Bike pron

Resound

"tim" <timpaton@gmail.com> wrote in message
news:7e074a9b-4b80-4a9e-b06d-b50c4927a821@i12g2000prf.googlegroups.com...
> On Feb 25, 8:31 am, "Theo Bekkers" <tbekk...@bekkers.com.au> wrote:
>> That brings up another point. Can you have suspension with belt drive?
>> ...would not the pivot point need to be at the centre of the bottom
>> bracket?
>
> Pretty much.
>
> It's the same with single-speed chain drive; either the swing-arm has
> to pivot around the BB centre, or you need a spring loaded chain
> tensioning device to take up the varying amounts of slack.
>
> You could do the same with a belt, I guess, but you'd need more
> tension than for a chain drive so you'd need a heavily spring-loaded
> tensioner.
>


Assuming the tooth pitch was the same, you could just get a car's cambelt
tensioner from a wrecking yard. A wee bit of fabrication for the mount and
you're away.

Nick Payne

"Jack Russell" <jackr@norubbish.tpg.com.au> wrote in message
news:47c1400b@dnews.tpgi.com.au...
> Can I ask where you got the bikes. I am thinking of getting a Thorn Raven
> but would rather spend the money in Australia.
>
Rohloff #1 was a retrofit to a Litespeed Blue Ridge that I bought in the US.
Rohloff #2 went in a tandem frame that was built by Wayne Kotzur in
Gundaroo. Rohloff #3 went in a Raven that I bought from the SJS Cycles eBay
store a couple of years back:
http://stores.ebay.com.au/St-John-S...3QQftidZ2QQtZkm.
They were flogging the previous years Raven Sport Tour models in XL and XS
sizes pretty cheaply, and my wife is a good fit on an XS frame. I also
bought Rohloff #3 on eBay quite cheaply in relative terms - unused for just
over $1000.

Only last month someone in Melbourne was selling a Rohloff-equipped MTB on
eBay - it went for $875. I seriously thought about bidding but decided that
a) I didn't need another Rohloff hub and b) I would wait for the new model
hub that Rohloff are supposed to be bringing out this year to see if they
come out with a shifter that is a better match for drop bars.

Nick

Jack Russell

hanks for the info

Nick Payne wrote:
> "Jack Russell" <jackr@norubbish.tpg.com.au> wrote in message
> news:47c1400b@dnews.tpgi.com.au...
>
>> Can I ask where you got the bikes. I am thinking of getting a Thorn
>> Raven but would rather spend the money in Australia.
>>
> Rohloff #1 was a retrofit to a Litespeed Blue Ridge that I bought in the
> US. Rohloff #2 went in a tandem frame that was built by Wayne Kotzur in
> Gundaroo. Rohloff #3 went in a Raven that I bought from the SJS Cycles
> eBay store a couple of years back:
> http://stores.ebay.com.au/St-John-S...3QQftidZ2QQtZkm.
> They were flogging the previous years Raven Sport Tour models in XL and
> XS sizes pretty cheaply, and my wife is a good fit on an XS frame. I
> also bought Rohloff #3 on eBay quite cheaply in relative terms - unused
> for just over $1000.
>
> Only last month someone in Melbourne was selling a Rohloff-equipped MTB
> on eBay - it went for $875. I seriously thought about bidding but
> decided that a) I didn't need another Rohloff hub and b) I would wait
> for the new model hub that Rohloff are supposed to be bringing out this
> year to see if they come out with a shifter that is a better match for
> drop bars.
>
> Nick


--
Remove norubbish to reply

lemmiwinks.au@gmail.com

On Feb 25, 6:37 pm, "Resound" <sacredc...@bigpond.com> wrote:
> "tim" <timpa...@gmail.com> wrote in message
>
> news:7e074a9b-4b80-4a9e-b06d-b50c4927a821@i12g2000prf.googlegroups.com...
>
> > On Feb 25, 8:31 am, "Theo Bekkers" <tbekk...@bekkers.com.au> wrote:
> >> That brings up another point. Can you have suspension with belt drive?
> >> ...would not the pivot point need to be at the centre of the bottom
> >> bracket?
>
> > Pretty much.
>
> > It's the same with single-speed chain drive; either the swing-arm has
> > to pivot around the BB centre, or you need a spring loaded chain
> > tensioning device to take up the varying amounts of slack.
>
> > You could do the same with a belt, I guess, but you'd need more
> > tension than for a chain drive so you'd need a heavily spring-loaded
> > tensioner.
>
> Assuming the tooth pitch was the same, you could just get a car's cambelt
> tensioner from a wrecking yard. A wee bit of fabrication for the mount and
> you're away.

Assuming you put the tensioner on the outside of the belt you wouldn't
need to worry about the tooth pitch :-)

Resound

<lemmiwinks.au@gmail.com> wrote in message
news:1ee3f328-1c9b-4f8b-bf36-086e7a7d0460@e23g2000prf.googlegroups.com...
> On Feb 25, 6:37 pm, "Resound" <sacredc...@bigpond.com> wrote:
>> "tim" <timpa...@gmail.com> wrote in message
>>
>> news:7e074a9b-4b80-4a9e-b06d-b50c4927a821@i12g2000prf.googlegroups.com...
>>
>> > On Feb 25, 8:31 am, "Theo Bekkers" <tbekk...@bekkers.com.au> wrote:
>> >> That brings up another point. Can you have suspension with belt drive?
>> >> ...would not the pivot point need to be at the centre of the bottom
>> >> bracket?
>>
>> > Pretty much.
>>
>> > It's the same with single-speed chain drive; either the swing-arm has
>> > to pivot around the BB centre, or you need a spring loaded chain
>> > tensioning device to take up the varying amounts of slack.
>>
>> > You could do the same with a belt, I guess, but you'd need more
>> > tension than for a chain drive so you'd need a heavily spring-loaded
>> > tensioner.
>>
>> Assuming the tooth pitch was the same, you could just get a car's cambelt
>> tensioner from a wrecking yard. A wee bit of fabrication for the mount
>> and
>> you're away.
>
> Assuming you put the tensioner on the outside of the belt you wouldn't
> need to worry about the tooth pitch :-)

That occured to me 0.023581 (approx.) seconds after I hit send.

John Pitts

On 2008-02-23, Nick Payne <someone@nowhere.au> wrote:
> Usually the dropout would be detachable to allow the belt to be fitted,
> though that doesn't seem to be the case with the frame pictured. I met a
> rider on the Fitz's Challenge a couple of years ago who was riding a toothed
> belt drive bike with a Rohloff hub. The drive belt was a smaller version of
> what's used on some motorcycles. He was a fitter from Bathurst and had got a
> local framebuilder to make him the frame with detachable dropout. The
> chainring and cog he had machined himself. He gave the advantages of the
> belt drive as:
>
> Longer life than a chain
> Quieter than a chain
> No lubrication or cleaning needed
> He could sling the bike in the back seat of the car without worrying about
> getting the upholstery dirty

Jumping on this thread a bit late - I've been off the air for a couple
of weeks, moving to Brisbane.

I'm sure you and TimC are both talking about the same bloke - Mick
Cooper from Dubbo. His "belt bike" is a beautiful bit of gear.

As you say, Mick's solution to the problem of how to get the belt on
was a detachable dropout. There shouldn't be any need to take it off
again - he expects it to last forever.

--
John
"Bother," said the Borg. "We've assimilated Pooh!"

lemmiwinks.au@gmail.com

On Mar 6, 9:10 pm, John Pitts <j...@fatcyclist.com> wrote:
> --
> John
> "Bother," said the Borg. "We've assimilated Pooh!"

Heh, that sig takes me back to the fidonet days :-)

Kingsley

On Sat, 23 Feb 2008 13:35:14 +0900, Theo Bekkers wrote:

>> http://www.flickr.com/photos/bike/2250039138/
>>
>> No lube needed and sounds like it'd last longer than a conventional
>> chain as well. I wonder what it feels like to ride. Oh, and the Ti SS
>> roadie wouldn't go astray either.
>
> How do you change the belt?

See the two screws (in the first photo) at the bottom of the seat-stay?
I'm guessing that's where the frame comes apart.

cheers,
-kt