Dynamic chain tensioner - Triumph Forum: Triumph Rat Motorcycle Forums
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post #1 of 14 (permalink) Old 05-14-2017, 07:11 PM Thread Starter
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Dynamic chain tensioner

Has anyone tried one of these? A guy at the Harley hang out said to look into one while he was drooling on my scramble the other day...


https://www.freespiritsparts.com/en/...h-classic.html
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post #2 of 14 (permalink) Old 05-14-2017, 07:21 PM
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I don't understand the purpose of this device...and the website does a pretty vague job of explaining it. I wouldn't trust anything that comes from the owner of a Harley, least of all matters of chains.
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post #3 of 14 (permalink) Old 05-14-2017, 08:58 PM
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The Buell machines required belt tensioners due to chassis geometry.
The linked outfit is selling billet foo-foo.

Rex
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post #4 of 14 (permalink) Old 05-14-2017, 10:13 PM
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There is nothing difficult about making the tensioner and if it was useful, it would have been installed on bikes back when they were converted from belt to chain drive. The tensioner needs to be weakly spring loaded to permit variation in rear wheel axle to transmission output shaft center to center distance while the swing arm moves through its travel. The tensioner will simply adjust as needed and so it might as well not be there.

There is a point in swing arm travel when the chain can be no shorter. Chain slack is determined by a mfr. with a known shock length keeping in mind that the chain must have slack during the entire swing arm travel. If you would determine the shock length at minimal shaft c-c distance and set chain slack there, you could use a fixed-mount chain tensioner but there would be slack in the chain before and after that point. Rotate the rear wheel to get minimal slack to account for varied chain stretch.

You can see more if you disconnect the rear shocks and then watch chain slack while moving the rear wheel up and down. Changing rear shock length will require a new chain slack specification.

It would be good to hear from someone who has actually used a chain tensioner and why they like it or not.

Added Note: The above info was posted in reply to a Triumph owner with Triumph and similar bikes in mind.

Last edited by Ntnbutrbl; 05-16-2017 at 01:55 PM.
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post #5 of 14 (permalink) Old 05-15-2017, 07:07 AM
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Chain Tensioner - back in my younger days I had 1 fitted to my motorcross bike.
With MX bikes there's a lot of rear suspension travel happening. The tensioner reduced constant chain tensioning adjustments and IMO reduced sprocket wear. Reduces chain backlash etc. Weighup if the cost is effective enough to install one.
Would I fit one to my Bonney - tempted but my bike use doesn't warrant it. As the new Bonneys don't leak oil or require maintenance like the old generation, there's more leisure time to tweak chain tension, polish & shine etc
sure


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post #6 of 14 (permalink) Old 05-15-2017, 07:27 AM
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post #7 of 14 (permalink) Old 05-15-2017, 08:22 AM
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Useful on a bike with massive suspension movement not much so on a bonnie .
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post #8 of 14 (permalink) Old 05-16-2017, 04:32 AM
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Quote:
Originally Posted by Captain Bert View Post
Chain Tensioner - back in my younger days I had 1 fitted to my motorcross bike.
With MX bikes there's a lot of rear suspension travel happening. The tensioner reduced constant chain tensioning adjustments and IMO reduced sprocket wear. Reduces chain backlash etc. Weighup if the cost is effective enough to install one.
Would I fit one to my Bonney - tempted but my bike use doesn't warrant it. As the new Bonneys don't leak oil or require maintenance like the old generation, there's more leisure time to tweak chain tension, polish & shine etc
sure
+1, same here ,off road yes ,road bike ,not needed.

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post #9 of 14 (permalink) Old 05-16-2017, 07:29 AM
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Some small bikes with Custom styling and long wheelbase need a tensioner as the distance gearbox sprocket-rear wheel is very long, the Daelim Daystar 125 for example, a factory standard fitting:

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post #10 of 14 (permalink) Old 05-16-2017, 10:10 AM
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Quote:
I wouldn't trust anything that comes from the owner of a Harley, least of all matters of chains.
ZING!

IMHO, the modern Bonneville platform does not warrant a dynamic chain tensioner. Not enough wheel movement and/or chain length in stock trim.

Now, maybe some of these wild Scrambler/off-roading Bonnies with shocks longer than 370mm justify the mod. I can't see the need on a street bike.

/M
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