My baby. A Thorn eXp with Rohloff hub, or as Robin Thorn called a Raven eXp, of August 2004 vintage. She is a 530mm/short top tube frame size.
©Stephen Dee
8 Aug 2004 ID P8088447
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My New Baby |
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My new baby is a Thorn eXp with the following key specifications
She is best referred to as a Raven eXp. They are so "sexy" Robin Thorn doesn't list them - you have to ask for them over the counter and they are delivered in a very large brown cardboard box! See the St John Street Cycles website for more background details on Thorn range of cycles. |
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Transmission/Gears |
Rohloff rear hub with 16 tooth cog for details on the hub see the Rohloff website Shimano Deore chain set with 44 teeth chain ring and 170mm cranks This gives the following gears range: 20 to 105 inches in 14 equal steps, with 11th gear (direct drive) 72 inches. For a full gear table see SJS Cycles "living with a Rohloff hub", page 3. |
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Brakes |
Front: Shimano LX V brakes Rear: Shimano LX V brake Levers: Dia-Compe 287V |
| Wheels |
Front: Schmidt 28 dyno hub, with 32 spokes Rear: Rohloff hub with 32 spokes, fitted with Mavic EX721 559mm Ceramic rims and Panaracer Tour Guard, 26 x 1.75 (note these tyres do not show the correct ISO designation of tyre size). |
| Pedals | Shimano PD-M324 SPD one side/open cage on other side |
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Saddle |
Brookes Conquest |
| Handlebars | 45cm Modolo drop bars |
| Headset | FSA Orbit XL II |
| Bottom Bracket | 110mm Shimano UN72/3 68mm sealed |
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Carriers |
Front: Thorn MKIII Heavy duty lo loader Rear: Thorn "531" Reinforced adjustable rear carrier |
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Principle dimensions: |
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Frame size |
530mm Short - Thorn size 10 |
| Stand over height | 781mm (mid tube) 805mm at head tube |
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Top Tube Length: |
530mm |
| Handle bar Stem | 135mm 12° rise |
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Total lenght |
1730mm |
| Wheelbase | 1070mm |
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Centre to Centres |
Front wheel - bottom bracket: 655mm Bottom bracket to rear wheel: 435mm |
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Main triangle tube diameters (outside nominal), |
Reynolds 725 conical tubing Seat tube: 31.8mm/28.6mm takes 27.0 seat post Down tube: 31.8mm/34.9mm tapered gauge - 1.0/0.7mm Top tube: 31.8/28.6mm tapered gauge - 1.0/0.7/1.0mm |
| Rear Triangle | Reynolds 725 19mm seat stays and oval chain stays |
| Forks | Reynolds 531 ST (continental oval) with twin plate fork crown. |
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My baby. A Thorn eXp with Rohloff hub, or as Robin Thorn called a Raven eXp, of August 2004 vintage. She is a 530mm/short top tube frame size. ©Stephen Dee 8 Aug 2004 ID P8088447 |
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View from the front and rear ends. The rear
lights protrude at the sides and due to breaking several the arrangement
was changed in 2005 to one LED above the other. ©Stephen Dee 8 Aug 2004 ID P8088451 (L) 8 Aug 2004 ID P8088460 (R)
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Bottom bracket detail, showing S&S coupling and Celtic band. ©Stephen Dee 8 Aug 2004 ID P8088464 |
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Bottom bracket detail, showing the eccentric bottom bracket used for chain adjustment. ©Stephen Dee 8 Aug 2004 ID P8088473 |
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Rear End views showing the gear cable routing,
brake and rear rack details. ©Stephen Dee 8 Aug 2004 ID P8088463 (L) 8 Aug 2004 ID P8088466 (R)
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Rear end detail, showing the special drop out that has an extension for a "mini anti rotational torque arm" in the hub to locate to prevent it from rotating. This is a special feature of frames specially built for Rohloff hubs. The alternative is to have a torque arm that is fixed to the chain stay, cf the Arai hub brake, see triplet photo. ©Stephen Dee 8 Aug 2004 ID P8088473 |
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Rear end detail, showing the special drop out that has an extension for a "mini anti rotational torque arm" in the hub to locate to prevent it from rotating. This is a special feature of frames specially built for Rohloff hubs. The alternative is to have a torque arm that is fixed to the chain stay, cf the Arai hub brake, see triplet photo. ©Stephen Dee 8 Aug 2004 ID P8088472 |
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Rear end detail, showing the rear sprocket. This is a 16 tooth sprocket. ©Stephen Dee 8 Aug 2004 ID P8088483 |
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Chain set detail Deore crank and chain ring and Shimano SPD pedals.. ©Stephen Dee 8 Aug 2004 ID P8088456 |
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Transmission detail showing a nice clean and straight chain line, no derailleur to get the way and no chain alignment problems. ©Stephen Dee 8 Aug 2004 ID P8088455 |
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Seat tube detail: L - "Thorn" embossed seat stay end and pump peg. R - Seat stays - rack and brake fittings. Note the "X" bridge between the stays and the cantilever brake bridge. Normally the eXp is fitted with Suntour Self Energising Cantilever brakes, but due the gear changer fouling the cable route for the front brake, V brakes are fitted. ©Stephen Dee 8 Aug 2004 ID P8088465 (L) 8 Aug 2004 ID P8088468 (R)
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Gear changer detail. The Rohloff is designed
for use with straight handle bars, not drops. This is how they
have resolved the problem at SJS cycles. It works quite well. ©Stephen Dee 8 Aug 2004 ID P808450 |
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Gear changer detail. The Rohloff is designed
for use with straight handle bars, not drops. This is how they
have resolved the problem at SJS cycles. It works quite well, and
the short handlebar can also be used to mount a light. Its OK
proving you don't have a bar bag. I only use the white LED light
as a reading light when camping. ©Stephen Dee 8 Aug 2004 ID P808454 |
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Head tube and fork detail: L - "Thorn" badge on on the heads tube. A well located front light - this position works well with a bar bag only when you have your bars raised high up for a nice sit up riding position. R - Head tube and forks looking from the rear. ©Stephen Dee 8 Aug 2004 ID P8088467 (L) 8 Aug 2004 ID P8088469 (R)
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Handle bar detail - the first job was to remove
the "statutory" bell provided by SJSC and replace it with my "Edd the
Duck" bell and add on my old faithful Trek Radar computer. ©Stephen Dee 8 Aug 2004 ID P808486 |
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Saddle detail - a Brooks Conquest sprung leather
saddle. I have added a saddle bag quick release fitting as I
decided to go "retro" and get a saddle bag. ©Stephen Dee 8 Aug 2004 ID P808484 |
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Page last modified 2 Jan 2006
