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 Post subject: Project Parkpre Pro825
PostPosted: Thu Jan 22, 2009 5:44 pm 
North Wales AEC / OWMTBC 2010 Champion
North Wales AEC / OWMTBC 2010 Champion
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Joined: Sun May 11, 2008 10:13 pm
Posts: 6066
Location: Chester
EDIT: September 2010 Fianlly i'm happy with the looks and the ride is even better! Just have a few finishing touches to do.

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EDIT: 10/07/2010 Original Parkpre rigid forks (Spinner triple butted)

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EDIT. 8/04/10 Changed to Judy SL's

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17" Tange Ultimate Ultralight tubing.
M739 groupset apart from M737 rear mech, M737 spuds and M735 front mech!
Mavic 121SUP Rims
Judy DH Forks

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Last edited by Easy_Rider on Sat Oct 02, 2010 1:37 pm, edited 3 times in total.

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 Post subject:
PostPosted: Thu Jan 22, 2009 6:33 pm 
retrobike rider
retrobike rider

Joined: Sun Sep 23, 2007 11:22 pm
Posts: 7306
Location: Hove
Mmmm, I could find a home for that.

One 'detail' - I thought it was Ultimate Superlight (which is a fraction lighter than Ultimate Ultralight)?


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 Post subject:
PostPosted: Thu Jan 22, 2009 6:45 pm 
North Wales AEC / OWMTBC 2010 Champion
North Wales AEC / OWMTBC 2010 Champion
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Joined: Sun May 11, 2008 10:13 pm
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Location: Chester
Anthony wrote:
Mmmm, I could find a home for that.

One 'detail' - I thought it was Ultimate Superlight (which is a fraction lighter than Ultimate Ultralight)?


Me too, but the sticker says Ultralight :?
Fraction heavier yes but stronger on the joints than superlight. Still damn light and only a few grammes between the two!


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 Post subject:
PostPosted: Thu Jan 22, 2009 8:03 pm 
Anglian Deputy AEC
Anglian Deputy AEC
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Joined: Mon Oct 09, 2006 6:13 pm
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Location: Livin' in a dust bowl
mmm ... should be Superlight like the man said, don't know the answer to that one.

Cool bike :D 8) Wish I had a 19" 825 to add to my collection. Could I have a proper photo of the downtube decals, Ti plated sticker and head tube badge for the website, if that is possible?


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 Post subject:
PostPosted: Thu Jan 22, 2009 8:13 pm 
North Wales AEC / OWMTBC 2010 Champion
North Wales AEC / OWMTBC 2010 Champion
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Joined: Sun May 11, 2008 10:13 pm
Posts: 6066
Location: Chester
I'll sort spme pics out at the weekend for you :wink:

Damaged my knee while on holiday last week and i only just finished putting the bike together just before i left, so still haven't ridden this bike properly! I can't wait!


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 Post subject:
PostPosted: Fri Jan 23, 2009 12:09 am 
retrobike rider
retrobike rider

Joined: Sun Sep 23, 2007 11:22 pm
Posts: 7306
Location: Hove
One possibility that occurs to me is that I read somewhere that under US consumer protection law, the sticker has to be true only of what it is attached to. So it isn't impossible that the top and down tubes are Superlight and it's just the seat tube that is Ultralight.

For example, the bike shown below had an Ultrastrong down tube and seat tube, but an Ultralight top tube. And the previous year's model didn't have an Ultimate badge at all, because its seat tube was Concept - even though it had an Ultrastrong down tube and an Ultralight top tube.

Just a possibility.

[edited to include 'the bike shown below' that wasn't]


Attachments:
1994 Explosif tubeset decal.jpg
1994 Explosif tubeset decal.jpg [ 107.74 KiB | Viewed 11672 times ]


Last edited by Anthony on Fri Jan 23, 2009 4:46 pm, edited 1 time in total.
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 Post subject:
PostPosted: Fri Jan 23, 2009 1:09 am 
North Wales AEC / OWMTBC 2010 Champion
North Wales AEC / OWMTBC 2010 Champion
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Joined: Sun May 11, 2008 10:13 pm
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Location: Chester
Wow, interesting theory, you may well be right! I was thinking it could have been an early frame. I doubt we'll ever find out TBH.

From what i've researched the chemical composition is exactly the same for the two, so is the butt wall thickness (0.5mm), the only variation is the ends of the tubes (joints) where the thickness is 0.9mm versus 0.8mm, greatly increasing strength with very little weight gain.... so the theory goes anyway.


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 Post subject:
PostPosted: Fri Jan 23, 2009 4:59 pm 
retrobike rider
retrobike rider

Joined: Sun Sep 23, 2007 11:22 pm
Posts: 7306
Location: Hove
Yes, I'm sure it's just the butts that differ, the basic tubes are the same heat-treated 0.5mm material. Typically a butted tube of say 55cm (TT) will have around 10cm of butted length, 8cm of taper and so the remaining 37cm is the basic 0.5cm tube. so my excel tells me that a 8-5-8 tube will be about 4% lighter than a 9-5-9. And the top and down tubes weigh c800g say, so you're talking about 30g difference. Not a lot, if you're gaining extra strength by the butt being 0.4 instead of 0.3. Although it must be said that 0.3mm butts is pretty much the standard, and 0.4 is quite rare.


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Tange Ultimate specs.jpg
Tange Ultimate specs.jpg [ 61.76 KiB | Viewed 11671 times ]
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 Post subject:
PostPosted: Fri Jan 23, 2009 5:42 pm 
North Wales AEC / OWMTBC 2010 Champion
North Wales AEC / OWMTBC 2010 Champion
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Joined: Sun May 11, 2008 10:13 pm
Posts: 6066
Location: Chester
30g is not a lot at all. And it looks like the seatube is the same.

There are two superlights, the lower one with the thinner butts is road frame.

edit: Just have to add that i've still not ridden this bike! My knee is still buggered :(


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 Post subject:
PostPosted: Sat Jan 24, 2009 11:30 am 
Anglian Deputy AEC
Anglian Deputy AEC
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Joined: Mon Oct 09, 2006 6:13 pm
Posts: 6928
Location: Livin' in a dust bowl
Found out a great way of working out where the butting is on bike tubes. Bring a cold clean bike into a warm house - allow condensation to form on the bike tubes - as the bike slowly warms up the condensation will evaporate from the thinner (quicker to warm up) tubes. The final effect is a tube with condensation on the fatter ends and a dry in the middle. You can see how far the butting extends allong the tube.


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