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PostPosted: Tue Jul 27, 2004 1:00 pm 
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Joined: Fri Dec 12, 2003 3:11 pm
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Location: Oxford - UK
Thought I'd share with you the weights from having stripped down my new Dura Ace 7800 rear mech.

Pivot bolt (DA) 10.38g
Pivot bolt (SRP - Al) 5.94g

Pullet wheel bolt x 2 (DA) 3.99g
Pullet wheel bolt x 2 (SRP - Al) 1.34g

Cable bolt (DA) 2.37g
Cable bolt (SRP - Ti) 1.50g


Total savings of SRP bolt kit for a DA 10 speed DR-7800 2004 rear mech 7.96g. For the obsessives, you could switch the Ti cable bolt for an Aluminium one and save a further 0.7g.

For the record before tuning 181.66g. Without barrell adjuster 177.42g.

I'm running my DA 7800 mech on a mtb with XT shifters. The shifters have barrell adjusters, so the adjuster on the mech gets dropped.

Next stage is to replace the mech plate with Carbon Fibre. Expected saving 3g. Expected final weight 165g.


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Posted: Tue Jul 27, 2004 1:00 pm 


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PostPosted: Tue Jul 27, 2004 1:25 pm 
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Joined: Wed Mar 17, 2004 1:38 pm
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All that work for 7.96 grams!!

I think you need help. I know that this is a weight weenies forum but I think you have taken it too far. Get help before you start filing down the tread serrations on your tires to save 3.458346 grams!!!!!


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PostPosted: Tue Jul 27, 2004 3:36 pm 
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Joined: Fri Oct 24, 2003 12:56 am
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Location: Toronto, Canada
that's very informative

thanks tippster for the thorough details :)


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PostPosted: Tue Jul 27, 2004 7:46 pm 
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Joined: Fri Jan 30, 2004 2:23 am
Posts: 35
Location: UK
BdaGhisallo wrote:
All that work for 7.96 grams!!

I think you need help. I know that this is a weight weenies forum but I think you have taken it too far. Get help before you start filing down the tread serrations on your tires to save 3.458346 grams!!!!!


Seconded. All that for a few grams and you end up with a less reliable component that probably doesn't work as sweetly as before.

To save the same weight, why not just pop a zit before you ride your bike! :lol:


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PostPosted: Tue Jul 27, 2004 8:15 pm 
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Joined: Thu Jan 15, 2004 1:44 am
Posts: 640
Location: Boulder, CO
simonali wrote:
To save the same weight, why not just pop a zit before you ride your bike! :lol:


I prefer to take a good poo before mountain rides and drop a pound! ;)


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PostPosted: Tue Jul 27, 2004 9:05 pm 
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Racing Aardvark wrote:
simonali wrote:
To save the same weight, why not just pop a zit before you ride your bike! :lol:


I prefer to take a good poo before mountain rides and drop a pound! ;)


you actually weighed it? Or you weighed yourself before and after?

I myself like to leave my prosthetic brain at home, saves 7 or 8 pounds.


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PostPosted: Tue Jul 27, 2004 10:18 pm 
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It seems like some "weight weenies" prefer to spend their time in the bathroom, rather than in the garage or on the road.... :P
What's wrong with Tippster posting these weights?
I agree that I wouldn't do it to my derailleur for that savings, but there is a whole listing section on hardware, and there are people that go gaga over carbon bottle cage bolts, mech. clamps, etc....those save less weight and are possibly even riskier than Tippster's subsitutions. :wink:

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PostPosted: Wed Jul 28, 2004 2:28 am 
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Seconded. All that for a few grams and you end up with a less reliable component that probably doesn't work as sweetly as before.


I bought a bike on ebay 2 yrs and 7k miles ago with a SRP kit.
Running great, and very light.
No reliability problem!


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PostPosted: Wed Jul 28, 2004 1:15 pm 
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Joined: Sat Jan 10, 2004 5:34 am
Posts: 63
Location: Hawaii
That was very good and very precise in paying attention to details. I'm glad that there are people other than myself that understands and appreciates modifications.
I guess other people would rather use the bathroom and bash others.


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PostPosted: Mon Aug 02, 2004 11:05 am 
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Joined: Fri Dec 12, 2003 3:11 pm
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Location: Oxford - UK
Finally got my Carbon mech plate for my rear mech.

Mech plate (DA) 7.30g
Mech plate (CF) 5.26g

Very pricey to shed just 2.04g. But looks the muts nuts!
The level of service from Steve at Fibre Lyte was excellent.

Complete weight 166.56g
Tuning applied:
SRP bolt kit
replaced Ti cable bolt from SRP with an Al bolt from redmist
carbon mech plate from fibre lyte
removed barrell adjuster (already have adjusters on XT shifters)

10.86g saved - cost £19 (£1.75/g) - cheaper than Ti bolt tuning

Nino has done some interesting pulley wheel tuning with a drill. I've seen pics of Deore pulley wheels, drilled to save 9g!

I realise not all visitors and/or members on this site are ULTRA weight weenies. For those that are, or considering tuning their bikes, I hope the info has been helpful.

---------
Tippster
---------


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PostPosted: Mon Aug 02, 2004 1:05 pm 
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Joined: Fri Jun 13, 2003 1:43 pm
Posts: 751
Location: Belgium
The Record derailleur pulley wheel bolt are standard drilled! I think they are steel. Is a drilled Al bolt strong enough?


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PostPosted: Mon Aug 02, 2004 2:03 pm 
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Location: Oxford - UK
The SRP pulley wheel bolts are Al drilled right throught the centre with approx 1mm diameter.

stock are solid steel


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Posted: Mon Aug 02, 2004 2:03 pm 


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