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Bikes using
frame numbers starting with 49 used lightweight Metal Profile (MP)
telescopic forks from 1950 Some very early bikes had WEB type pressed steel girder forks Roughly 1949~1953/4 |
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Bikes using
frame numbers starting with H56~H60 used DOT's own leading link forks.
These used a casting from 1956 until the new version in 1962. Some bikes still used the Earles forks into 1956 The only machine to use a different code was the road going Mancunian, it used M56#### for all of its production run, regardless of year of manufacture |
 ½ width British Hubs |
 Full width Grimeca Alloy hubs circa 1959 |
FRAME NUMBERS post 1949 |
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| 49#### | Rigid DOTs with 6E Villiers | |||||||
| 51#### | Brockhouse sv 250cc bikes 1951/1953 | |||||||
| H53#### | Swinging arm models from late 1952 until end of1954 | |||||||
| H55#### | Minor mods to frame in 1955 | |||||||
| H56#### | Frame used the 9E Villiers, no rubber engine mountings, used up to 1958 | |||||||
| H58#### | Twin engined bikes | |||||||
| H59&H60#### |
used until early 1962 H59 includes some twins |
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Bikes using frame numbers starting with H53
used DOT's own design of Earles forks Roughly 1953~1956 Though you could have specified MP forks instead
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From 1962 an all new frame and forks machine was introduced, using a modified front forks and spring steel links. |
SQUARE FRAME 1962~1968 Though possible to get later square frames with MP telescopic forks circa 1965 |
MINARELLI trails 1968 |
First letter of the frame number A = 1962 B = 1963 C = 1964 etc etc As in AA 0123 Second letter is a month identifier, but you need to know the code to work it out. Best bet is to contact the factory and for a small fee they will produce an A4 wp letter listing the bike's credentials
The number is just a serial number |
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