's current hubs to one another. I was surprised to find
> > sizeable differences in both hub flange width, and offset on the
> > axle, according to their specifications.
> >
> > Below, I've listed the dimensions of each hub from their website,
> > for the sake of discussion. Which of these do you think achieves
> > mizing dish? (This is independent of other hub differentiations of
> > course, like axle length, bearing type, engagement mechanism, etc.)
[hub dimensions snipped]
daveornee wrote:
> If the above specifications are true in real life products, then the
> XTR M950 will best meet your combined goals.
So you're thinking that improved l-r spoke tension balance is more
important than the relative narrowness of the flange spacing. The M950
is 3mm narrow than the 6500, and 8mm (!) narrower than the 7700.
> However, I am sure that at the very least, two of the numbers for the
> Deore M510 are incorrect on the Shimano site. (Flange width, center to
> flange - left, and offset are all incorrectly listed)
Yeah, that doesn't make much sense, does it! Thanks for catching that.
daveornee
Well, as I stated from one example, Shimano's site doesn't list correct
dimensions. I have built and currently ride and own XTR M950 and DURA
ACE FH-7700 wheels. The side to side spoke tension balance is
important. The spoke support angle is also important. I can't compare
apples to apples on the wheels I have because I used an offset spoke bed
wheel for the XTR-M950 rear. It has exactly the same spoke tension on
every spoke.
I can compare the hubs and tell you that they don't match Shimano's
listed specifications. I can't get the calipers in to make exact
measurements, but, by eyeballing them, I would say that the XTR M-950
hub flanges are wider spaced than DURA ACE by a mm or two and they are
also a slight larger amount wider spaced than Ultegra.
All this amounts to is spoke support angle and spoke load sharing. A
well built wheel with no dish and adequate spoke support angle will be
the most reliable.
--
daveornee
Trevor Jeffrey
Nicholas Grieco wrote in message ...
>Thinking about dish and wheel strength, I started comparing Shimano's
>current hubs to one another. I was surprised to find sizeable differences
>in both hub flange width, and offset on the axle, according to their
>specifications.
>
>Below, I've listed the dimensions of each hub from their website, for the
>sake of discussion. Which of these do you think achieves the best
>compromise between maximizing flange width, and minimizing dish? (This is
>independent of other hub differentiations of course, like axle length,
>bearing type, engagement mechanism, etc.)
>
It is the centre to flange dimension is the most important, lateral bracing
is most effective when this is greater.
Trevor
dianne_1234
<trevor_...@beeb.net> wrote:
>It is the centre to flange dimension is the most important, lateral bracing
>is most effective when this is greater.
>
>Trevor
...as long as the spokes are tight enough to "never" go slack?
Nicholas Grieco
> > > However, I am sure that at the very least, two of the numbers for
> > > the Deore M510 are incorrect on the Shimano site. (Flange width,
> > > center to flange - left, and offset are all incorrectly listed)
> > > I wouldn't trust all the numbers listed on the Shimano site as
> > > accurate and trustworthy for selection of product. Certainly, some
> > > of their numbers, like spoke hole circles are correct.
and continues:
> Well, as I stated from one example, Shimano's site doesn't list correct
> dimensions. I have built and currently ride and own XTR M950 and
> DURA ACE FH-7700 wheels. The side to side spoke tension balance
> is important. The spoke support angle is also important. I can't com-
> pare apples to apples on the wheels I have because I used an offset
> spoke bed wheel for the XTR-M950 rear. It has exactly the same
> spoke tension on every spoke.
>
> I can compare the hubs and tell you that they don't match Shimano's
> listed specifications. I can't get the calipers in to make exact measure-
> ments, but, by eyeballing them, I would say that the XTR M-950 hub
> flanges are wider spaced than DURA ACE by a mm or two and they
> are also a slight larger amount wider spaced than Ultegra.
If the published dimensions are suspect, I'll see if I can get the actual
dimensions this week and get back to the group.
Trevor Jeffrey
dianne_1234 wrote in message ...
Impossible to attain in a correctly built wheel. Not to go slack during
normal service conditions is the correct description.
Trevor