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Seat post binder bolt & unknown frame number

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Seat post binder bolt & unknown frame number

Old 02-24-15, 08:35 AM
Bike tinker man
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Seat post binder bolt & unknown frame number

Having read on here for many years & recently become an active member, I realize there is a considerable wealth of knowledge out there so I知 hoping some people will be able to help.
Please note I知 living (retired in Malaysia from UK) & finding old bikes out here unlike what I read in the USA is almost impossible, I致e recently picked up a couple of old wrecks missing many parts, but being butted frames & forged drop outs, & other points I guess this one here is about mid 1980s,
& its my hobby.

There were absolutely no decal markings or components worth helping in the identification process, the top tube is 25.4 mm (1) the BB is 68.mm & 24.TPI same as the 1 fork, the seat post is 25.4 mm, drop out rear wheel spindle slot is 10.mm: so very high chance it痴 a UK frame. I知 expecting it to be a classic or anything rare, but be really nice to know its manufacturer for rebuild.

On rubbing down the frame as it was horribly hand painted a grotesque orange, its presently rubbed down & in the process of being primer sprayed.
I realized the seat post binder bolt was the notched type like my two of my old Raleigh痴 whereas my other bikes are not, & I cannot remember on past bikes I致e owned.

Question:- is the binder bolt specific to Raleigh only? see photo of seat post bolt hole.

Question:- the frame number is SU 89080470 does anyone recognise this numbering as it does not seem like a Raleigh number? One could say it stands for 19-89 08 month, & 0470 bike that year but it still does not say which company? The numbering is stamped across the underside of the BB, in line with the axle.

Thanks in advance to those who read & reply
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Old 02-24-15, 08:48 AM
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Reminds me of many late 70's early 80's "bike boom" frames. I had one very similar to this in the late 80's and never could figure out the origin.
Forged rear dropouts are a cut above the norm, but the 1" seat post suggests inexpensive straight-gauge 1020 tubing instead of butted.
The notched binder is not exclusive to Raleigh frames and also marks this as a lower-end (but not bottom-end) frame.
You may be correct regarding the serial number, or it could be interpreted as the 70th frame made 4th day of 8th month or 8th day of 4th month.
SU may refer to the maker or who was buying the lot of frames - any other guesses from our panel?
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Old 02-24-15, 09:42 AM
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This frame should take a standard notched binder bolt you can get these at pretty much any shop or bike coop for a couple of bucks. You don't have to use a Raliegh binder bolt they where just a standard bolt with Raliegh markings.
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