THE clubhouse of the Dirty Ryderz, a Brooklyn-based motorcycle club with 63 local members (plus 27 in Virginia), is in a featureless brick building in East Flatbush with a security gate out front and tall, colorful trophies lying flat along a wall in the basement. Winter weather is not motorcycle weather, so no cycles were to be seen outside last week. But on Wednesday evening, the clubhouse buzzed with activity.

It was nearing time for a meeting of the Concerned Citizens for Motorcycle Safety, an umbrella organization for several local clubs that has had its hands full lately fighting a proposed city law aimed at controlling cycles’ noise. In particular, members were preparing for a third City Council hearing on the bill, to be held in the next few weeks, and for the international motorcycle show at the Jacob K. Javits Convention Center this weekend.

The bill, which was the subject of two Council committee hearings late last year but was delayed for further study after motorcyclists and their supporters raised objections, is intended to curb common modifications to the exhaust pipes that make cycles noisier.

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On new motorcycles, exhaust pipes bear a stamp from the manufacturer certifying that they meet state and federal laws limiting noise to 80 decibels, comparable to the level of a vacuum cleaner or an alarm clock. The law, as proposed, would give police the power to ticket the drivers of cycles that are missing the factory stamp  presumably cycles with excessively noisy or improperly modified pipes.