Tandem Build
- grantw
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- Location: Wollongong
Tandem Build
Postby grantw » Tue Aug 19, 2014 1:54 pm
It appears to have been made out of two seprate frames but it is straight and looks to have been brazed by someone who knew what they were doing so should fit the bill for leisurely cycleway adventures to swimming holes during the summer.
Here is the frame as collected
tandem1 by _granty, on Flickr
And after a pleasant afternoon with a few spanners - it came apart very easily, nothing was seized in.
Tandem by _granty, on Flickr
And as collected this morning from the powdercoaters
Tandem - powder coated by _granty, on Flickr
I'm quite pleased with the transformation
The current plan involves some new TA Specialities Zephyr cranks from Peter White and an assortment of parts out of the spares bin to build her up.
edit: oh and I really have no idea what I'm doing here so any advice will be gratefully received!
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Re: Tandem Build
Postby ironhanglider » Tue Aug 19, 2014 6:24 pm
Look up Ghost Chainrings. They work the best for chain tensioners IMO.
Look up Sheldon and his mate John Allen for drive-train ideas. Single side drive allows you to use regular cranks.
Don't be afraid of the weight of deep Aluminium rims, the weight is irrelevant, they are cheap, strong and easily available.
Cheers,
Cameron
- Typhoon Ken
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Re: Tandem Build
Postby Typhoon Ken » Tue Aug 19, 2014 6:39 pm
- WyvernRH
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Re: Tandem Build
Postby WyvernRH » Tue Aug 19, 2014 9:33 pm
Closeups of the middle joints would be helpful?
Richard
- silentbutdeadly
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Re: Tandem Build
Postby silentbutdeadly » Wed Aug 20, 2014 9:25 am
I just learnt something new. Ta very very much. Very Much.ironhanglider wrote:Look up Ghost Chainrings. They work the best for chain tensioners IMO.
- grantw
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Re: Tandem Build
Postby grantw » Wed Aug 20, 2014 11:59 am
it's been fun so far!
There is a cog mounting to tension the synch chain so I won't need a ghost, but they are a great idea!
I'll take some photos of the joining pieces Richard, as it would be interesting to know what species of frame it is. Both bottom brackets had different serial numbers which is why I believe it was constructed from two separate frames
- koen
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Re: Tandem Build
Postby koen » Wed Aug 20, 2014 1:05 pm
Depending on where you plan to ride you may run into issues with braking performance. I raced for a couple of years on country roads with a standard caliper road brake. One day my friend and I were in Brisbane and riding around roads and bike paths. Having to stop unexpectedly was heart in mouth stuff and I had rear disc. Then I got a front disc!
(rear brakes are very effective by the way because they are weighted more than single bikes)
You may look out for an old fork with cantilever mounts and you can use v brakes. They work as well as cable discs on the right wheels.
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Re: Tandem Build
Postby ironhanglider » Wed Aug 20, 2014 8:54 pm
Suit yourself, I found the tensioning cog noisy and draggy.grantw wrote:Cheers Guys,
it's been fun so far!
There is a cog mounting to tension the synch chain so I won't need a ghost, but they are a great idea!
I'll take some photos of the joining pieces Richard, as it would be interesting to know what species of frame it is. Both bottom brackets had different serial numbers which is why I believe it was constructed from two separate frames
As for brakes, I have good performance from my dual pivot calliper on the front of my bike and I know of several other tandems running them front and rear here in Canberra and coping with some significant hills as well. I ran mine with John a few times and the braking performance for 220kg was not stellar, but it was ok. Good "compression less" brake cable housing makes a big difference. These are similar to gear cables but with a wire mesh around them to stop the strands splaying. With your ability to have two rear calliper brakes you could run a third brake off a thumb shifter, or bar end shifter to use as a parking brake. (not a drag brake or you'll get cook-offs with your rear tyres.
As per koen I agree that well set up V brakes work as well as anything going. We exchanged them for discs on the heavy tandem after a cook-off incident though.
Good cable housing is also important for your shifter cables too particularly if you want to use brifters. That being said I run a DT front shifter, which at least forces you to think about the front shifts, which is always desirable.
- grantw
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- Location: Wollongong
Re: Tandem Build
Postby grantw » Thu Aug 21, 2014 9:33 am
- grantw
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- ldrcycles
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Re: Tandem Build
Postby ldrcycles » Thu Aug 21, 2014 3:20 pm
http://www.paulcomp.com/motolite.html" onclick="window.open(this.href);return false;
- WyvernRH
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Re: Tandem Build
Postby WyvernRH » Thu Aug 21, 2014 3:59 pm
Yes, two frame numbers pretty well assures it of being a two bike join. The rear bike appears to have Nervex Pro lugs, it is/was probably a pretty good frame.grantw wrote: I'll take some photos of the joining pieces Richard, as it would be interesting to know what species of frame it is. Both bottom brackets had different serial numbers which is why I believe it was constructed from two separate frames
Hard to tell with the front one.
<edit> Actually. I've changed my mind they are Haden Firefly lugs, still probably a pretty good frame, just not quite so classy as Nervex Pro <edit>
A word on brakes from someone who has ridden tandems for (cough! cough!) years now. If you are going the caliper brake route remember that continuous braking, especially on the front wheel, heats up the rim. It is possible to blow the tyre off the wheel due to overheating - not good.... If you are not going to be screaming down any long hills then probably not a problem. Also, careful fitting discs to a front fork that is not designed to take that sort of strain, especially with all the extra mass of a tandem acting on it. Back in the old days when tandems had drum braked front forks the forks were made beefier, bigger headsets etc; the extra braking power you get with a modern disk could cause structural problems - also not good. Stick one on the rear by all means although a drum might be cheaper?
A pair of modern MTB forks would be ideal although it looks like you have a standard 1" headset so they probably wouldn't fit
Cheers
Richard
- drubie
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Re: Tandem Build
Postby drubie » Thu Aug 21, 2014 9:43 pm
but really, that's rubbish. We get none of it because the choices are illusory.
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Re: Tandem Build
Postby landyacht » Fri Aug 29, 2014 12:58 pm
we aare sticking to 9 gears at rear for now.
we started with a 700x28 on the rear but have gone up to a heavier rim (double wall,riveted) and a 32mm tyre on a 25mm wide rim. the difference in comfort and rolling resistance is really noticable. with this setup ive dropped 10psi too without it slowing me down
I should have read sheldon first but now i know that i didnt need to chop and weld pedals arms to get the threading right
- grantw
- Posts: 1792
- Joined: Mon Nov 09, 2009 11:22 am
- Location: Wollongong
- grantw
- Posts: 1792
- Joined: Mon Nov 09, 2009 11:22 am
- Location: Wollongong
Re: Tandem Build
Postby grantw » Mon May 11, 2015 10:33 pm
Tandem by Grant White, on Flickr
Tandem by Grant White, on Flickr
Tandem by Grant White, on Flickr
I took it for a quick spin last night and was surprised by how light it felt.
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Re: Tandem Build
Postby landyacht » Mon May 11, 2015 10:44 pm
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