Has anyone moved their set of wheels to another bike? I have a set on my 696 and want to shift them over to my 749s, front looks ok but rear is a smaller axle. When I had them off briefly I saw the disc carrier may also house the spacer, did not inspect the sprocket side though. Any info on fitting and possible spacer kits from oz or if it’s one size only would be very helpful. cheers
Update on this if anyone is interested, I had no reply from oz and the Uk distributor said they do not sell carriers or spacers etc, so I may machine the carriers on the wheel to a larger diameter, unless anyone is in need of a small diameter oz rear wheel.
So doing some research, and it looks like I can run a different bearing, so I would only have to get some spacers remade. Can anyone with experience with bearings gleam some light on running a thinner bearing. Oz wheel bearing 47x25x12 749 bearing 55x30x13 Bearing I found from a supplier 47x30x13 rated for high speed, rubber seal bb bearing.
I'll see if I can dig out my bearings 'bible'. My concern about using the 47x30 would be the much smaller ball diameter which, if I remember correctly, might influence the radial load capacity.
From my SKF book... The dynamic load rating is the important rating in my opinion as this determiones life. 47x25x12 : 11.9kN (6005 designation) 55x30x13 : 13.8kN (6006 designation) So they're not a million miles away from each other - it's basically down to the radial-dimension difference, which determines the approx ball diameter and thus ball-track area. Unfortunately, it appears that your 47x30x13 bearing is non-standard and I can't find any rating info for it However, my reservation still stands - the balls will be a lot smaller in the 47x30x13 so would have a much lower dynamic losd rating; my estimate of the load-rating reduction would be about 1.6 (having compared a couple of similarly-sized bearings), so you'd be looking at a dynamic rating of around 7 to 8kN, which is about half the 55x30x13 rating. Put simply - it'll wear out in half the time.
great stuff thankyou, the bearing I found has this designation 61906, I checked this on skfs website, same ID and OD but smaller width, dynamic load is 7.28kn right in the ball park you stated above. many thanks for your help, I will get the carriers machined to fit the standard bearings. thanks again!
So I popped the wheel off today, the bearings are large enough to accommodate the 749 axle, I will just need to get the spacers out for machining. Has anyone removed the spacers from oz wheels before? I can see a small lip from the opposite side but I am abit reluctant to start tapping it out as the is no play in the at all. Cheers
Not sure I fully understand the arrangement however, if you need to remove the bearing to get to the spacer, I suggest that you use a Rawbolt. These are available from DIY shops/Screwfix etc and are an expanding bolt. Screw it into the bearing and expand it using the nut and then drift it out from the opposite end using the spindle or a suitable long drift.
There is no contact to the bearing, I think I saw a pic where a snap ring was present under the dust cover, but I did not screenshot it. Better picture below
So I took the chance and drove the spacer out from the inside, it popped out, then I drove the other side out, the whole sprocket carrier comes out. There are two 30mm I’d bearings in the wheel it’s self(perfect) there is the internal spacer and the brake side spacer, the drive side however has another bearing, with a 2 piece spacer either side(haven’t got this out yet). I will drive out the bearing in the carrier and separate the spacer, then send off for machining. Will post some before and afters. Wheel sitting on the 749, on the internal bearings.
