See pre-war ID hints on Holdsworth Model pages
The first frame mentioned in early literature from Holdsworth and named after the Stelvio pass in Italy where bikes were taken for testing in the Alps. It was also in their first 1934 catalogue and continued there until 1939.
1938 Catalogue
Launched in 1934 for the keen tourist and designed for rough ground, the following year it was renamed the Stelvio Tourer and shown with rear luggage rack. Reynolds HM aircraft tubing, Special angles until 1939 then 68 deg’s, 10 1/2″ BB hight, 42 1/2″ wheel base initially.
1939 Catalogue
Early 30’s Stelvio (1934) Note: early clip type head set, also LH lamp brcket lug suggesting continental touring.
Model Recognition Table
| Frame Number System & Location (Repeated on fork Stearer Tube) | On Seat Lug & Rear of Fork Crown (Stearer Later) |
| Frame Tubing (Seat Tube ID – mm) | 1934 Reynolds HM Aircraft 1936 Reynolds 19/22g Aircraft, 20g Head 1939 Reynalds 531 optional |
| Frame Angles, Seat/Head, (deg) | 1934 68.5/69 1939 68/68 |
| Tube OD (Inch) – Top-Down-Seat | 1 – 1 1/8 – 1 1/8 |
| Head Tube Lugs | W.F.H Special Cut  |
| Forks & Crown | 1934 Reynolds HM D to Round Blades, 3″ rake 1936 Reynolds D to Round 18/21g |
| Head Set Type | Clip |
| Seat Lug | W.F.H. Special Cut Lugs |
| Seat Stay Attachment | To Seat Lug with Cut Back |
| Seat Stem Bolt | Nut & Bolt |
| Bottom Bracket Lugs | W.F.H. Special Cut Lugs |
| Gear Cable Run, Over/Under BB | n/a |
| Rear Stay Length (CBB – CDO) | 1934 HM Fluted 18 1/2″ 1936 Fluted 19g |
| Wheel Base (Spindle to Spindle) | 1934 42 1/2″ |
| Rear Dropouts (Front) | Stamped (open)  |
| Rear Brake Bridge | Straight Drilled |
| Brake Bridge Boss – Recessed Bolt | No |
| BB Hight | 1934 10 1/2″ |
| Wheel Size | 26″ |
| Head Badge/Transfer | Transfer |
| Decals & Name Plate | W F Holdsworth on down tube |
| BB Cable Guides | No |
| BB Oiler | x2, one each side |
| Gear Change Lever Lugs | No |
| Rear Stay Gear Cable Guides | No |
| TT Brake Cable Stops/Guides | 1934 x3 Under Optional? |
| Mudguard Stay Attachments | Tabs on Stays and Forks |
| Bottle Holder Bosses | No |
| Colour | 1934 XXX Black or to Order 1936 Finest Black Enamel 4 Coats |
| Chrome | None |
| Comments | 1934 Spec Simular to Typhoon (A&P tubing). 1936 Stelvio is Tourer, Typhoon is Upright differnt Spec. |