BMW R90S Fork Seals

The BMW R90S runs a 36 mm front fork.Every kit here is verified by the manufacturer to fit this exact bike. Fork seals can share a size and still not seat in a different fork, so we only list what is confirmed for your bike.

  • Fork tube36 mm
KitYearsSeal sizeReplaces OEM
55-142 1969–1976 n/a n/a

Verified fork kits we stock for your BMW R90S

Fork Oil Seal Kit — BMW R100 RS (1976-1984) + 25
Fork Seal Kit
Fork Oil Seal Kit — BMW R100 RS (1976-1984) + 25
$20.59

Fork oil for your BMW R90S

A fork-oil change on the BMW R90S uses 7.5wt fork oil, about 220 ml per leg. Factory fill: SAE 4-7.5 (BMW spec ~13.2 cSt; 7.5wt commonly used).

Liqui Moly Motorbike Fork Oil 7.5W Medium-Light — 1 Liter
Fork Oil
Liqui Moly Motorbike Fork Oil 7.5W Medium-Light —...
$17.99