Serotta Seatpost binder bolt

[elong8]

I have an older Serotta road frame that is missing it's bolt. I have a Serotta track frame with the same style binder (fastback I think it's called) and it looks to be the same. I don't want to use the wrong one and strip or damage the threads. I got a 6mm bolt from the hardware store and it seems to almost fit, but I didn't force it because again: I don't wanna damage it. Is there a standard size that maybe I'm not aware of? The yellow is the road, red the track.

http://tapatalk.imageshack.com/v2/14/12/28/f580000bef145ba98b421dbd0df068c8.jpghttp://tapatalk.imageshack.com/v2/14/12/28/4dcbabda3bf1b0cf1234e2ff23bfa6c0.jpghttp://tapatalk.imageshack.com/v2/14/12/28/873efd76a008aef520ce17f713eab02d.jpg


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[Black Dog]

Was the head of the bolt to big or were you having trouble threading it in?

[pbarry]

Does the bolt from the red bike fit the yellow frame? Should be a standard M5 allen.

[David Kirk]

They will use an M6 x 1 bolt - typically 20mm long.

Head diameters can vary making the head a tight fit into the binder......is that what you are seeing?

dave

[elong8]

I was reluctant to completely remove the bolt from the red bike because it gave me some resistance toward the end. I cherish that bike (Serotta Track, super rare) and didn't wanna mess up. Sounds dumb, but I'm clumsy. I bought a 6mm bolt because the 5 was too small/loose at the hardware store. Even though it's a 6mm, a 5mm Allen wrench fits the head. Same with the red bike, which is the one currently in use. I hope that all makes sense. And thanks for your help guys.


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[dave thompson]

6mm is the size of the threaded portion of the bolt. A 6mm bolt most often has a 5mm used to install/remove it.