Are Deda Ti bolts always this bad?

Discuss light weight issues concerning road bikes & parts.
VTBike
Posts: 412
Joined: Mon May 16, 2011 8:14 pm

by VTBike

I have 3 Deda ZeroNero stems, ti bolts.. Never an issue, always use a torque wrench. Probably taken them off and on about 4-5 times each stem. My source for all bolts (stainless, ti, aluminum) is this guy here: http://torontocycles.com/. Highly recommended.

doomith
Posts: 58
Joined: Fri Nov 09, 2012 4:57 am

by doomith

friend has had 2 deda stems with original deda bolts and both times the bolts cracked and broke off inside the stem (with correct torquing)

by Weenie


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PSM
Posts: 1570
Joined: Tue Aug 28, 2012 2:45 pm
Location: Stockholm, The Arctic...

by PSM

I highly recommend these bolts:

http://www.tibolts.co.uk/

r_mutt
Posts: 331
Joined: Sat Feb 23, 2008 6:33 pm

by r_mutt

2 deda 0-100 stems. no broken stainless steel bolts.

Zigmeister
Posts: 921
Joined: Mon Jan 24, 2011 8:09 pm

by Zigmeister

Ritchey had this same issues with the C260 stem when they came out with those about 1yr ago...so many complaints from people regarding soft/rounding of the hex bolts. They were steel though, but doesn't matter, if the quality of metal used is poor, they won't hold up. Even titanium.

Ritchey switched mid cycle and now use a T-20 Torx setup on the stems.

If you had one of those stems, you could email Ritchey them and they would send you the new bolts to replace the older/softer ones no charge.

Sounds like Deda should do the same thing...or get them yourself from a source.

I would make the issue with Deda customer service though. If they hear enough, they might do the right thing like Ritchey. But maybe not, if so, maybe find a new stem manufacturer.

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mythical
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Joined: Fri Apr 04, 2008 2:49 am
Location: Europe
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by mythical

The idea behind the C260 clamp is that the faceplate needs less clamp force. Thus weight could be saved with lighter hardware that won't require as much torque. Going Torx is logical, since it lower the chances to round out the inside of the head. I don't understand why Ritchey didn't go that route from launch.
Tom Ritchey himself explains it in this video: https://www.youtube.com/watch?v=C1B-58LKNS4

While upgrading to Torx bolts is advantageous, though what's more important is the yield and tensile strength of the bolt. There are various industrial classifications for different categories of bolt strength. A lot of consumers aren't aware of the fundamental differences between one bolt and another. Syntace explains these differences well: http://www.syntace.com/index.cfm?pid=3&pk=373

Typically, bolts are the weakness in a stem, particularly in the area where the bar is clamped. The torsional rigidity of a stem often relates to the clamp design and bolt strength. For example: bolts spaced widely apart, although it often means a stiffer stem, puts more load on them compared to those closer together. I've heard a lot of stories of stems where bolts snapped.

The 3T Arx II is a good example of why they changed a design of an otherwise popular piece of equipment. Loss in stiffness had to be compensated though certain design tricks.
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doomith
Posts: 58
Joined: Fri Nov 09, 2012 4:57 am

by doomith

Just broke another bolt on a different deda stem last night. *f##k* deda.

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andreszucs
in the industry
Posts: 477
Joined: Mon Nov 28, 2011 7:15 am

by andreszucs

Proti ffr Titanium bolts, best in the market!

mm1
Posts: 67
Joined: Tue Jun 24, 2008 6:44 pm

by mm1

Dumb question, what dimension bolts do I need for a deda stem? Tibolts UK list some stem kits (Thompson / FSA), which of these are the right fit for a Zero 100 stem?


PSM wrote:I highly recommend these bolts:

http://www.tibolts.co.uk/" onclick="window.open(this.href);return false;

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Rick
Posts: 2035
Joined: Sat Aug 29, 2009 4:30 pm

by Rick

mythical wrote:The 3T Arx II is a good example of why they changed a design of an otherwise popular piece of equipment. Loss in stiffness had to be compensated though certain design tricks.
ImageImageImageImage

Can you elaborate upon when/how 3T changed them ? I have two of the left hand version, and more than half the stock bolts broke, so I repolaced them all with Probolt brand and have had no further problem. It seems like a bolts issue, not a stem design issue.

thp
Posts: 186
Joined: Tue May 28, 2013 10:50 pm

by thp

Can anyone post a list of good titanium bolt shops in the USA?

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andreszucs
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by andreszucs

thp wrote:Can anyone post a list of good titanium bolt shops in the USA?


www.protiglobal.com is by far the best Ti bolts available in the market and they are also starting to sell in the US. They are the best because they are Fully Forged, increasing on stiffness, also very good looking with torx head, available in 3 colors, Gold, Silver (Titanium) and Transforming Blue. Look at these links Below:
http://www.protiglobal.com/good.php?fid ... lumn1=BOLT
http://www.protiglobal.com/good.php?fid ... lumn1=BOLT

Read through their explanation on the production process:
http://www.protiglobal.com/main.php?fid=1394

If you are interested in getting some please let me know, A was recently assigned as the authorized representative for Proti-Bicycle. PM me, you can talk to me directly. :beerchug:

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