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Chains vs. Shafts vs. Belts?
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Chains vs. Shafts vs. Belts? - October 16, 2007, 12:52 PM

We all seem to have chains. The BMW folks have drive shafts. I understand we stay away from those mostly due to weight concerns. But Chains are a PITA, so I'm wondering why we don't see ANY belts. My brother in-law's father has a custom Harley with a giant belt. Why don't we? Are there any belt kits out there for us?
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October 16, 2007, 12:55 PM

Chains are easier to package. A belt strong enough for a sportbike would likely be 4 to 6 inches wide. Instead of less than 1 inch.


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October 16, 2007, 12:58 PM

Couldn't they make the belt out of kevlar or something?
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October 16, 2007, 01:01 PM

http://www.riderforums.com/archive/i...hp/t-1865.html

good thread already done on this subject here!
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October 16, 2007, 01:11 PM

Thanks for the link.

After reading it, I'm not convinced we can't have a belt drive. All it says to me is that we haven't had a belt drive. We can make a strong enough, small enough belt. We just need someone to do it.
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October 16, 2007, 01:39 PM

Quote:
Originally Posted by Cutter
After reading it, I'm not convinced we can't have a belt drive. All it says to me is that we haven't had a belt drive. We can make a strong enough, small enough belt. We just need someone to do it.
Sounds like you've found your winter project!


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October 16, 2007, 02:34 PM

The Buell 1175 uses a belt.

I found an even better reason or justification. Buell race bikes use chains while the street bikes use belts. Why? You can adjust a chain/sprocket/suspension etc much easier with a chain. There's not good way to do that with a belt.

Still, don't most of us use our bikes primarily if not entirely on the street?
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October 16, 2007, 02:36 PM

Buell, all belt drives. There is no issue with strength or wear, just the inability to adjust gearing and potential for breaks should a forgine object get between the belt and a pully.


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October 16, 2007, 03:06 PM

Quote:
Originally Posted by Cutter
The Buell 1175 uses a belt.

I found an even better reason or justification. Buell race bikes use chains while the street bikes use belts. Why? You can adjust a chain/sprocket/suspension etc much easier with a chain. There's not good way to do that with a belt.

Still, don't most of us use our bikes primarily if not entirely on the street?
I didn't want to get into that with you as I figured you knew all that stuff and just want the info you asked for.
On my 1000 I have it geared down so it accelerates better as I don't care so much about top end especially on the street.
On the track for a 600 gearing it down will help coming out of the corners on short tracks this could be huge.

I have owned shaft and didn't like not being able to change for what riding I wanted to do.
With chains strength today, if you take care of it like you should, it will probably last you almost the life of your bike. If it is stretching a lot it needs to be oiled more frequently and when adjusted proper slack is crucial to long life!

Last edited by n2sport; October 16, 2007 at 03:09 PM..
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October 16, 2007, 03:10 PM

What percentage of bikes do you think have their gearing changed?
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October 16, 2007, 03:12 PM

Quote:
Originally Posted by Cutter
What percentage of bikes do you think have their gearing changed?
About the same amount as short people needing to lower their bikes

I would say look at the sale of different sized sprockets for these or lowering links.
People do it all the time!

I guess the point is sprockets/chains give you the flexibility while belts do not.
Drag racing, Track days, Long distance riding, 200mph runs, all of these require this adjustment.
Even stock 1000cc's are geared so they can compete with the next "fastest" production bike. This doesn't give you the best real world gearing. The GSXR with the ability to do 186 stock means giving up some low end to get to that number even if it is just on paper.

Last edited by n2sport; October 16, 2007 at 03:17 PM..
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October 16, 2007, 03:53 PM

Which brings me to my next topic...
CVT's... why no Continously Variable Transmissions? Seems like they'd be perfect for bikes.
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October 16, 2007, 04:06 PM

CVTs are horribly inefficient. Especially belt/chain drive setups. Most of the newer CVT technologies (i.e. Nissan's toroidal design) can't handle the power or RPM of a crotch rocket engine, nor the cold temperatures seen in the U.S. Not only that, CVTS are still (for the most part) complicated and unproven designs, with the exception of snowmobile applications.


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October 17, 2007, 08:55 AM

The title of this post is kinky.


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October 17, 2007, 08:58 AM

Did you intend the pun?
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