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Broken seat post binder bolt

Old 07-01-20, 06:38 PM
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jonthebiker
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Broken seat post binder bolt

Ladies and Gents, I was not paying attention as I should and not using my torque wrench and I overtightened my seatpost binder bolt on my Torelli Nitro Express steel framed bike. The part that did not break off into my hand is still on the bike and Im not quite sure how to get it out. Suggestions would be helpful. Photos below of sheared bolt headband the area in question. Thank you.


Nut end and partial bolt still stuck on bike

Rear view of area

Rear view of area again

Sheared off bolt head and partial bolt that snapped off into my hand
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Old 07-01-20, 06:45 PM
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...it should tap right out with a pin punch of the proper size and a small hammer. This is a pin punch.

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Old 07-01-20, 06:55 PM
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The first thing I would do is see if needle nose pliers can fit in the gap, maybe even forceps, to see how easy it is turn the remainder of the bolt. If it easily moves see if you can back it out.

You might be able to drill a hole to thread a screw, from the opposite side, and the drill itself might turn the bolt and remove it.

If not, put a screw in the hole and back it out.

John
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Old 07-01-20, 06:57 PM
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Although you could use a punch to extract the nut with the bolt stub still in it, I would first try to extract the broken bolt stub with the nut still in place.
It's a small diameter bolt, so drilling and using an extractor would be tough.
Question is... how tight is the remaining bolt?
I broke a bolt and was able to manipulate the remaining stub with a pin to remove it.
Too tight for a pin? Can you Dremel a divot in the bolt in order to get a grip?

All the best

Barry
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Old 07-01-20, 07:08 PM
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Thank you

Thank you ! The pin punch actually worked like a charm on the second whack. Next question. Where can I get another of these ? Are they a standard size ? Any suggestions ? Thanks in advance
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Old 07-01-20, 07:18 PM
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Is THIS what you are looking for?

I'd call them and use words like"Desperate" and "Pretty Please" in sentences.
or
Start through their dealer listing

Barry
.
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Old 07-01-20, 07:33 PM
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Yes. Looks like the one. Already emailed them about locating one as their website says out of stock. I may need to find an equivalent. But I dont know if theyre standard diameter, length, etc...
Thanks for the heads up
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Old 07-01-20, 07:38 PM
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These guys offer 3 sizes and give the dimensions.

Give your old one a measure.

Barry
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Old 07-01-20, 07:41 PM
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Originally Posted by jonthebiker View Post
Thank you ! The pin punch actually worked like a charm on the second whack. Next question. Where can I get another of these ? Are they a standard size ? Any suggestions ? Thanks in advance
...theyare now relatively standard in diameter for frames like yours. They do differ in length, So put your two pieces together and use a caliper to measure the length so you don't get one too short or too long. The Campy ones have more of a reputation for snapping than the Asien made ones, like sugino. But I don't know whether you have a keyed opening, so you might want to stick with the Campy type if you don't want to file in a little slot for the key in a keyed binder bolt.
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Old 07-02-20, 07:59 AM
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You can do a field expedient repair with any bolt which is long enough and which fits the hole, along with a nut and a couple of washers. It will get you going until you can source the proper items.
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Old 07-02-20, 08:33 AM
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Originally Posted by dsbrantjr View Post
You can do a field expedient repair with any bolt which is long enough and which fits the hole, along with a nut and a couple of washers. It will get you going until you can source the proper items.
Been there, done that. (Real hardware stores are great!) Worked like a charm until I found an LBS that had a selection of seatpost bolts so I could pick the right size.
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