Already tried it with different sizes O-ring, but fitting a O-ring on the old rims will not work.
I had one that matches perfectly and with a original BMW number, which means everybody can get one just by ordering it at a BMW Dealer. With a rubber ring, even a small one, you can't get the wheel onto the base anymore.
The O-ring in the Hub QR has the same shape as the wheel base hub. It's tapered, not flat
(not sure if tapered it's the correct english word for it)
Told you so via mail, Henk. Being stubborn?
The o-ring is just a ring which inner diameter almost matches the outer diameter of the QR.
The ring sits in a machined groove just below the ball bearings, but above the angled edge deep within the QR. The edge that exactly matches and mates with the angled edge on the CSW base hub en.
The slot for the round o-ring and the o-ring are designed as follows
A) slipping of the ring when the wheel is being inserted or removed.
B) the inner diameter of the ring can now match the QR outer diameter, so that the CSW base hub end can move past the ring.
C) the ring's outer diameter is as big as the groove's outer diameter is. When the CSW base hub end forces its way past the o-ring the ring gets compressed against the outer wall of this groove, which causes a seal and with that the snug fit.
Come on guys. Just even looking at the darn QR when its all together I can see how it works. There really is no need to try silly things that you know definitely will not work just by looking at the design.
1. Using rubber on the end will not work, as the QR slanted edge (deep inside! Past the ring!) and the hub slanted edge are an exact tight fit. Anything that fills that up will cause the ball bearings to not reach their sockets.
2. Using tape around the end will not work either, as the tape will curl up as the edges of the hub or QR will get caught on it. If it curls up tha you get the same effects as with 1.
3. Putting o-rings of any size into the old QR will not work without the machined groove to seat it in. The o-ring will just get pushed to the back with again the same result as with 1. Not causing a good fit.
There is no way in hell you can fix it without machining that groove into the QR. If one wish to try that and take the QR apart for it, be my guest. Just know that I am sure Fanatec's warranty will end with it.
It's the same type of groove you find for o-rings in a water tap. Though those often have the groove around the inner diameter, but the QR has it in the outer diameter.
The o-ring is forced against the inside of the groove as a 'sidewall' causes if to compress. This compression and tight fit causes a water tight seal on a water tap, plus it prevents any wobble from the swinging tap arm.
The science of o-rings and usage there of. Brain breaking...
Really guys, it's not rocket science
ps. If you don't believe me that this is how o-rings work. Just remove the rings from the water tap in the kitchen. Though don't let your wife catch you will making a swimming pool out of the kitchen.
We'll see...
