SOHC.co.uk Forums > CB500/550
500 rear wheel position looks off center ?
McCabe-Thiele (Ted):
I have made a reasonably accurate measurement of the distance between the brake end plate face & the outside of the bearing on the sprocket side - it works out at 157 mm +/- 1 mm. I measured this with a steel tape through the center where the axle shaft fits. The only marks are casting marks of E-7 & E1 /3.
So adding my spacers as follows from left to right its 37.5 +157 + 38.0 mm a total of 232.5 between the chain adjuster faces.
I believe most 500's have spacers from left to right spacers of 32.0 & 45 mm that would shift my wheel possibly some 7mm to the left - either way there is a difference of an extra 1.5 mm of spacer width - at present the rear wheel has quite a bit of clamping space to take up that would be reduced due to the extra 1.5 mm of space occupied by the collars.
The 500, 550F & 550F2 all appear to have the same hub part number 42601-323-030.
mickwinf:
Ted the 500 and 550 were all the same hub up to the K3/f2 which were slightly different. If you look at the ribs in the centre of the hub between the spokes, early ones have all the ribs equal hight but the later one has one rib higher, i think somewhere on the sight is a pic of the two types. I will try to measure them but at work today
McCabe-Thiele (Ted):
Thanks Mick my hub has all four ribs the same - if you have a removed wheel a measurement would be re-assuring.
Oddjob:
It's the other way round Mick, the later hubs have one rib much lower, 3 ribs of equal height and the one on the bearing retainer side sits much lower.
I know the F2/K3 brake plate doesn't fit the 500 hub as I tried it many years ago, I seem to recall it has a flange on the outside of it that rubs against the rim of the hub.
I'm wondering why the 550 uses a different spacer on the sprocket side to the 500. The engine sits in the same place I'd imagine so that means the sprocket should also need to sit in the same place to line up with the front sprocket.
Unless the frame was slightly altered between the 500 and 550 so the engine sat slightly out of line between the 2 models.
McCabe-Thiele (Ted):
Could it be they altered the rear swing arm design Ken?
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