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Titanium Brake Centerbolts

Old 12-13-21, 02:38 PM
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Steel Charlie
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Titanium Brake Centerbolts

Doesn't seem as tho such a thing exists for single pivots, but that make much sense to me. I mean, what with all the other/everything titanium, why not centerbolts. In the grand scheme of WeightWeenieDom that's quite a chunk of weight.

inquiring minds, etc
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Old 12-13-21, 03:54 PM
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Originally Posted by Steel Charlie View Post
Doesn't seem as tho such a thing exists for single pivots, but that make much sense to me. I mean, what with all the other/everything titanium, why not centerbolts. In the grand scheme of WeightWeenieDom that's quite a chunk of weight.

inquiring minds, etc
Charlie
O.M.A.S. made a lightweight kit for Campagnolo Record original issue brakes, Ti centerbolt shaft, and aluminum pressed on spring backing barrel with lateral adjustment flats.
Lighter than a full ti pivot bolt.
Jim Merz has made full ti centerbolts, mostly or exclusively in the drop bolt style.
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Old 12-13-21, 08:32 PM
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There's a guy in southern California who makes titanium drop bolts for Campy brakes. I know because I have one. I don't know if he makes straight bolts. He's on eBay somewhere.
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Old 12-13-21, 08:44 PM
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To answer the "why not?" question, a bolt of the same radius, etc., made of titanium instead of steel will be significantly weaker. A brake bolt would be low on my list for such a substitution.
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Old 12-13-21, 08:53 PM
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repechage
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They do flex more.
long ago when I had a lathe I made one out of 6061 T6
rear only.
never broke
also made the eccentric cam part in aluminum
never bothered to weigh them but cool and no rust.
late Super Record pad holders were aluminum with steel studs- lighter, no rust.
hey, when one trains often along Pacific Coast Highway, no rust is appreciated.
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Old 12-14-21, 03:29 PM
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OK - Thanks all

Was just wondering

Charlie
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Old 12-14-21, 05:25 PM
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Are the Ti bolt threads cut or rolled?
Rolled threads will always be much more preferable, as it's less likely to crack......
I guess the real question is, can threads be rolled on to Ti bolts?
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Old 12-15-21, 06:34 AM
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Originally Posted by Chombi1 View Post
Are the Ti bolt threads cut or rolled?
Rolled threads will always be much more preferable, as it's less likely to crack......
I guess the real question is, can threads be rolled on to Ti bolts?
Yes, you can roll threads into titanium. In fact, it is preferred due to the metal's high notch sensistivity.
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Old 12-15-21, 06:36 AM
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Here's the previously mentioned OMAS Ti brake bolt kit.

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Old 12-15-21, 10:22 AM
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it's Jim Merz, "PortlandJim" on ebay, and his stuff is top of the heap, really excellent.

right now he only offers Cinelli seat bolts, but other parts are available.

really top quality items.

/markp
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Old 12-15-21, 01:11 PM
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By some deemed as unsafe but as with most things it depends on for what purpose. For a time trial bike where you might brake (more modulating speed than stopping) for a turn a couple of times...

Ergal and ti.

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Old 12-15-21, 01:17 PM
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Absolutely not.

Any part or fastener that is restricted to the geometry of the original steel part should not be replaced with titanium UNLESS it is a very low-load and non safety-related part. Waterbottle bolts? Sure. Brake mounting bolts? No.
If the part and mating components could be redesigned to use a larger bolt or part then yes, but simply swapping in the weaker material with no other mods on a safety related part (to save single digit grams) is a bad idea.
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Old 12-15-21, 01:37 PM
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Galli made a Criterium brake set with titanium center bolts in the late '70s/early 80s.

I like the drillium levers themselves, but lever effort is high, perhaps due to overly strong caliper springs?
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Old 12-15-21, 01:47 PM
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Originally Posted by ClydeClydeson View Post
Absolutely not.

Any part or fastener that is restricted to the geometry of the original steel part should not be replaced with titanium UNLESS it is a very low-load and non safety-related part. Waterbottle bolts? Sure. Brake mounting bolts? No.
If the part and mating components could be redesigned to use a larger bolt or part then yes, but simply swapping in the weaker material with no other mods on a safety related part (to save single digit grams) is a bad idea.
Again... It all depends for what purpose. There are a lot of things in life that depends. Here is a full blown time trial bike untouched since it was used in the early 70ies. By professionals. A lot of parts on this bike would not stand the use in a road race (ergal bits, 28 spoke wheels, etc.) but they chose to build it for TT racing. And it worked. And it did not fail. For what is was used for.



They even drilled the handlebars (can be seen in this picture if looking carefully).



I am not saying it is for everybody. I am saying it depends.

Last edited by styggno1; 12-15-21 at 01:49 PM. Reason: spelling
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Old 12-15-21, 02:05 PM
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styggno1 Thanks for that, but proof that is has been done is not proof that it was ever a good idea. Pros used to use cocaine and strychnine as PEDs, and those also are not a good idea if you value your physical well being.
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Old 12-15-21, 02:12 PM
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Originally Posted by ClydeClydeson View Post
styggno1 Thanks for that, but proof that is has been done is not proof that it was ever a good idea. Pros used to use cocaine and strychnine as PEDs, and those also are not a good idea if you value your physical well being.
OK. I guess you know better. Thanks.
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Old 12-15-21, 03:14 PM
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Originally Posted by ClydeClydeson View Post
Absolutely not. Any part or fastener that is restricted to the geometry of the original steel part should not be replaced with titanium UNLESS it is a very low-load and non safety-related part. Waterbottle bolts? Sure. Brake mounting bolts? No.
If the part and mating components could be redesigned to use a larger bolt or part then yes, but simply swapping in the weaker material with no other mods on a safety related part (to save single digit grams) is a bad idea.
Real-world experience trumps speculation; 2010:



2018:



The bike in question went through every kind of punishment imaginable; Cino 2014:



Braking is absolutely confidence-inspiring or I wouldn't continue to use them - as I fully intend to do.

DD
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Old 12-15-21, 03:17 PM
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I have titanium crank fixing bolts one one crank. They seem to work fine but I pretightened with steel ones first.
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