Okay so I've removed the bearings from my mag alloy small diameter axle eccentric hub and no surprise the ball bearing has been previously replaced with two separate races rather than the one peice double race. I'm comfortable with that but of course I have no reference for what quality of replacement bearing I need to buy. There are bearings from £6.25 to £25 on the internat and the stuff on ebay. This is a track focussed project and I don't want make a mistake so any guidance would be appreciated. Thanks, Andy
Don't disagree but any idea what to look for ? I took out rubber sealed ones but there are a huge variety including clearance fits from standard through C3 and stainless steel everything. The bearings I took out had 6007 RSR engraved on them and one of the bigger internet uk suppliers had a list of about 40 repalcements of varying price and sepcification. I've been an engineer all my working life but I find myself suddenly out of my depth. I'm guessing you are referring to swing arm Matt had for sale, looked a nice bit of kit when I saw it in the back of his Jag on Sunday. Anyway wot you going to build next ? Andy
Is this both sides or just the one? I ask because I've got a spare hub that AFAIK is completely standard and it has two bearings side-by-side in the smaller side and a large single bearing in the other.
dont get C3 clearance, they are increased clearance bearings high temp applications (internal engine) where the heat causes expansion. Normal clearance is what you want. Seals Suffix 2Z, 2ZR, ZZ bearing with two metal shields Example 6205 2Z or Suffix 2RS, 2RSH, 2RS1, LLU, DDU, 2RSR, EE bearing with two rubber seals Example 6205 LLU
So the sprocket side has a double ball race which originally was a one piece bearing with two ball cages and the wheel side has a roller bearing with oil seals at either end. At over £100 for the one piece double roller bearing, it is common to replace it with two single cage ball bearings each (and don't shoot me if I'm wrong) 65mm OD x 35mm ID x 14mm depth. Andy
I don't know if this is any use to you but when I need a bearing Ive generally gone here. Bearings - Orbic Bearings Ltd
Been thinking about this myself ... here's one someone did earlier ... hth Ducati rear-end reconstruction (replacing eccentric hub)
Interestingly I picked up a post off the same forum which suggested soaking the hub (in a bag) in boiling water and the bloke was exactly right. I pushed the ball bearing races out by hand with a socket and extension bar and the needle roller with the only thing I had that fitted - a can of deoderant ! Worked like magic. Andy
Yep, that's why I got a spare - mine is 'milled' from when a cush drive popped although I've not swapped it yet as there's still enough meat on the adjuster. Also the bearings in my spare are exactly as per the ones in that link; I didn't realise that this was a single bearing as when fitted, it looks like two separates - but that is the part no. as per mine.
The ones I've replaced have been paired single race bearings. Just double checked my sanity with the parts diags and they show two bearings as well........ what year is the hub from? The later bikes didnt show a rebuildable hub, but the early bikes did. From experience, if your tracing bearings down from suppliers, I'd only go for bearings having an exact match on number and fit specs. Seals are open to discussion to some degree, but always match the number and fit
I'm running a Factory 748 mag alloy swing arm and I was told that was what the original bearing looked like. I've seen the reference on the bearing in Dukedesmo's post but couldn't find it on any web site. I' comfortable fitting 2 bearings, I just want to make sure that they are the right ones. Cranker's advice is what I'll follow - he's never sold me short with his advice before. Andy
C3 is for extra radial internal clearance for speed/heat rating. That's why wheels bearings are C3 too.
Had a chat with SKF and now have a pair of 6007-2RS1s. My local Brammer was a bit more expensive than t'internet but I was able to compare what I took off in the shop so I'm content. Now got to wait until I can get out to TPCS to get the eccentric hub cleaned up and re-chromated. Andy
Simply Bearings Ltd ~ Oil Seals SKF FAG TIMKEN KOYO NTN NKE TRULOC Needle Rollers Taper Rollers Rod Ends Oil Filled Bushes Loose Balls O Rings Grease Plain Thrust Are a good source for brgs.
The bearing is a special angular contact item that takes the axial loading in both directions, it has a common outer race and separate inners, most of the radial component is handled by the needle roller. Substituting this bearing with two radial bearings is not a good idea.
