ERD of Mavic Open Pro and Sport Rims?

[Larry Dickman]

What's the ERD of the Mavic Open Pro rim, and also, what is the ERD of
the Open Sport rim? Thanks.

 

[Art Harris]

Larry Dickman wrote:
> What's the ERD of the Mavic Open Pro rim, and also, what is the ERD of
> the Open Sport rim?

According to a post by Peter Chisolm:

Open Pro 605 mm, Open Sport 608 mm.

Art Harris

 

[datakoll]

A.Muzi has a suggestion. Braze two welding rods together end to end
then add a stop on one end.
That would give outside eyelet/rim to ditto

 

[Bruce Gilbert]

"datakoll" <[email protected]> wrote in message
news:2e045fff-6ce7-4d9f-bc47-6a0fe7f1a83c@d62g2000hsf.googlegroups.com...
>
>
> A.Muzi has a suggestion. Braze two welding rods together end to end
> then add a stop on one end.
> That would give outside eyelet/rim to ditto

We have always used threaded rod and fiber nuts. It is infinitely adjustable
and accurate.

Bruce

 

[Art Harris]

datakoll wrote:
> A.Muzi has a suggestion. Braze two welding rods together end to end
> then add a stop on one end.
> That would give outside eyelet/rim to ditto
>

That doesn't help if you don't have the rim yet. He's looking for a
rim with an ERD similar to what he has now so he can use the same
spokes.

Art Harris

 

[Larry Dickman]

In article
<36c12d7b-599b-4fdc-ac67-6d18b4fc96db@p73g2000hsd.googlegroups.com>,
Art Harris <[email protected]> wrote:

> datakoll wrote:
> > A.Muzi has a suggestion. Braze two welding rods together end to end
> > then add a stop on one end.
> > That would give outside eyelet/rim to ditto
> >
>
> That doesn't help if you don't have the rim yet. He's looking for a
> rim with an ERD similar to what he has now so he can use the same
> spokes.
>
> Art Harris

Yes, that is correct. I'm thinking of swapping out a creaking Open Pro
rim with an Open Sport if the spoke lengths are about the same.

I also want to determine the replacement spoke length for my Open Pros
without having to remove spokes and measuring.

 

[[email protected]]

Larry Dickman wrote:

>>> A.Muzi has a suggestion. Braze two welding rods together end to
>>> end then add a stop on one end. That would give outside
>>> eyelet/rim to ditto

>> That doesn't help if you don't have the rim yet. He's looking for
>> a rim with an ERD similar to what he has now so he can use the same
>> spokes.

> Yes, that is correct. I'm thinking of swapping out a creaking Open
> Pro rim with an Open Sport if the spoke lengths are about the same.

> I also want to determine the replacement spoke length for my Open
> Pros without having to remove spokes and measuring.

With rim in hand, I see no difficulty measuring the OD of the rim and
then measuring from that OD down to the top of a spoke nipple and
subtracting that value twice from the OD. That is the ERD [Effective
Rim Diameter] for calculating spoke lengths.

Jobst Brandt

 

[A Muzi]

> "datakoll" <[email protected]> wrote:
>> A.Muzi has a suggestion. Braze two welding rods together end to end
>> then add a stop on one end.
>> That would give outside eyelet/rim to ditto

[email protected] wrote:
> We have always used threaded rod and fiber nuts. It is infinitely adjustable
> and accurate.

That's another good method.
Just about any measurement is better than an opinion.
--
Andrew Muzi
www.yellowjersey.org
Open every day since 1 April, 1971