Sub 7.3 kg/6.4 kg 29'er project buildthread finished pic p 6

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Mads Kock
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Location: Malmö, Sweden
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by Mads Kock

If you're looking for light durable chainrings for sram xx - check out my lastest post on my blog. It's about Tune 39T vs. Sram XX 42T chainrings. Saved me 40 grams :-)

djm
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Location: Norway

by djm

Pent utført bygg! :-D

by Weenie


tompho
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Joined: Tue Mar 13, 2012 8:37 am

by tompho

Very good job.

anquetil
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Joined: Wed Apr 29, 2009 5:53 am
Location: Slovenia

by anquetil

Great build, but frame is to big for you.

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Martin.F
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Location: Norway, Drammen

by Martin.F

Thanks, djm and tompho.

anquetil: I know, so I changed it to a smaller one. Besides being a better fit, it saved me 15 gms or so :beerchug:
WTB Syncros bar/stem unit for foil

damond
Posts: 157
Joined: Thu Jun 03, 2010 12:47 pm

by damond

Any updates about the build Martin?

How much did it weight it the Racing Ralph's on the Sid fork?

Cheers

David

Drk0n0s
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Joined: Sun Nov 20, 2011 7:42 pm

by Drk0n0s

Perfect Ride!
Are there any photos of the bike with the rigid?

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Martin.F
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Location: Norway, Drammen

by Martin.F

No updates on the build yet. The buildlist now is as follows:

Frame: Vipera sans clearcoat - 1174g
Fork: Sid WC XX - 1446g
Headset: Frankenset - 69g
Expanders + spacers + topcap: FSA - 55g
Handlebar: AX poseidon 620mm - 94g
Grips: Extralite ultragrips - 15g
Stem: Extralite UL3 - 86g
Seat/post: Berk composites - 142g
Seatpostclamp: Procraft - 10g
Shifters: Sec gripshifts (tuned) - 94g
Front derailleur: D-A 7900 with Carbon-ti X-pull - 81g
Rear derailleur: Sram XX with Roth Shek pulleys - 165g
Cables and housings: Powercordz - 32g
Chain: Kmc - 238g
Cassette: Sram XX - 187g
Crankset: Sram XX incl sram BB30 - 745g
Pedals: Shimano XTR - 310g
Brakes: Formula r1 racing with KCNC 160mm front/rear - 517g
Wheels: Stans notubes gold - 1326g
QR: Ebay titanium/carbon - 44g
Tubes: Yellow tape + American classic valves - 14g
Sealant: Joe's - 70g
Tires: Maxxlite 29 - 694g

Adding up to a total of 7609g suspended and 6694g rigid.

Changes I had to make:
Expander: I stripped the bolt, and the stem could not hold on tight enough to keep the headset properly in place. I had a heavy FSA expander laying around
Crankset: I could not get the Lightning to fit properly, so I bought an XX
Wheels: Had some problems with the Extralite/crest, so bought Race gold
Pedals: Eggbeater 4ti's developed a LOT of play after many years of service, swapped for XTR


Changes to come.
New wheels. Hopefully something just below 1300gms and with carbon rims to make them stiffer: -30g
New pedals: I now work in a shop that sells eggbeaters, so I'm buying some 2's and some aftermarket ti spindles: -98g
Maybe new chainrings: Tune for sram XX: -22g
New expander: Extralite ultrastar + lightweight carbon topcap: -37g

Still heavier than what I started with due to heaaavy crankset, but just below 7.5kg suspended and just above 6.5 rigid. I've also looked around to find the Apro-tek MC709ca to save 200gms :O
WTB Syncros bar/stem unit for foil

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Mads Kock
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by Mads Kock

Hey Martin - you need to let us see your smaller frame :-)

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Martin.F
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by Martin.F

This bike went through a reverse diet after some failed and misfit parts.

First I couldn't get the crankset to work, so I went from 561g Lightning to 745g Sram XX - a 184g gain
Then my trusty old 4ti's died on me after several rebuilds, so I went from 168g 4ti to 306g XTR - a 138g gain
Then I had some problems with the FRM expander and the non-bolted topcap, so I went from 4g+3g = 7g to 55g FSA expander + spacer - a 48g gain

So my bike was at a total of 7605g for a while, but now it's time to update it. This is what it looks like right now

Image
IMG_6257 by Martin.F., on Flickr

I bought a new bolt and topcap for the FRM expander, and I'm going to buy a slam that stem topcap or a veloflyte one + cut the steer tube a bit more. New expander weight is 21g + 7g spacers. Trimming the topcap + removing some spacers should bring me down another 8-10g, so a total reduction of around 35g

I will most likely buy some eggbeater 2's and titanium spindles for them, or maybe just a titanium spindle for the XTR. Recommendations appreciated.

I've not been superhappy with the race gold wheels, so I'm upgrading them. Here's the start. I've bought some Light-bicycle rims promised below 360g, and they will be laced most likely with Megalite SS on the high-tension side, and X-tra lite titaniums on the low-tension side. The wheels should weigh around 1240g, and that will shed 70g + add stiffness.

Image
Mack superlight front hub by Martin.F., on Flickr

Image
Pop rear hub by Martin.F., on Flickr

Image
The pair by Martin.F., on Flickr
WTB Syncros bar/stem unit for foil

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Martin.F
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Location: Norway, Drammen

by Martin.F

Rims in place. Hopefully around 1220-1230g wheelset

Image
rim1 by Martin.F., on Flickr

Image
rim2 by Martin.F., on Flickr
WTB Syncros bar/stem unit for foil

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Mads Kock
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by Mads Kock

Don't you mean 1224-1234 grams? ;-) rims looks good - looking forward to hear about how they perform. Would be nice with a pair of carbon rims.

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Martin.F
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Location: Norway, Drammen

by Martin.F

New parts! Wheelset is taped rear, non-taped front. Assuming 5g tape pr wheel, it adds up to 1248g wheelset including tape, and 1238g bare wheels. Handlebar is 640mm wide and bar-end friendly.

Image
Mt zoom handlebar weight by Martin.F., on Flickr

Image
Rear wheel weight by Martin.F., on Flickr

Image
Front wheel weight by Martin.F., on Flickr

Image
Front hub by Martin.F., on Flickr

Image
Nipple/rim by Martin.F., on Flickr

Image
Rear hub by Martin.F., on Flickr
WTB Syncros bar/stem unit for foil

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Mads Kock
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by Mads Kock

Great wheels, Martin - had a chance to test them?

by Weenie


emike
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Location: Tallinn

by emike

Good job!

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