Mavic Rando M4 Rims?

[The Ken]

Does anyone know anything about Mavic Rando M4 Rims? I've just bought one cause it looks like a 231CD but I don't know how good they are or even if they are designed for cantis or disc (the brake surface isn't totally flat or it is narrow)

 

[The Ken]

photo update - I think it is a different profile to 231's I think it might be missing the round part of the cross section but the logo looks like it is from the same era....

 

[cchris2lou]

they look like road rims .

 

[The Ken]

Hi chris, how can you tell, is it the "650"?
They are 26inch and pretty much the same dimensions as 231's - I thought it might be a cheaper ceramic rim.

 

[The Ken]

could be a ceramic update of the Module 4 Tandem offroad rim?

http://www.bikepro.com/products/rims/mavicroad.shtml

 

[cchris2lou]

the logo design is more like a road rim .

 

[one-eyed_jim]

http://www.mombat.org/Mavic.htm

They were early Mavic XC rims. I think Ken's right that the extrusion is the same as the 700c Mod 4 rim, with a CD (not ceramic) finish.

 

[The Ken]

thanks 4 the link jim - means I can build a usable wheel with this - cost me a £5

I thought the the CD was the "ceramic" coating - it was just referred to as hard anodised in the states (beacuse thats what it actually is) and on the lable I didn't think "ceramic" lables were used until later on.

 

[one-eyed_jim]

I thought the the CD was the "ceramic" coating - it was just referred to as hard anodised in the states (beacuse thats what it actually is) and on the lable I didn't think "ceramic" lables were used until later on.

Mavic's ceramic treatment and CD finish are two different things. CD (couche dure) is a smooth, dark, shiny hard anodized coating all over the rim surface. The ceramic treatment is a thick, rough, dull treatment applied to the braking surfaces only.

http://www.bikepro.com/products/rims/mavic_mtn.html

The area where brake pads contact this rim has a ceramic coating. Mavic uses a flame spray at high temperature to apply an aluminum and titanium oxide mixture. The ceramic powders are applied using a gun with an air-acetylene flame. The ceramic powders are carried in a stream of air toward the flame, through a central nozzle, within the head of the gun. As the ceramic powders contacts the flame, it becomes molten and is projected onto the rim's prepared sidewall surface.

The ceramic coating treatment improves the sidewall's friction with the brake pad because of its finely raised abrasive surface.