R100S Café Racer

Our first complete custom build

Born out of frustration, with the average quality of BMW Café Racers we saw on a weekly basis. This bike originally belonged to a customer of ours, It was well used, not so well looked after. When it was stolen and recovered by the police, The bike was in such a state it was deemed 'beyond economical repair' by his insurance and he offered us the salvage.

We are firm believers that nice, original, classic BMWs are better off staying that way and it is such a shame when someone buys a lovely example only to proclaim 'I'm going to Café Racer it!".

Because of its poor condition we decided there was no harm in giving it a new life. This was exactly the sort of bike that should be torn to shreds in the name of Café culture.

The Beginning:

The bike started out life as a 1979 R80/7 with unknown mileage (probably 120k or so). We stripped away all the parts that were no longer needed and started our plan, a simple rule was decided. Only BMW parts were to be used. The year of manufacture didn't matter but it had to remain, at heart, a BMW Motorcycle. It also must be useable, it will be a 'show bike' a bike that displays all of our not inconsiderable skills and capabilities but most importantly would be rideable. Not just ridable, but an enjoyable ride.

The initial plan was simple, keep the engine and frame, upgrade the suspension and the brakes. A 40 year old engine has charm and character. 40 year old brakes and suspension - not so much.

We started with the front forks. Upside down forks have become the norm in 2020, I could try explain why the lower unsprung weight makes all the difference but if were being honest, its a 40 year old engine, weight reduction is pretty redundant. The important thing is, upside down forks look cool! So if we wanted this bike to look the part, then usd forks were a must. We decided on F800R forks (2015-) and managed to buy a top + bottom yoke with forks and spindle in fair used condition on eBay. The F800 + R80 had nearly the same headstock bearings which helped for installation however the spindle between the yokes (where the steering pivots) was about 20mm longer on the F800. We sent the bottom yoke to our good friend, and great engineer, Roger Bennet. The original spindle was tapered so could not simply be shortened. Roger turned a new spindle to our specification and installed it into the bottom yoke.

TBC - So far this project is 3-4 years in - I will update this thread as often as I get time - Thanks for reading, Stephen

Features

  • R100 Engine with Krauser 4 valve heads
  • F800R Front Suspension
  • Custom rear suspension linkage
  • Short wheel base swing arm
  • Hydraulic rear drum brake
  • S1000RR Rearsets
  • R nine T Front spoked wheel (120/70-17 Tyre)
  • Custom rear rim (150/60-17)
  • F800R Radial Calipers
  • Classic cockpit race fairing
  • Modified original seat hump
Stephen
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