1954 Triumph T100 Pre-Unit Bobber Custom

Highlights

  • Well known build, frequenting The Bike Shed in London
  • Engine has been rebuilt and has done 20 miles since 
  • Stunning condition

The Appeal

This pre unit triumph started life as a Tiger 100 from 1954, and not much is known about it until a few years ago when it was purchased from an owner who was using it for racing. This meant the bike was not in road worthy condition but that was what the previous owner was looking for.

Bike purchased it was sent off to Jack at Jackson Motorcycles with the instruction to turn it into a ‘really sleek and minimal bobber’. It was found that not much on the bike was original, with the frame being from 1955 speed twin, (presumably changed during its racing days although we can’t confirm that). Again though, exactly what the previous owner was looking for and in keeping with the sentiment and practice of the ‘bobber’ conversions.

Fitted with a Cobra hard tail and a few other choice bits and pieces which we’ll expand on below, the Triumph was reborn only to be sold to fund a business enterprise. This is where our current owner comes into the picture, having picked the bike up in 2021 as a basis for improvements and design tweaks.
Once secured, the bike was again dutifully shipped off to another renown builder in the form of Dave Mitchell of Mitchell’s Classics. Dave began the strip down and refurb of the bike which involved the design changes as well as a mechanical refresh and rework. 
Having only done 20 miles since, the current owner is now looking to auction the bike due to personal reasons and due to having another all-rounder bike which they admit, suits them much better. 
 

The History and Paperwork

  • The bobber comes with a breakdown of everything it has had done during its recent re-work from ‘Mitchell’s Classics’ including engine rebuild and rework, gearbox refurbishment and clutch replacement and various miscellaneous parts and items replaced of refurbished
  • Triumph motorcycle owners club official Triumph despatch record of the frame and engine/gearbox, including dates and supplier information detailing the bikes early movements from factory
  • Invoice for the initial rebuild from ‘Jackson Motorcycles’ included detailing all work completed 
  • Operation manual for the Motogadget multifunctional speedometer
  • Photocopy of the Lancashire Archives paperwork showing the bike (highlighted)
  • Current V5C and a Triumph Workshop Instruction manual 


The Exterior

  • Cobra hard tail, 1955 Speed Twin frame with spring seat
  • Front end of the bike is an alloy Marzochi classic with twin brake shoes 
  • Rear wheel is original classic Triumph and front is an Akront rim
  • Both front and rear tyre look to be a few years old but have plenty of tread left and are not cracking or damaged from what we can see
  • Paint is a metallic black with a coloured flake and the tank and rear guard has gold ‘pinstripe’ style details with the tank also having an alloy tank strip
  • Initial build was completed with minimalism in mind in true Bobber fashion. As a result, the exterior is sleek and streamlined and does away with anything that’s not there to make you go faster or look better
  • Exterior is in fantastic condition with little to no marks or scratches to the frame or tank
  • Custom made stainless battery box 
  • The tank under the seat is half oil tank and half electric housing, made from an old fire extinguisher 
  • Small brass container has a screw top to it with a compartment inside believed to be for a basic tool kit/set of spanners etc


The Mechanics

  • 500cc engine has been rebuilt and refinished with only 20 miles put on the bike since its completion in the last year 
  • Entire bike was stripped, and the engine and gearbox was rebuilt with a new clutch 
  • The engine has a machined T140 crank with T120 push rods
  • There is a 12-volt system installed, controlled by the Motogadget unit, and shown by the dial to the right of the seat
  • Please do look through the invoice given in the photo gallery for detailed work completed
  • The bike had not been started in a while but fired up nicely in our video, the white smoke is reported to be residue from it being sat for a while
  • The bike has been stored in a dry garage, hooked up to a battery trickle charger to save the condition of the battery
  • The engine breathes through a new alloy Amal concentric carburettor and the cut off pipes the bike initially had have been given side swept end pieces
 

Summary

This bobber has been resurrected from an unroadworthy racer and has been loved and cherished since. Now in its third reincarnation, the bobber is ready for a new owner to put their mark on the bike. It really is a stunning thing, and it looks (and sounds) even better in person. Someone who is looking for their dream pre unit Triumph bobber will just have to have this, and we can’t help but feel a little jealous of the new owner already.

Notice to bidders

This item is sold on an ‘As is Where is’ basis. The condition of this item is the opinion of the seller and may differ from your own opinion. Photos and listing descriptions are for guidance purposes only*.** Car & Classic do not warrant listing accuracy. Full inspection is recommended. Viewings are at the seller’s discretion. Buyer is responsible for delivery and collection of any item purchased.*

A non-refundable buyer’s deposit is payable on this item, refer to FAQs and T&Cs for the applicable percentage.

All bidding, buying and offers are subject to our Terms and Conditions.

UK-registered cars and motorbikes on Car & Classic are run through an online HPI check. On the HPI report, this vehicle shows no insurance database markers for damage or theft. It is currently not covered by a finance agreement.

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Vehicle specification
  • Year 1955
  • Make Triumph
  • Model Pre-Unit Engine Bobber Custom
  • Colour Black
  • Odometer 20 Miles
  • Engine size 500cc
Auction Details
  • Seller Type Private
  • Town Swaffham
  • Location Cambridgeshire
  • Country United Kingdom
Bidding history
25 bids
  • ri•••• £9,100 27/07/23
  • ri•••• £9,000 27/07/23
  • gt•••• £8,750 27/07/23
  • ri•••• £8,500 27/07/23
  • an•••• £8,250 27/07/23
  • ri•••• £8,000 27/07/23
  • gt•••• £7,750 27/07/23
  • ri•••• £7,500 27/07/23
  • an•••• £7,400 27/07/23
  • ri•••• £7,250 27/07/23
Message C&C Auction Team

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