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Diamond pattern on rim on Rigida Superchromix

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Diamond pattern on rim on Rigida Superchromix

Old 05-30-17, 10:20 AM
  #1  
El Gato27
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Diamond pattern on rim on Rigida Superchromix

Have a pair of Rigida Superchromix wheels that I recently took off an old Kalkhoff bike. Was wondering if there is a specific term for the diamond pattern on the rim?
Thank you.
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Old 05-30-17, 10:49 AM
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Hello,
I don't know the proper term, and know you did not ask but....Those hatch marks were put there to provide extra stopping in wet weather.
A little outdated and not very good stopping power in the rain or damp conditions....if only riding on warm dry days
O.K. but anything else be careful. Chrome and water, not your friends for stopping.
Regards, Ben
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Old 05-30-17, 11:07 AM
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Dimpled? Cross-hatched? Not very smooth? Kinda bumpy?

Not very helpful?
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Old 05-30-17, 11:17 AM
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I call them "textured." Who knows if it's right.
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Old 05-30-17, 11:18 AM
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At least they make a create a cool "whhhrrrzzzz" sound when you stop?
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Old 05-30-17, 11:28 AM
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"Knurled" is the term I've seen...

https://en.wikipedia.org/wiki/Knurling
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Old 05-30-17, 11:56 AM
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Originally Posted by Mechanicjay View Post
At least they make a create a cool "whhhrrrzzzz" sound when you stop?
Gosh do they ever!
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Old 05-30-17, 12:11 PM
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Originally Posted by Mechanicjay View Post
At least they make a create a cool "whhhrrrzzzz" sound when you try to stop?
Fixed that for ya.
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Old 05-30-17, 12:14 PM
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they are called "ineffective"
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Old 05-30-17, 12:15 PM
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-----

The general term I have always heard is "serrated."

-----
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Old 05-30-17, 12:39 PM
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Stippled?
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Old 05-30-17, 12:43 PM
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@clubman wins - Dimpled
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Old 05-30-17, 01:02 PM
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Maybe they should be called "siping", as what tire tread grooves are called, to drain water away to avoid aquaplaning......
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Old 05-30-17, 04:23 PM
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Originally Posted by SJX426 View Post
@clubman wins - Dimpled
Beg to differ. @SJX426 wins: "ineffective."
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Old 05-30-17, 04:53 PM
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Originally Posted by El Gato27 View Post
Have a pair of Rigida Superchromix wheels that I recently took off an old Kalkhoff bike. Was wondering if there is a specific term for the diamond pattern on the rim?
Thank you.
Beautiful
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Old 05-30-17, 05:09 PM
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I call it "knurled."

I have a set of alloy Super Champion Model 58s that have a knurled braking surface.

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Old 05-30-17, 05:37 PM
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Knurled, yes. Mavics too
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Old 05-30-17, 05:58 PM
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Originally Posted by Mechanicjay View Post
At least they make a create a cool "whhhrrrzzzz" sound when you stop?
I havent heard that since 1973.
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Old 05-30-17, 06:08 PM
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Originally Posted by OldsCOOL View Post
I havent heard that since 1973.
I'm happy to make a recording for you as I come down the hill from my house in morning. If it's chilly enough out, you can get some really great resonant ringing out of the rims too!
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Old 05-30-17, 09:59 PM
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I would call them "terrifying", especially in the wet. While "designed" to improve braking in wet weather, the dimples (or whatever) effectively held water, paying it out and increasing stopping distances over plain-sided chromed rims. Neither were any fun!
Cheers!
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Old 05-31-17, 09:22 AM
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And remember the Weinmann brake pads with the X pattern, ostensible also to let water out? I don't think they helped, either.
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Old 05-31-17, 11:29 AM
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From an automotive application, knurling is a process the deforms the material to raise the effective surface. It is often used on used pistons skirts to reduce piston slap when rebuilding an engine.

The surface of the braking surface is not raised as a knurling process results.

The dimpling may be a result of an embossing process but "dimpled surface" is an engineering term for the resulting surface.
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