quieting the drive train
mike
not produce an angle in the chain at the idler. To overcome this,
either the chainrings need to be shifted outboard or the freehub moved
outboard. I have a very thin washer on the inner idler axle.
I can overlube and quiet things down.
Last night I decided to shift an old bacchetta idler over replaing the
Terracycle. I also changed the 404 wheelset for a mavic cxp 33
ultegra set I had on a litespeed tt bike as a training set.
The results. A significantly quieter ride. I did feel as if the
front end is jumping when turning on slightly bumpy roads. The 404
tubulars with conti competition seem much more behaved at the same
pressure and speed.
I have a small frame so anticicpate I might have more chainline issues
than those with longer chains.
Any thoughts?
Mike
joseph joseph
| The Dragon is so much quieter than my Aero was that I havn't even thought about it. --- On Wed, 3/31/10, mike <mikea...@aol.com> wrote: |
|
ROBERT JOHNSON
Noise is not necessarily a direct indication of drivetrain efficiency which is a common mistake many riders make. The cog on the power side of the over/under TerraCycle idler is much more efficient at transmitting power than a soft rubber idler even though one may be louder than the other. So you have to ask yourself what you are trying to achieve, a quiet drivetrain or an efficient drivetrain? The idler floats side to side so the chain angle is reduced when shifting gears. Some angle in a drivetrain is completely normal and some gears will be quieter than others. I think that shifting to the Bachetta idler is a mistake, but then again I am somewhat biased since I made your Terracycle idler, but we have a huge amount of experience with these things on a daily basis so kind of know what we are talking about. No bike is completely quiet in all gears even very expensive diamond frame racing bikes with very high end components.
robert
> Date: Wed, 31 Mar 2010 18:22:31 -0700
> Subject: quieting the drive train
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mike
I like my Terra cycle idlers. I have them on bikes and trikes.
I use them as i believe them the most efficient.
I don't find them always quieter.
I believe in the sliding idler concept. I was discussing here is on my
bike I note the chainline has a lateral shift at the idler more than
half the gears.
I note the drivetrain is quietest when the chainline is straight, not
diverted laterally at the idler. Just wondering if efficiency and
noise could be improved if NO lateral shift of the chain occured on
the power side.
I switched to the bacchetta idler last night after using the
terracycle idler for nearly two years on the Sea Dragon. I also
switched wheels. I think the carbon wheels, the carbon seat and the
carbon frame all increase the sound to an ear that is closer to the
relatively noisy end of a powertrain on a recumbent.
My bike is quieter with the Bacchetta idler. Chainline angle is not
improved. I have to believe I lost some efficiency and power, but
noise reduction was the plan. The switch was succesful in that
respect. Terracycle will be back on for the races.
I appreciate your comments and have long been a terracycle fan.
Mike
On Apr 1, 5:14 pm, ROBERT JOHNSON <captjohns...@msn.com> wrote:
> Mike,
>
> Noise is not necessarily a direct indication of drivetrain efficiency which is a common mistake many riders make. The cog on the power side of the over/under TerraCycle idler is much more efficient at transmitting power than a soft rubber idler even though one may be louder than the other. So you have to ask yourself what you are trying to achieve, a quiet drivetrain or an efficient drivetrain? The idler floats side to side so the chain angle is reduced when shifting gears. Some angle in a drivetrain is completely normal and some gears will be quieter than others. I think that shifting to the Bachetta idler is a mistake, but then again I am somewhat biased since I made your Terracycle idler, but we have a huge amount of experience with these things on a daily basis so kind of know what we are talking about. No bike is completely quiet in all gears even very expensive diamond frame racing bikes with very high end components.
>
> robert
>
>
>
> > Date: Wed, 31 Mar 2010 18:22:31 -0700
> > Subject: quieting the drive train
> > From: mikeatl...@aol.com
> > To: car...@googlegroups.com
>
> > when I sight along the chain I not that only about half the gears do
> > not produce an angle in the chain at the idler. To overcome this,
> > either the chainrings need to be shifted outboard or the freehub moved
> > outboard. I have a very thin washer on the inner idler axle.
>
> > I can overlube and quiet things down.
>
> > Last night I decided to shift an old bacchetta idler over replaing the
> > Terracycle. I also changed the 404 wheelset for a mavic cxp 33
> > ultegra set I had on a litespeed tt bike as a training set.
> > The results. A significantly quieter ride. I did feel as if the
> > front end is jumping when turning on slightly bumpy roads. The 404
> > tubulars with conti competition seem much more behaved at the same
> > pressure and speed.
>
> > I have a small frame so anticicpate I might have more chainline issues
> > than those with longer chains.
>
> > Any thoughts?
>
> > Mike
>
> > --
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