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- Dating these bikes is usually the first step toward proper appraisal of a vintage Schwinn machine. Find the serial number. Upon production, all Schwinns had a serial number stamped in one of three places on the frame. The first possible location is on the underside of the bottom bracket.
Identifying a straight bar, cantilever, and DX frame
Schwinn bicycle serial numbers are located on the underside of the bike, on the opposite side of the location of the service sticker. This is the metal space that connects the pedals. Schwinn serial numbers begin with 'IBD' or 'SN,' followed by 11 alphanumeric characters.
Since Schwinn first introduced the balloon tire bike in 1933 there have been a number of different frames used. The very early frames were of the motorbike or camel back style. The Aerocycle had a unique frame and there was a double bar roadster frame as well as a camel back in the later style frames as well.
This article is not going to cover all the varieties of frames Schwinn built through the years of which there are many. Essentially there are three basic styles; the straight bar, the DX, and the cantilever frames. Many different models were built on these frames. I am not going to try and associate the models to the frames because both straight bar and cantilever frames were used for Autocycle models and trying to explain Motorbike, Cycleplane, Standard, Super Deluxe, etc… gets complicated. This article will not cover either girls or juvenile models. The girls frames were pretty much the same and were differentiated between model lines largely by paint schemes or equipment e.g. tank, light, or rack. The juvenile models mimicked the adult models to a large degree. In the prewar years Schwinn offered their boys 26” tire models in several different frame sizes (16”, 18”, and the so-called ‘tall frame’ 20”). After the war all boys 26” tire frames were 18”.
While this may seem obvious the first thing to do is to make sure you are looking at a Schwinn frame. This is not as simple as it sounds because nearly all manufacturers made very similar frame styles. You will need to pay attention to paint schemes and colors, seat binding posts, drop outs, serial number structure, font, and size, welding construction, and other ‘tells’.
![Schwinn bikes serial number search Schwinn bikes serial number search](https://bikeindex.org/assets/serials/serial_headtube-1f40bfc0befe00079653722b1c91fa060b6f7fa679a31d674077d12ab7e58337.jpg)
Prewar frames discussed here will have the following characteristics: rear facing dropouts (Fig. 1), no built in kick stand provision, and the head tubes on boys models are shorter than girls models which means the forks will not interchange. There are other differences between pre and post war frames but these are the main characteristics.
Post war frames Cracking the periodic table code answers. will have front facing dropouts (Fig. 2), the head tubes are the same size between boys and girls bikes which means the fork whether an Ashtabula, truss, or springer will interchange. Except for some low tier ‘50s models all bikes will have a built in kick stand (Fig. 3). Middleweight frames (tire size 26” x 1 ¾”) will be narrower than balloon tire bikes.
A quick way to determine whether a frame is a balloon tire or middleweight (cantilever or straight bar) is the “three finger method”. An adult male with average size hands should be able to get three fingers comfortably through the rear seat cluster triangle on a balloon tire frame (Figs. 4, 4-1). Not so on a middleweight frame (Figs. 5, 5-1)
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As previously mentioned the first balloon tire bikes had either a motorbike or camel back style frame. Starting in 1935 Schwinn introduced a new style frame. The first design straight bar frame is generally called a ‘double diamond’ due to the straight seat stays which create a triangle or diamond shape to match the front part of the bike (Fig. 6).
Schwinn Bicycles Model Number Reference
For 1936 the straight bar frame had curved seat stays and this feature would remain through the end of production of the straight bar frame (Fig. 7).
In 1938 Schwinn introduced the iconic cantilever frame (Fig. 8). Since its introduction the cantilever frame has been copied by nearly every bicycle manufacturer.
The photograph on the left is a close up the markings that are found on the left side of this sidearm. The inscription on the slide reads as follows, 'F.B. RADOM VIS Mod. Nr.15567' and then underneath that is 'P.35(p)'. This marking indicates Fabryka Broni(weapons factory) located at Radom, Poland. The letters VIS are Latin meaning force. Vis radom p35 serial numbers number. RADOM VIS Mod. Finish: military-finish; blued. Grips: black chequered Bakelit grips. On left side FB logo. On right side VIS logo. Serial number: 4-digit number with prefix on right frame. 4-digit number with prefix inside slide. 3-digit number on barrel. Acceptance stamp: E/77 left on slide. E/77 left on frame. E/77 right on. Aug 13, 2016 Gents, Do we know when the Radom Model 35 pistols with E prefix serial numbers (with WaA77) were manufactured? The early E prefix pistols seem to be mixed into those with shoulder stock cuts while later ones without cuts still have slide legends without the added P.35(p) markings. All of these seem to be three lever pistols, so 1940ish perhaps? Apr 01, 2019 Fb Radom Vis Model 35 Serial Numbers. Jump to navigationJump to search. Manufacturer: Radom Model: P-35 Serial Number: W 3573 Caliber: 9mm See all listings by The Yankee Tell a friend Watch this listing Email Seller Print this listing. Contact Seller.Your Name:.Your Email:.Your Phone Number:.Message: Yes! On either side of the eagle are two line markings - F.B.Radom over the date on the left side, and 'VIS-wz 35' over a patent number on the right side. These pre-war guns (at the time of this writing in 2008) can (and do) bring upwards of $3000 in North America, depending on condition.
Schwinn Serial Number Ibdffsd15aa2625
![Lookup Lookup](https://bikehistory.org/catalogs/images/1968-schwinn-chart.jpg)
In 1939 Schwinn introduced a budget minded line called the DX. At first glance the DX frame (Fig. 9) looks very similar to the straight bar frame. Upon closer inspection however you will notice that the bottom bar (underneath the top tube) has a slight curve to it. For this reason the tanks between a straight bar and a DX will not interchange. The first year frame (1939) shown in Fig. 9 has built in drop stand ears. 1940 and later DX frames will not have these ears and look like Fig. 1. This is one of the few Schwinn frames to ever have this feature. The DX frame was only used until 1953 which is before Schwinn introduced its middleweight line so all DX frames are balloon tire bicycles.
By identifying whether or not a frame is pre or post war along with the style it will aid in potentially narrowing down the model of bike even if it lacks other identifying features such as a name on a chainguard which is never found on prewar bikes. As mentioned above there are many other differences on these frames, Besides the different sizes the straight bar and DX frames may have straight or curved down tubes and the tanks for B and BC straight bars will not fit C model straight bars and vice versa.
Armed with this information you should be able to determine whether you have a straight bar, DX, or cantilever frame. Enjoy the ride!