cSt stands for “centistokes”, it's a unit of viscosity.īrand / weight / model nominal weight Reported Reported ReportedĬoefficient (VTC) VT Line (like water, Clear) 5.50 2.30 344 343 0.58 2.39.It doesn't just mean hot-day vs.Ĭold day, it means begining of race vs. The other interesting number is the Viscosity Index (VI), which is how stable the viscosity is over a wide temperature range. GenerallyĪ size 13 will be bigger than a size 4, but you can't count on a sizeĩ from one designer to be the same size as a 9 from another. Not really in the same order as the real weight.ĬSt is an actual standard, unlike nominal weight, which is notĮntirely arbitary, but more like women's clothing sizes. I will use Opie next time I need fork oil, Tim, you are a top man.This table is sorted by real viscosity (centiStokes), not by The oil I supplied to Ernie turned out to have a viscosity of 47.4, no wonder it was bloody stiff. So as you can see from the figures above the W number bears no resemblance to the viscosity. Red Line Light Weight Suspension Fluid 16 I then set about finding others that were in the same range so I had a choice.įork Oil recommendations for the Yamaha FJR 1300A He came back again with a recommendation for Motul Light 5W Factory Line Motorcycle Fork Oil which has a viscosity of 18, so close enough for me. Telling him my aim was a viscosity of 19. His first recommendation was for any 5W oil until I pointed out that it was the viscosity that was the critical factor as the 5, 7.5, 10W etc bore no resemblance to the viscosity. I contacted Opie Oils for some advice and Tim (very helpful) set about finding me some suitable oil. The Ohlins site however was more helpful giving a viscosity of 19 mm2 Centistokes 40° C. A US site tell me that Yamaha M1 is a zero weight oil but no viscosity figures. The Yamaha manual recommends Yamaha Suspension Oil M1 or Ohlins R&T43.īoth of which seem pretty scarce in the uk. The manufacturers W numbers bear no resemblance to the viscosity. I had already purchased the oil before I sent them off so Ernie put it what I had sent him.
They were stiffer than a stiff thing on a stiff day. The searching started when I took my first ride after fitting my newly sealed forks. So I suppose you could say I knew fork oil about fork oil. Before I started researching fork oil I didn’t know much about it other than it was oily.
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