Moin together. My big guy and I bought a Rieju RR50 and are quite satisfied. She only had the wheel bearings at the back, which had to be new. We then started to make ourselves too smart and bought a set of rims/tires privately, which according to the seller should have run on a RR50. Order, arrived, great joy, because the really look good and then the disillusionment when trying to install the new ones. At the front the tacho snail does not fit, because in front of the ball bearing sone kind Abst andshülse is that has 2 noses and so I couldn’t put the tachoscnail back in a reasonable way. Do I just have to flex the noses away and then the snail on top or are there suitable snails for it? Rear axle also of course n problem. The fitting sleeves between rims and recording do not fit any more with the new ones, since the rims on the recording were more than the old ones and as if that was not enough is also everything aimed at 12mm. The RR50 however has a 15mm axle… now I really measure everything and buy me new sleeves inside and outside so that I can get it installed? Unfortunately the seller is silent after I confronted him with it. Would I be happy if you have tips or can help me further. Matching new wheel bearings we have already lying. Many greetings from the vicinity of Bremen ??