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12 Lb flywheel for Kurt Kinetic Road Machine

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12 Lb flywheel for Kurt Kinetic Road Machine

Old 07-28-12, 05:48 PM
  #1  
Carbon Unit
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12 Lb flywheel for Kurt Kinetic Road Machine

Anyone use the additional 12 lb flywheel on their KK Road Machine? I am trying to determine if it worth adding one. All the new machines are capable of adding the larger flywheel but my machine was made about 6 months before Kurt made the change.

Any idea what they changed? A machine built since 2010 can add the extra flywheel for about $80.00. It would cost me $350 to add it to my machine which is more than I paid for it. I would think a machinist could make the modifications so that an older machine could accept the larger flywheel but it might not be worth the effort.

I don’t need the trainer now but in the winter months, I might start using it again.
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Old 07-28-12, 06:28 PM
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Hida Yanra
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nope - not worth it.
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Old 07-29-12, 06:22 AM
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Why are you so concerned that you need that heavier flywheel anyway?
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Old 07-29-12, 06:33 AM
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It adds more weight which gives it greater momentum which is supposed to more realistically mimic a road ride. It'll have longer spin up and coast down times. Most likely not worth worrying about it.
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Old 07-29-12, 07:27 AM
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I know what the brochure says, but why does it matter? Besides, it's going to take a lot more than a flywheel to make a trainer ride similar to a road ride.
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Old 07-29-12, 07:35 AM
  #6  
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I'm not talking out of the brochure but from riding it (the larger flywheel, not the brochure). So it matters if one wants more momentum. It provides a better ride. Some spin bikes have larger and heavier flywheels. They're a better ride than the spin bikes with smaller and lighter flywheels. Same physics at work here.

Last edited by gsteinb; 07-29-12 at 07:41 AM.
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Old 07-29-12, 08:24 AM
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I have it, I used it once.
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Old 07-29-12, 09:00 AM
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I bought my KK used and it came with one. Note that it is only recommended for steady/tt type stuff and not intervals, which is all I use my trainer for. Also, with regular tires (krylions & GP4000s) you need to crank it down a crazy amount to prevent slipping. The one time I tried it with a Vittoria trainer tire it worked better.
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Old 07-29-12, 10:18 AM
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Thanks for responding. I had considered the heavier flywheel so ghat I could do 2 hour rides during the winter. However, the more I thought about it the less I wanted to be on a trainer for 2 hours. So I agree it isn't worth getting it. I will stick with using the trainer for intervals.
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Old 07-29-12, 10:25 AM
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My Trutrainer roller has a flywheel that is fixed, always on. I find the ride much more realistic compared to other rollers I've tried.
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Old 07-29-12, 12:32 PM
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If I had one I would take it off. The best use of the trainer for me is for shorter interval sessions. A heavy flywheel would make these more difficult.

Spend you money on Spinervals or CTS DVD's and you will have more effective and far more enjoyable trainer workouts.
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Old 07-29-12, 01:08 PM
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I want to use the trainer as a training tool to simulate intervals and hill climbs. My KK doesn't provide as much resistance as a spin bike but I think I can still improve my hill climbing with it by pushing it until my legs are burning.
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Old 07-29-12, 05:51 PM
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Originally Posted by Carbon Unit View Post
I would think a machinist could make the modifications so that an older machine could accept the larger flywheel but it might not be worth the effort.
I'm in the same situation and looked at his before.

Originally Posted by Kurt Kinetic Website
Can I upgrade my Kinetic Road Machine so I can use the optional 12 lb. flywheel that comes with the Kinetic Pro Machine?

No we are sorry but you cannot. The Pro Machine was designed specifically for use with the extra weight of the optional 12 lb. flywheel. Because of the extra weight, it requires a bigger 16mm shaft (versus the 12mm of the Road Machine) and also the Pro Machine’s 16 mm shaft is threaded to accept the attachment bolt to hold the 12 lb. flywheel in place.
They are talking about a cross sectional area of 113cm^2 for the older model and 201cm^2 for the new/pro unit. I would take their advice on the additional weight.

Originally Posted by Kurt Kinetic Website
Do I need to recalibrate my Kinetic Power Computer when using the optional 12 lb. flywheel that comes with the Pro Trainer?

No. It’s the fluid chamber alone that provides the resistance and so the resistance does not change, even with the additional 12 lb. flywheel. The extra weight of the 12 lb. flywheel is only designed to make the ride even smoother and to replicate the outdoor road ride. Because the fluid chamber alone provides the resistance, there is no need to recalibrate the Kinetic PC when using either just the 6 lb. permanent flywheel or the additional 12 lb. flywheel.
As others have stated, doesn't seem worth it.
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Old 07-29-12, 06:26 PM
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Originally Posted by jrobe View Post
If I had one I would take it off. The best use of the trainer for me is for shorter interval sessions. A heavy flywheel would make these more difficult.
Why would a heavier flywheel make the sessions more difficult? With the heavier flywheel it does a better job of simulating the inertial load you have when riding outdoors.
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Old 07-29-12, 06:33 PM
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Originally Posted by Carbon Unit View Post
I want to use the trainer as a training tool to simulate intervals and hill climbs. My KK doesn't provide as much resistance as a spin bike but I think I can still improve my hill climbing with it by pushing it until my legs are burning.
The reality of using the heavier flywheel is that your tire will lose contact with the roller more easily during the acceleration of an interval. This requires backing off a bit, contrary to your goal.

Just use a bigger gear if you want more resistance.
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Old 07-29-12, 06:44 PM
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Originally Posted by rogerstg View Post
The reality of using the heavier flywheel is that your tire will lose contact with the roller more easily during the acceleration of an interval. This requires backing off a bit, contrary to your goal.

Just use a bigger gear if you want more resistance.
Hrm, this is exactly why i wanted the heavier flywheel. I wonder if a trainer specific tire would have enough grip? Right now I just use worn out GP4000s's on the trainer.
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Old 07-29-12, 07:34 PM
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i have it, no issues with intervals, I like it.
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Old 07-29-12, 08:23 PM
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Originally Posted by darb85 View Post
i have it, no issues with intervals, I like it.
Me too!
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Old 07-29-12, 08:50 PM
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If you ever want to take your trainer to events for warm ups, an extra 12lbs to lug around sounds irritating.
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Old 07-29-12, 10:02 PM
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Originally Posted by Beaker View Post
If you ever want to take your trainer to events for warm ups, an extra 12lbs to lug around sounds irritating.
It might be irritating for some people but I don't race so I would never take a trainer anywhere. Also, I think the larger flywheel come off in a few seconds.
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Old 07-30-12, 06:59 AM
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Originally Posted by jmX View Post
Hrm, this is exactly why i wanted the heavier flywheel. I wonder if a trainer specific tire would have enough grip? Right now I just use worn out GP4000s's on the trainer.
I've used various tires including GP4000 and the Conti trainer tire and tighten the contact knob as much as I can by hand (more than the recommended amount by Kurt). Still, there seem to be others that have no issues with slipping when they sprint so I wonder what is different.
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Old 07-30-12, 07:01 AM
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Originally Posted by Beaker View Post
If you ever want to take your trainer to events for warm ups, an extra 12lbs to lug around sounds irritating.
You can easily remove it and leave it at home for those situations
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Old 07-30-12, 07:35 AM
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Originally Posted by rogerstg View Post
I've used various tires including GP4000 and the Conti trainer tire and tighten the contact knob as much as I can by hand (more than the recommended amount by Kurt). Still, there seem to be others that have no issues with slipping when they sprint so I wonder what is different.
I had slip problems using worn Krylions and possibly a GP4000s (can't remember if tried it). Seems the one time I used it with a Vittoria trainer tire (red) it worked better. But I have since removed the extra weight.

Per Kurt's literature, the added weight is really only meant for endurance/tt training as it keeps your spin going at a more consistent rate. They recommend removing it for intervals, possibly due to slippage issues. And note that it doesn't add any resistance once you have it at speed, it only takes a little longer to get it there and holds it at speed longer.

And yes, it is not difficult to install or remove it.
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Old 07-30-12, 07:59 AM
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I bought the "pro machine" I think it was on clearance from performance and it came with the flywheel. It makes long tempo and endurance workouts feel much more natural. Not the thing for intervals though. Overall I'm glad I have it.
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Old 07-30-12, 08:59 AM
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Originally Posted by darb85 View Post
i have it, no issues with intervals, I like it.
Same here. If the tire is slipping, just increase the pressure until it doesn't.

Originally Posted by Carbon Unit View Post
I want to use the trainer as a training tool to simulate intervals and hill climbs. My KK doesn't provide as much resistance as a spin bike but I think I can still improve my hill climbing with it by pushing it until my legs are burning.
I've never been on a spin bike, so can't comment on its resistance. If you are stronger than the resistance the KK provides, you should be pro. You'd have to be able to do 40-45 mph on flats to max out a KK fluid unit.
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