Velocity AeroheadOC spoke length calculation?

[[email protected]]

This question is for Peter C, or anyone else with experience building
wheels with OC rims.

My question is, do I have to make an adjustment in the calculated spoke
length to account for the off-set of the rim?

After building dozens of wheels, I am planning my first wheel build
with an OC. I'm using a King Classic Hub, 3x pattern, and 12mm brass
nipples. The DT Swiss spoke calulator calls for 289mm right side, and
292mm left side spokes. Should I use these lengths, or do I need to
make some kind of adjustment?

Also, I'm planning to tension the spokes 100Kgf right side and about
80-90Kgf left side. Would that be correct?

Finally, excuse this question, but toward which side does the rim
off-set go? I assume the non-drive side. But I haven't seen one of
these wheels built and I hate to assume.

(Forgive me if this post appears twice. My PC crashed the first time I
tried to to post this question.)

 

[dvt]

[email protected] wrote:
> My question is, do I have to make an adjustment in the calculated spoke
> length to account for the off-set of the rim?

Yes.

> After building dozens of wheels, I am planning my first wheel build with
> an OC. I'm using a King Classic Hub, 3x pattern, and 12mm brass nipples.
> The DT Swiss spoke calulator calls for 289mm right side, and
> 292mm left side spokes. Should I use these lengths, or do I need to make
> some kind of adjustment?

You *do* need to make an adjustment. I don't have a spoke calculator handy,
so I can't check your numbers. When I used the Aerohead OC with Shimano
hubs, I used equal length spokes on each side.

You could adjust the calculator if you know the offset of the rim. The
right flange is further from the center line by half the rim offset, the
left flange is opposite.

> Also, I'm planning to tension the spokes
> 100Kgf right side and about
> 80-90Kgf left side. Would that be correct?

Check both sides, and make the tighter side (probably the right side) as
tight as Velocity recommends. Let the other side fall where it may.

> Finally, excuse this question, but toward which side does the rim off-
> set go? I assume the non-drive side. But I haven't seen one of these
> wheels built and I hate to assume.

The spoke holes should be away from the chain as far as possible.

> (Forgive me if this post appears twice. My PC crashed the first time I
> tried to to post this question.)

How about three times?

--
Dave
dvt at psu dot edu
=== Posted with Qusnetsoft NewsReader 3.1 Unregistered

 

[dvt]

[email protected] wrote:
> My question is, do I have to make an adjustment in the calculated spoke
> length to account for the off-set of the rim?

Yes.

> After building dozens of wheels, I am planning my first wheel build with
> an OC. I'm using a King Classic Hub, 3x pattern, and 12mm brass nipples.
> The DT Swiss spoke calulator calls for 289mm right side, and
> 292mm left side spokes. Should I use these lengths, or do I need to make
> some kind of adjustment?

You *do* need to make an adjustment. I don't have a spoke calculator handy,
so I can't check your numbers. When I used the Aerohead OC with Shimano
hubs, I used equal length spokes on each side.

You could adjust the calculator if you know the offset of the rim. The
right flange is further from the center line by half the rim offset, the
left flange is opposite.

> Also, I'm planning to tension the spokes
> 100Kgf right side and about
> 80-90Kgf left side. Would that be correct?

Check both sides, and make the tighter side (probably the right side) as
tight as Velocity recommends. Let the other side fall where it may.

> Finally, excuse this question, but toward which side does the rim off-
> set go? I assume the non-drive side. But I haven't seen one of these
> wheels built and I hate to assume.

The spoke holes should be away from the chain as far as possible.

> (Forgive me if this post appears twice. My PC crashed the first time I
> tried to to post this question.)

How about three times?

--
Dave
dvt at psu dot edu
=== Posted with Qusnetsoft NewsReader 3.1 Unregistered

 

[dvt]

dvt <[email protected]> wrote:

> [email protected] wrote:

>> After building dozens of wheels, I am planning my first wheel build
>> with an OC. I'm using a King Classic Hub, 3x pattern, and 12mm brass
>> nipples. The DT Swiss spoke calulator calls for
>> 289mm right side, and
>> 292mm left side spokes. Should I use these lengths, or do I need to
>> make some kind of adjustment?

> You could adjust the calculator if you know the offset of the rim. The
> right flange is further from the center line by half the rim offset, the
> left flange is opposite.

Oops. Not half the offset, all of the offset. Don't even ask what I was
thinking.

>> (Forgive me if this post appears twice. My PC crashed the first time I
>> tried to to post this question.)

> How about three times?

Even funnier is my double post. I'm trying a new newsreader.

--
dvt <[email protected]>
Sat, 11 Dec 2004 22:47:51 -0400

=== Posted with Qusnetsoft NewsReader 3.1 Unregistered

 

[Qui si parla Campagnolo]

jim-<< My question is, do I have to make an adjustment in the calculated spoke
length to account for the off-set of the rim? >><BR><BR>

I say-what I do is calculate the right side then add 1mm for the left, instead
of 2mm for non OC rims.

290/291 is what i would use,

Peter Chisholm
Vecchio's Bicicletteria
1833 Pearl St.
Boulder, CO, 80302
(303)440-3535
http://www.vecchios.com
"Ruote convenzionali costruite eccezionalmente bene"