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Dia Compe AC500

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Dia Compe AC500

Old 01-23-16, 02:10 PM
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scale
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Dia Compe AC500

I have a set of these brakes. They have a strange extra long arm that goes up and almost centers even though it is a side pull brake. Is this the answer to replacing a center pull older style brake with a side pull? They look a bit strange. All side pulls i have never had, the arm is on the side for sure. Id have to imagine the bike im staring at used to have center pull diacompes and these were replaced with the AC500 at some point.
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Old 01-23-16, 02:25 PM
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T-Mar
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It was an attempt to provide a more aerodynamic side pull brake. The 'A' in the model designation stands for "aero".
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Old 01-23-16, 02:57 PM
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scale
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Originally Posted by T-Mar View Post
It was an attempt to provide a more aerodynamic side pull brake. The 'A' in the model designation stands for "aero".
Thank you again sir. Weird. I cant imagine wind drag on your brakes is huge. Im going to continue to run them. They appear to be in great shape and work well. I will likely swap pads over to some Kool Stops.
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Old 01-23-16, 04:54 PM
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Originally Posted by scale View Post
I cant imagine wind drag on your brakes is huge. Im going to continue to run them. They appear to be in great shape and work well. I will likely swap pads over to some Kool Stops.
You're right, it's not a great deal of drag, but there was a period of time in the early 80s when "aero" was all the rage and everything had to be styled to fit that expectation. Yours are the budget version; there was a high-end version called the "Aero Gran Compe" as well:

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