Rear Axle Spacer Sizes?

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Hey all,

Finally managed to get a genuine chain guard, but there's no clearance between the rear brake cover plate when it's fitted.
As the wheels are not OEM, this is no real surprise and the cover plate outer spacer looks like it's been turned up from brass.
I measure this to be pretty well 10mm (without dismantling the whole thing - yet) can anyone give me the size of the genuine article please (P/No 060334). The other side (speedo drive side) axle spacer looks genuine and about 30mm.
This is never going to go together unless the wheel is offset to the right, as it is, it's 'crabbed' over to the left and nearly fouls the mudguard.

Thanks guys.
 
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Dave Measured my 750 rear spacer speedo drive side at 1.308, Part no. in my parts book is 060324. Wheel out of 1970 Roadster
Ian
 
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Thanks Ian, that's about 33.2mm. Don't have access to the size of the spacer on the other side do you?
I've now dismantled the whole wheel assembly and I measure it to be about 0.35 inch - 9mm. It's just a bit of brass tube, can't be an OEM part. Someone's turned this up when fitting the alloy wheels. Another crappy job to rectify!
 

DogT

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On my '70 S, the long spacer measures right at 33mm and on the other side the short one is 10mm. I just happen to have it apart.

Dave
 
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Thanks Dave,

much appreciated.

Is the clearance from the chainguard to the rear brake cover plate ... er... not a lot??
 

DogT

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The clearance from the chainguard to the brake cover plate is around 10-11mm. Here are some pics after I put my rear end together hand tight. Hope it gives you a clear picture.

Dave

Rear Axle Spacer Sizes?


Rear Axle Spacer Sizes?


Rear Axle Spacer Sizes?
 
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Much appreciated Dave. Things seem a bit tighter on my rear end. Err, um I think you know what I'm trying to say.
I'll put up a pic of mine tonight, there's very little clearance if any.
 
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I had a friend turn me up a 10mm spacer and picked it up on the way home.
This is the clearance that I'm worried about (green arrow) only about 1mm from guard to brake cover plate as shown on this mockup:
Rear Axle Spacer Sizes?
 

Hortons Norton

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My bike is the same way, That is why you need the thin headed bolt on that side. Or maybe mine is wrong too? Chuck.
 

DogT

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Maybe this will show it a bit better. You should have at least 11mm clearance between the brake cover and the mount for the shock if you have all the spacers in place. Look at the picture. A is where the chainguard mounts under the shock bolt. B is the 10mm spacer and C is the lever that mounts back to the brake pivot. The total spacing for the spacer and the brake lever is around 13mm and that is the space between the brake plate and the inner side of the swing arm. There is a depression in the brake cover, but that is only 1-2mm. Now the chainguard will be spaced away from the swingarm by the distance of the bolt head on the shock mount, so you can loose another 1-2mm there. But all in all you should have at least 8-9mm minimum clearance from the chainguard to the brake plate.

Hope this helps.

Dave

Rear Axle Spacer Sizes?
 
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I know my Commando is later, but the 850 chain guard has the same issue - clearance between the guard and the chain is minimal. I ended up sliding a plumber's rubber washer (flat type with the hole in the middle) between the chain guard and the brake backing plate to keep the master link on my chain from rubbing. Also, the bolt on that shock mount is a special thin head design to fit into the mounting tab on the guard.

I thought there was something wrong with mine, but most of the others I've seen have tight clearance, and the chain and sprockets are all in alignment, so I stopped worrying.
 

DogT

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Yes, it is tight, but nothing should rub, although as you can see from my old chainguard, it is pretty well beaten up from abuse and lack of attention. I think it is an area that is subject to much abuse with things getting loose, etc.

Dave
 
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Okey doke, so that's how it's meant to be then. With the old spacer there was 0 or less clearance so the 10mm one's fine.
Thanks guys. Sorted.
Time to reassemble the whole rear end now.
 
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