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My New Baby

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My new baby is a Thorn eXp with the following key specifications

  • Rohloff hub gears

  • Drop bars with V brakes

  • S&S couplings

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.

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.

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

Saddle

Brookes Conquest

Handlebars 45cm Modolo drop bars
Headset FSA Orbit XL II
Bottom Bracket 110mm Shimano UN72/3 68mm sealed

Carriers

Front: Thorn MKIII Heavy duty lo loader

Rear: Thorn "531" Reinforced adjustable rear carrier

Principle dimensions:

(see also Thorn Dimension chart)

Frame size

530mm Short - Thorn size 10
Stand over height 781mm (mid tube) 805mm at head tube

Top Tube Length:

530mm
Handle bar Stem 135mm 12░ rise

Total lenght

1730mm

Wheelbase 1070mm

Centre to Centres

Front wheel - bottom bracket: 655mm

Bottom bracket to rear wheel: 435mm

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.

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.

ęStephen Dee

8 Aug 2004 ID P8088447

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.

ęStephen Dee

8 Aug 2004 ID P8088451 (L)

8 Aug 2004 ID P8088460 (R)

 

Bottom bracket detail, showing S&S coupling and Celtic band.

ęStephen Dee

8 Aug 2004 ID P8088464

Bottom bracket detail, showing the eccentric bottom bracket used for chain adjustment.

ęStephen Dee

8 Aug 2004 ID P8088473

Rear End views showing the gear cable routing, brake and rear rack details.

ęStephen Dee

8 Aug 2004 ID P8088463 (L)

8 Aug 2004 ID P8088466 (R)

 

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.

ęStephen Dee

8 Aug 2004 ID P8088473

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.

ęStephen Dee

8 Aug 2004 ID P8088472

Rear end detail, showing the rear sprocket.  This is a 16 tooth sprocket.

ęStephen Dee

8 Aug 2004 ID P8088483

Chain set detail Deore crank and chain ring and Shimano SPD  pedals..

ęStephen Dee

8 Aug 2004 ID P8088456

Transmission detail showing a nice clean and straight chain line, no derailleur to get the way and no chain alignment problems.

ęStephen Dee

8 Aug 2004 ID P8088455

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.

ęStephen Dee

8 Aug 2004 ID P8088465 (L)

8 Aug 2004 ID P8088468 (R)

 

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.

ęStephen Dee

8 Aug 2004 ID P808450

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.

ęStephen Dee

8 Aug 2004 ID P808454

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. 

ęStephen Dee

8 Aug 2004 ID P8088467 (L)

8 Aug 2004 ID P8088469 (R)

 

 

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.

ęStephen Dee

8 Aug 2004 ID P808486

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.

ęStephen Dee

8 Aug 2004 ID P808484

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Page last modified 2 Jan 2006