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post #1 of 11 (permalink) Old 04-21-2017, 02:01 PM Thread Starter
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Speedo Issue With Flat Mount Gauge Bracket - Street Twin


I ride a 2016 Street Twin and was wondering whether anyone on here has any experience with installing a flat mount gauge bracket for their speedo. Need some help and can maybe provide a heads up for anyone planning a similar mod to their bike. From what I am aware it's a pretty common modification, but I am having a nightmare with my speedo since installing mine!

The needle vibrates way too much, but works accurate enough to begin with, but once I reach a steady speed, ie. on a motorway, the needle just goes haywire and stays up real high, reading blaringly inaccurate speeds once I slow down. When I shut down the bike the speedo resets itself, and seems to work again until I reach a steady speed and then the problem repeats itself.

I can confirm that there was no issue with the OEM speedo bracket. My bracket is from Moto Trio, but British Customs make an almost identical part. HEADS UP - If you have clip on bars like me then the BC bracket will not be compatible as your clip ons will be in the way of where it bolts in!

I took the bike to Triumph for it's 1st service and they swapped out the actual speedo for a new one, and the problem persists. They are flat out blaming the angle of the aftermarket bracket, as to be fair, there was no issue before.

To be clear - I am NOT trying to smear Moto Trio here, they have been helpful and apparently I am the only one with this issue. I am just looking for anyone else who has installed this part to hopefully gain some insight and maybe find a solution! Is this an issue with the bracket or are Triumph just using it as an excuse to wash their hands of a technical fault?

Thanks in advance for anyone who can provide any help. Will ad some pics below so you can see the part.
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post #2 of 11 (permalink) Old 04-21-2017, 02:21 PM
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Forgive my ignorance but how does a modern speedo like we have even work? Back in the day (my only other bikes are much older), there was a flexible cable that would rotate with the front hub and physically turn the instrument dials. I suspect modern clocks have nothing like that and are entirely electronic?

If the latter is true, the speedo should work in any position, as there is no mechanical spinning cable to worry about becoming kinked or otherwise disengaged.
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post #3 of 11 (permalink) Old 04-21-2017, 02:51 PM Thread Starter
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To be honest with you Delta, I have no clue either. I have tried google to try and unlock the mystery of the workings of a modern Triumph speedo, to no avail. I am hoping someone might enlighten me and help solve the issue.

Triumph mentioned something about a magnet, and that the angle of the speedo affects the magnet controlling the needle. When I mentioned to Triumph that the new Bobber has a completely adjustable speedo angle, with a similar needle display, their response was basically - it's a different speedo that has been tested to work that way.

I am no expert. Maybe I have messed up my speedo by putting it at a different angle, but it just seems so unlikely. Triumph are unwilling to explore any other possible cause until I return my bike to stock set up.

It would be telling to see if anyone else has had similar issues with a flat mount speedo bracket.
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post #4 of 11 (permalink) Old 04-21-2017, 03:07 PM
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@Triumph Brat Several folks on this board have that or similar speedo brackets installed, try searching for their threads and sending them a private message. I also suspect this should work just fine, and that something else is the culprit. Good luck.
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post #5 of 11 (permalink) Old 04-21-2017, 03:19 PM Thread Starter
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Thanks @Delta I will have a look! I was hoping this thread would drag them all out so I could get a well rounded consensus and we could combine our knowledge.
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post #6 of 11 (permalink) Old 04-21-2017, 05:27 PM
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Hmm, that kinda' sucks. I don't know about mine yet as I won't be insuring 'til mid-May. Did you make sure to retain any rubber-mounted parts? I don't recall the installation details but it seems to me there was rubber mounting involved and your issue sounds like it could be vibration related. I hope I don't find the same problem with my bike but will report back whatever I find out once I'm back on the road...

Edit: Looking at your pics I see you've installed clip on bars and that they appear to be mounted directly to forks. This may be a long shot and I'm guessing the speedo mount may have been added at same time as clip-ons; don't know... but if nothing else resolves the issue you might try re-installing stock bars with stock risers and going for a test ride. It could be that the stock rubber-mounted bars were an influence on the general distribution and absorption of vibrations in the upper fork area. If the stock bars and mounts (and rider's arms) are no longer absorbing vibes in the same way they did previously - where are those vibes going to go? To the speedo? It's just a thought.

I've also installed HVMP 14 oz bar end weights... http://www.hvmp.com/Default.asp ...and if you find that stock bars/risers do solve the problem, you might try super heavy weights on your clip-ons or some additional rubber damping for them to deal with what may be poorly re-distributed vibes. Good luck with it and be sure to keep us up-dated.

Last edited by Featherock; 04-21-2017 at 05:58 PM.
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post #7 of 11 (permalink) Old 04-21-2017, 11:15 PM
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The speedo is controlled by a stepper motor. If it vibrates too much it loses track of where it is, and since the reading is changed by relative amounts of will be out of whack.
The only thing you can do is try and damp the speedo. If you can fit some rubber tap washers between the mount and the dials that might help, but you may need them on both sides of the fitting so the dials can move.
The other thing is to try adding weight to the speedo itself, but that's a pain.

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post #8 of 11 (permalink) Old 04-22-2017, 12:05 AM
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I installed the British Customs flat bracket a little over a week ago and haven't noticed a problem.
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post #9 of 11 (permalink) Old 04-22-2017, 03:25 PM
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@Triumph Brat noticed that speedo needle on my 2016 ST vibrates sometimes like you described. running a stock setup here.

only thing i can relate the issue on my bike is to an over torqued bolt, one used to mount the engine dresser bar, the top one. correct torque for that one is 80 Nm. tighten it some more and one gets some decent amount of vibes though the bars.

worth a check i guess. along with other possible causes as what member @jsobell said makes sense.
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post #10 of 11 (permalink) Old 04-23-2017, 05:46 AM Thread Starter
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Cheers everyone for the feedback!

I had a feeling that vibrations must be causing the problem, but I never thought about my clip-ons being the prime culprits as you suggested @Featherock . This may also explain why Moto Trio haven't had any other complaints with the bracket, maybe most other users are installing it with a stock handlebar set up?

Also, vibrations would explain why the speedo seems to work at low speeds and then goes haywire at prolonged higher speeds/motorway riding.

There are three rubber tap washers that are installed in the stock speedo bracket, which you swap out and plug into the Moto Trio bracket before bolting the speedo back to it. Obviously in my case, and with my set up, this hasn't been enough to dampen the vibrations.

I've been looking online to try and find some more of these rubber type plugs/washers to maybe try some at the other of the bracket as well, where it mounts up into the handlebar risers, to give some extra dampening as you suggested @jsobell but I can't find any anywhere! If anyone has any suggestions?

I will definitely try some bar end weights, and returning my handlebars to a stock set up to see what effects this has. I will need to order the bar end weights online so it may take some time, but I will report the results back to this thread!

@ICON636 - Thanks for your feedback. I would love to know - do you have a stock handlebar set up on your Street Twin?
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