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musket
Mangled
Joined: Sep 28, 2002
Posts: 8,664
Location: Transient
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 Posted: Sun 7th Sep 10:23pm Post subject: |
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| Oli wrote: | Sram.
Shimano.
Campagnolo.
All way cooler than any damn belt drive. A belt is only good for holding up trousers.  |
Or tanning hide.
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rory161192
Thrashed
Joined: Mar 10, 2007
Posts: 1,378
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| Posted: Sun 7th Sep 10:37pm Post subject: |
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ever thought about the fact that when a belt snaps, you have to buy a whole new frame, due to the fact theres no rejoining mechanism? Sorry if this has been said already, i ant be bothered reading through 6 pages.
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Astoria Paranoia
Wrecked
Joined: Aug 20, 2002
Posts: 5,041
Location: OFF THE COAST OF SOMALIAAA!!
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| Posted: Sun 7th Sep 10:40pm Post subject: |
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| rory161192 wrote: | | when a belt snaps, you have to buy a whole new frame |
What's stopping you from just replacing the belt?
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JohnnyC
Staying Put
Joined: Jan 31, 2003
Posts: 10,887
Location: Christchurch
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| Posted: Sun 7th Sep 10:41pm Post subject: |
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| rory161192 wrote: | | ever thought about the fact that when a belt snaps, you have to buy a whole new frame, due to the fact theres no rejoining mechanism? Sorry if this has been said already, i ant be bothered reading through 6 pages. |
I would imagine there is a way to unbolt the stays somehow, make enough gap to get it out?
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rory161192
Thrashed
Joined: Mar 10, 2007
Posts: 1,378
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| Posted: Sun 7th Sep 10:43pm Post subject: |
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its a belt, unless they invent a rejoining mechanism (which they havent yet- to my knowledge). It passes through the chainstay, so you would have to fit a complete new belt inside the frames rear triangle.
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Astoria Paranoia
Wrecked
Joined: Aug 20, 2002
Posts: 5,041
Location: OFF THE COAST OF SOMALIAAA!!
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| Posted: Sun 7th Sep 10:44pm Post subject: |
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Stapler?
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pb
Thrashed
Joined: Jul 31, 2005
Posts: 1,881
Location: Christchurch
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| Posted: Sun 7th Sep 10:46pm Post subject: |
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| rory161192 wrote: | | its a belt, unless they invent a rejoining mechanism (which they havent yet- to my knowledge). It passes through the chainstay, so you would have to fit a complete new belt inside the frames rear triangle. |
Look again. Dropout unbolts to reveal a slot.
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JohnnyC
Staying Put
Joined: Jan 31, 2003
Posts: 10,887
Location: Christchurch
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| Posted: Sun 7th Sep 10:46pm Post subject: |
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| Astoria Paranoia wrote: | | Stapler? |
Brown sticky tape should hold it
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Oli
Mangled
Joined: Aug 03, 2005
Posts: 32,158
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| Posted: Sun 7th Sep 10:46pm Post subject: |
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Removable rear dropout. 
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Astoria Paranoia
Wrecked
Joined: Aug 20, 2002
Posts: 5,041
Location: OFF THE COAST OF SOMALIAAA!!
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| Posted: Sun 7th Sep 10:47pm Post subject: |
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| JohnnyC wrote: | | Astoria Paranoia wrote: | | Stapler? |
Brown sticky tape should hold it |
Nah bro hot glue 
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mtb_sloth
Worn
Joined: Jun 18, 2005
Posts: 1,019
Location: Getting away with murder
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| Posted: Sun 7th Sep 11:17pm Post subject: |
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| Conners wrote: | | big_daddy_jj wrote: | | philstar wrote: |
the other reason drag cars use big tires is that they have so much torque that you need to spread the shear force of the rubber over a grater area. |
Wouldnt that work to the opposite effect? surely running your tyres on a grater would be the last thing you want to do |
Their fat tyres have a couple of other purposes as well:
i) They flex massively as the torque is applied (initially). If you've ever seen a photo or slow-mo video of a drag car at launch, you'll know what I mean. The tyres grip, the hub spins, the tyre effectively "twists". An anti slip/traction control device of sorts.
ii) As the tyre accelerates, it increases in diameter - thus increasing the cars overall gearing. Lower gearing on launch, ramping up as the car accelerates - it's a win win. |
http://www.youtube.com/watch?v=wWce_2QM2Ro Good video of drag racing launches at 1000 frames per second. Well worth the watch.
The belts won't exhibit any noticeable stretch as you are using them, but over time the belts will stretch and need to be re-tensioned. Hence the use of a cam belt tensioner in you're car.
We need definition of friction
http://en.wikipedia.org/wiki/Friction
Belts have no friction but energy can be lost in other ways i.e. the compression and stretching of the rubber. But some of this elastic energy can be recovered...
Nice idea for commuter bikes where the low maintenance makes it attractive over chains, but I can't see it being used with a derailleur and cassette. So I don't think there is going to be a wider take up of it.
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znomit
Ridden
Joined: May 28, 2008
Posts: 203
Location: Palmy
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| Posted: Sun 7th Sep 11:40pm Post subject: |
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| mtb_sloth wrote: | | Nice idea for commuter bikes where the low maintenance makes it attractive over chains, but I can't see it being used with a derailleur and cassette. |
Yeah they need to stick on on an internal geared hub.
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Craftworks_rider
Scuffed
Joined: Aug 14, 2003
Posts: 346
Location: Berlin
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| Posted: Mon 8th Sep 12:57am Post subject: RE: Belts Is Cool |
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| tripler wrote: | | if you think that the belts on a standard 4 cylinder motor are only 15mm in width? and the torque created from a car motor is way higher than a bike could produce yet there is flexability in the belt,friction? |
The cam belt only drives the cams not the car this is less torque then what you produce on a bike.
It you look at a motor bike or super charger belt then you are talking about more torque.
Last edited by Craftworks_rider on Mon 8th Sep 10:43am; edited 1 time in total |
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tripler
Ridden
Joined: Jul 04, 2008
Posts: 202
Location: Whangarei
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| Posted: Mon 8th Sep 7:16am Post subject: |
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| Oli wrote: | Tullio Campagnolo did NOT invent the derailleur, but he did take out the first patent on one.
They were invented in the late 1800s, but it was "Velocio" or Paul de Vivie who is widely credited with popularising them with his two-speed derailleur released in 1905. |
My apo logies,most people that patent or redisign things tend to get fame for the origenal thing.
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bikeys
Dusty
Joined: Feb 10, 2008
Posts: 32
Location: gisborne
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| Posted: Mon 8th Sep 10:09am Post subject: RE: Belts Is Cool |
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[quote="tripler"] Belts flex but dont really stretch.
Honestly dont want to get into this so lets make this as simple as possible. Find someone who has a Bridgestone folding bike from 20yrs ago and ask them how there belt has been holding out, I did. Think of how many chainrings, cogs and chains that a single speed bike would have gone thru between now and then?
Lets just say the belt starts looking a hell of alot more economical to say the least.
I might add that most of the big dogs in the bike industry dont have a creative bone in there bodies and thats why they are revisting this old esra technology, hoping that some us forgot or never knew it has already been done!
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