Bonneville front sprocket question - Triumph Forum: Triumph Rat Motorcycle Forums
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post #1 of 13 (permalink) Old 04-21-2017, 12:17 PM Thread Starter
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Question Bonneville front sprocket question

The OEM sprockets/chain kit has a front sprocket with some form of rummer damper integral with it. Aftermarket sprockets do not have this (as far as I can tell). What would the effects be of not having the rubber bits? Does anyone have experience with the aftermarket sprockets?

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Walt
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post #2 of 13 (permalink) Old 04-21-2017, 12:36 PM
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The rubber on the stock sprocket is supposed to dampen noise. I recently switched to an aftermarket sprocket (British Customs) that does not have this and it's fine. Others have said they notice them being a bit louder, but I can't tell the difference.
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post #3 of 13 (permalink) Old 04-21-2017, 12:37 PM
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It is supposed to damp down chain noise, it doesn't really work after the first few miles. Just use the aftermarket ones, no real difference.
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post #4 of 13 (permalink) Old 04-21-2017, 01:47 PM
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Had this same experience on my KLR650. No operational difference between the two otherwise.

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post #5 of 13 (permalink) Old 04-21-2017, 02:00 PM
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The sprocket cover used to include a foam pad fitted to the inside surface, just as usless and eventually deleted.
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post #6 of 13 (permalink) Old 04-21-2017, 02:45 PM
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I don't notice extra noise from the lack of that rubber stuff either.
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post #7 of 13 (permalink) Old 04-21-2017, 03:16 PM Thread Starter
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Thanks to all for the responses. For the significant difference in cost, I'll go with the aftermarket kit, too. At my age, I'll probably never wear the new one out.
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post #8 of 13 (permalink) Old 04-21-2017, 08:53 PM
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Quote:
Originally Posted by boatanchors View Post
The OEM sprockets/chain kit has a front sprocket with some form of rummer damper integral with it. Aftermarket sprockets do not have this (as far as I can tell). What would the effects be of not having the rubber bits? Does anyone have experience with the aftermarket sprockets?

Many thanks,
Walt

1 HP.
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post #9 of 13 (permalink) Old 04-22-2017, 04:46 AM
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There's also a sound absorber inside the clutch cover. Together with the sprocket thing it's a way of reducing sound levels for Government homologation tests which involve running the machine past a fixed microphone at a certain speed/revs.

The human ear might not notice the difference, but the microphones will, as they're able to pick up frequencies and noises that we can't. Sometimes manufacturers deliberately over-gear the bike so that it does the right speed past the testing mikes but at lower revs, it's cheating, yes, and the reason why dropping a tooth or two often results in improved overall performance.

Last edited by Forchetto; 04-22-2017 at 04:48 AM.
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post #10 of 13 (permalink) Old 04-22-2017, 11:37 AM
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Quote:
Originally Posted by yrunvs View Post
1 HP.
I ordered a JT front sprocket, simple solid steel. What was delivered was a fancy SprocketLite sprocket all drilled out for weight savings. At first I wasn't impressed, but once I got on the bike damned if I didn't get an extra 1.1 HP. Count me thrilled
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