Mavic Rim ID

[adamdom]

Im trying to ID these Mavic SUP rims so i can get some decals made up. Any ideas please
i can get some replacement decals.

 

[Roasted]

Look like D521s

 

[sam_white]

What's the internal width? That ought to be enough combined with the photo.

 

[adamdom]

Ok I will measure tomorrow when I get home

 

[bikeworkshop]

Was the 721 the same dimensions as the 521, but a difference in heat treatment?
21 being rim width mm
5/7 being quality iirc.

I think they both had welded joins and SUP, and were available in CD finish, so telling them apart would probably need accurate weights.

I don't think Weightweenies posters used these rims though