Binder Bolt Question
12-12-18 | 08:00 AM
#1
Binder Bolt Question
Saw an ad for a mid 80's bike this morning that has a seat post binder bolt that I have not come across before and was wondering if it could be a design issue if I would need replacement in the future. Standard Allen fitting on one end with a threaded flat head screw end on the other end. Allen head is labelled Pinarello. Is this an inferior design to the standard design? Could I replace this with a standard binder bolt or would a standard design not work here? Thank you for any assistance and info.
12-12-18 | 08:56 AM
#3
Thank you for the reply. I agree with your analysis. What I am trying to find out is whether this is a problematic design and whether replacement would be an issue if and when the time comes. I've never seen this style before. Looks to me like a more conventional binder bolt that screws into its own cap won't work here and I want to confirm. I don't want to end up with a problem down the road.
12-12-18 | 08:59 AM
#4
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12-12-18 | 09:04 AM
#5
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That’s what I was thinking, though not sure how useful it would be if the bolt was at a point where the wrench flats were rounded in the bolt head. Not much purchase in that slot, but much better than nothing!
12-12-18 | 09:45 AM
#6
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I’ve never seen or heard any chatter about problematic Pinarello seat clamps before, unlike the notoriety of Campagnolo bolt failures. I wouldn’t let this stop me on what looks like might be a pretty nice frame.
If you’re buying over the internet, maybe you can ask the seller to send a pic of the removed bolt to a) get a better idea of how it works and 2) prove it can be removed without problems.
If you’re buying over the internet, maybe you can ask the seller to send a pic of the removed bolt to a) get a better idea of how it works and 2) prove it can be removed without problems.
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N = '96 Colnago C40, '04 Wilier Alpe D'Huez, '10 Colnago EPS, '85 Merckx Pro, '89 Merckx Century, '86 Tommasini Professional, '04 Teschner Aero FX Pro, '05 Alan Carbon Cross, '86 De Rosa Professional, '95 Gios Compact Pro, '95 Carrera Zeus, ‘81 Masi Gran Criterium, ‘81 Merckx Pro, ‘89 Cinelli Supercorsa, ‘83 Bianchi Specialissima, ‘VO Randonneur, Ritchey Breakaway Steel, Rivendell Rambouillet, Heron Randonneur, ‘92 Ciöcc Columbus EL
12-12-18 | 09:50 AM
#7
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Thank you for the reply. I agree with your analysis. What I am trying to find out is whether this is a problematic design and whether replacement would be an issue if and when the time comes. I've never seen this style before. Looks to me like a more conventional binder bolt that screws into its own cap won't work here and I want to confirm. I don't want to end up with a problem down the road.
12-12-18 | 11:03 AM
#8
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The screw slot is a contingency for if/when the bolt were to break, to allow easy removal of the threaded remains of the bolt.
Good design all around.
Since binder bolts fail through the combined forces of bending, tension and torque, keeping the threads greased will help prevent bolt breakage, by reducing the torque needed to secure the post.
Good design all around.
Since binder bolts fail through the combined forces of bending, tension and torque, keeping the threads greased will help prevent bolt breakage, by reducing the torque needed to secure the post.
Last edited by dddd; 12-12-18 at 11:06 AM.
12-12-18 | 04:10 PM
#10
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Bikes: 1987 Trek 1500, 1989 Pinarello Montello, 1998 Trek 7000 MTB
Pinarello binder bolt
The bolt is dimensionally the same as the male half of the Campagnolo binder bolt. My Montello came without a bolt and I was able to use the Campy bolt until I found an affordable replacement Pinarello branded binder bolt on eBay.
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