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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.
https://cimg1.ibsrv.net/gimg/bikefor...082bf259eb.jpg |
Looks like the slot on the non-drive side is located on the ‘bottom’ face of the binder bolt, and the bolt’s threaded directly into the NDS ear of the seatcluster. |
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.
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Originally Posted by Sir_Name
(Post 20701424)
Looks like the slot on the non-drive side is located on the ‘bottom’ face of the binder bolt, and the bolt’s threaded directly into the NDS ear of the seatcluster. |
Originally Posted by due ruote
(Post 20701437)
Almost like the slot is for a contingency if the Allen interface gets rounded out. Just a guess. |
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. |
Originally Posted by cpsqlrwn
(Post 20701434)
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.
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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. |
I'm thinking it might be a bog-standard M6 Allen bolt with Pinarello branding. If/when it needs to be replaced, all it takes is a trip to the hardware store.
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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. |
Originally Posted by JohnDThompson
(Post 20701991)
I'm thinking it might be a bog-standard M6 Allen bolt with Pinarello branding. If/when it needs to be replaced, all it takes is a trip to the hardware store.
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