November’s window bike is a 1977 BMW R100S, the successor to the iconic R90S.
The R90S was designed to break free from BMW’s reputation for building reliable, but unexciting bikes. To demonstrate this, BMW raced the R90S extensively to much success, including a first and second place finish at the AMA Superbike race at Daytona International Speedway in 1976.
In 1977 BMW added another 100cc and simplified the fuel system, going back to their traditional CV carburetors. They also retired the extravagant paint schemes of earlier bikes for a simpler metallic red with gold pinstripes.
This particular bike has been repainted in gloss black and modified with blacked out wheels, forks, and final drive. The owner has also replaced the nearly silent original exhaust with throatier Vattier “mufflers” with almost no baffling whatsoever. The seat was also replaced with a period solo saddle, likely from a police bike.