Knocking felt on slow bumps - Triumph Bobber Forum
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post #1 of 25 (permalink) Old 10-09-2019, 11:56 PM Thread Starter
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Knocking felt on slow bumps

Over time (last 400 miles, new bike) I've felt an increasingly more apparent knocking feeling, primarily coming from the footpegs. I initially thought it was the kickstand bouncing around but it doesn't seem to be that because I can hold the stand with my heel and it still does it. It feels a lot like part of the frame is moving (or something else sorta big based on the knocking I'm feeling), but the bolts appear to be on there tight. I checked the four lower ones each side (any idea of ft-lbs torque value there?). Strangely I dont feel it that much when going faster than parking lot speeds, or maybe there is just so much else going on I cant feel it. BTW, I dont have to be going over big bumps to feel this, Its little pavement transition type bumps I'm talking about.

Could it be front suspension related? I did bottom them out pretty hard on a 3" pothole once. My nearest dealer is a few hours away, so it'd be nice to sort this out on my own.

Does anyone have any other things I can check? Anyone had this issue before?!

Last edited by Sub; 10-10-2019 at 12:00 AM.
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post #2 of 25 (permalink) Old 10-10-2019, 12:19 AM
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Hi @Sub ,

Check the two bolts (one each side) that hold the rear part of the exhaust silencer to the frame (via a bracket).

I can't say I noticed any knocking myself but within my first 1,000 miles I did notice (by accident) that both of these bolts were missing and the exhaust was just free floating! This would possibly bang/knock against the bracket.

I always assumed mine had just vibrated loose and fell out. No idea how long it had been like that.

Certainly worth a look.

Good luck and let us know how you get on?

Cheerio,

Roy
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post #3 of 25 (permalink) Old 10-10-2019, 12:25 AM Thread Starter
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Those are tight.. I just put on some silencers, remember!
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post #4 of 25 (permalink) Old 10-10-2019, 12:29 AM
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Got it..!

Well that's my ideas out.

Next?

Cheerio,

Roy
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post #5 of 25 (permalink) Old 10-10-2019, 01:57 AM
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What mods do you have on the bike?
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post #6 of 25 (permalink) Old 10-10-2019, 04:35 AM
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I have noticed the same thing. Mine has just been serviced at the main dealer who did a thorough nut and bolt check to make sure everything was as it should be. I only feel it at slow speeds - usually when I pull into our drive and usually when the steering is turned sharply to one side. If you look at the footpegs pins they are quite a loose fit and I suspect it's just the pegs transmitting the very stiff suspension setup.

Be interesting to see if other people are noticing the same thing.

Update - I've just been out and given everything a good shake and there's nothing obvious other than the footpegs are quite loose on the pins. I think I shall try some form of rubber washer on the pins to take up the slack and see if that makes any difference - but I'm pretty sure the knocking is just vibration being transmitted through the frame and showing up as movement in the footpeg pins.

Honda CBF 500 for when I am being sensible
Triumph Bobber for all other times

Last edited by Taurus; 10-10-2019 at 04:50 AM.
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post #7 of 25 (permalink) Old 10-10-2019, 08:27 AM
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I get 'feedback' through the rear brake pedal when coming to a halt. I presume this is ABS kicking in.

It's like a feathering or vibration.
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post #8 of 25 (permalink) Old 10-10-2019, 11:59 AM
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Sub, depending on your weight it could be the rear shock "bottoming out".

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post #9 of 25 (permalink) Old 10-10-2019, 06:48 PM Thread Starter
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Chico, I am within the acceptable weight range. I can feel there is ample suspension travel left front and rear.

Kilyung, I have felt this knocking since before any mods went on.

Chez, you may want to use a little less rear brake!

Taurus, we have the same issue!! Please let me know if you are able to get it to go away.
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post #10 of 25 (permalink) Old 10-10-2019, 09:00 PM
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You made me curious. My bike makes a dull knocking sound when I roll out of garage onto to the street. I gave the rear caliper a shake and it’s loose on the caliper pins. Normal because the brake is not applied. Might be the source of your ghost.
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