Gearwheel for input shaft

Gearwheel input shaft 17,5° 30mm
This gear is where the power is transferred in all gears. Originally, this part had a 15° gear cut. This was changed in 4/1982 to 17,5°.
Price per piece.

If your bike was manufactured after 4/1982, but before 3/1985 then this part is a direct replacement.

If your bike was manufactured before 4/1982 and never upgraded to the newer design, then you will also need to purchase a new 5th gear wheels that are also cut at 17,5°

You will also need:
Art.no. 2321997 Intermediate Shaft Gear (not available from BMW)
Output Shaft 5th Gear Wheel.
With this gear you have some choices:
Art.no. 2322993 Standard Milled gear with 5% taller gearing
Art.no. 2322992 Polished gear with 5% taller gearing for reduced friction
This is a high quality reproduction transmission gear that is better than original. Top quality precision manufacturing in Germany. This part features an undersized ID of 2/100 mm and it will have a perfect fit on used shafts.

Siebenrock product
Each original Siebenrock product bears this seal that guarantees you the highest quality possible, consistently optimized down to the last detail.

Made in Germany. Top Siebenrock quality.

Spare part for the classic BMW 2v Boxer models
R 80/7, R 80RT, R 100/7, R 100RS, R 100RT, R 100CS
R 45, R 65, R 65LS, R 65GS
R 80G/S, R 80ST
Paralever models R 80GS, R 100GS, R 100GS PD, R 80GS Basic, R 80R R 100R, R 100R Mystic
Monolever models R 65, R 65RT, R 80, R 80RT, R 100RS, R 100RT.

Compare: 23221242991/ 23-22-1-242-991