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1972 Commando Rear Wheel RH Spacer Length ? #780665 08/06/19 1:10 am
Joined: Aug 2001
Posts: 6,153
Jon W. Whitley Offline OP
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I need to know the length of the RH spacer measurement before I possibly - needlessly order one ?


Jon W.


1957 6T Thunderbird 650
1968 T100R Daytona 500
1971 TR6R Tiger 650
1970 BSA A65F 650
1955 Tiger 100 - Project

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Re: 1972 Commando Rear Wheel RH Spacer Length ? [Re: Jon W. Whitley] #780687 08/06/19 4:10 am
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Rohan Offline
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A 73 850 is 1 & 3/8" there, with a non-precision ruler as the measuring device !

A 72 would be the same.? the parts books would confirm this.
This is with the speedo drive in place and correctly located, such that tightening
the axle locks the speedo drive at the appropriate angle for the speedo cable.

You can always use a stack of suitable washers to emulate the spacer, this is a surprisingly
precise way of figuring out what the spacer length(s) should be.

Re: 1972 Commando Rear Wheel RH Spacer Length ? [Re: Rohan] #780769 08/07/19 12:26 am
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Jon W. Whitley Offline OP
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Originally Posted by Rohan
A 73 850 is 1 & 3/8" there, with a non-precision ruler as the measuring device !

A 72 would be the same.? the parts books would confirm this.
This is with the speedo drive in place and correctly located, such that tightening
the axle locks the speedo drive at the appropriate angle for the speedo cable.

You can always use a stack of suitable washers to emulate the spacer, this is a surprisingly
precise way of figuring out what the spacer length(s) should be.



Yes, according to the parts books, '72 and '73 would be the same. Thanks for the measurement specs.


Jon W.


1957 6T Thunderbird 650
1968 T100R Daytona 500
1971 TR6R Tiger 650
1970 BSA A65F 650
1955 Tiger 100 - Project

Re: 1972 Commando Rear Wheel RH Spacer Length ? [Re: Jon W. Whitley] #781001 08/09/19 10:33 am
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jaycee Offline
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well yes and no,if you search the forum its seems to vary as was pointed out about 4 yrs ago.im the original owner of my 850 mk1.the rear wheel ALWAYS was a real pain in the ass to install. finally after reading the discussion here i took it to a machinist and had it turned down about an 1/8''.cant remember exactly but it solved the problem..in the back and forth it was unclear whether the variation was the wheel width as seen by the axle or some variation in the swingarm width between the drop outs.as i wasnt the only one that knew about this issue,i suspect it may be more common than you think.my bike is also a '73

Re: 1972 Commando Rear Wheel RH Spacer Length ? [Re: jaycee] #781054 08/10/19 12:07 am
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Jon W. Whitley Offline OP
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Originally Posted by jaycee
well yes and no,if you search the forum its seems to vary as was pointed out about 4 yrs ago.im the original owner of my 850 mk1.the rear wheel ALWAYS was a real pain in the ass to install. finally after reading the discussion here i took it to a machinist and had it turned down about an 1/8''.cant remember exactly but it solved the problem..


You had the spacer turned down an 1/8" ? Also, do you have the link for that conversation ?


Jon W.


1957 6T Thunderbird 650
1968 T100R Daytona 500
1971 TR6R Tiger 650
1970 BSA A65F 650
1955 Tiger 100 - Project

Re: 1972 Commando Rear Wheel RH Spacer Length ? [Re: Jon W. Whitley] #781058 08/10/19 12:42 am
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Rohan Offline
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Don't know the link(s), but there has been a lot of chit chat that the swingarm widths
do vary a bit - whether this is in manufacturing or subsequent flexing. And this certainly
does make refitting the wheel sometimes a bit of a muscle exercise. Make sure the
speedo drive is correctly located though...

Which is why I suggested the stack of washers to find a suitable length of spacer...

Re: 1972 Commando Rear Wheel RH Spacer Length ? [Re: Jon W. Whitley] #781074 08/10/19 3:34 am
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jaycee Offline
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thats about right as i recall,seems the sane way out was to machine the spacer to fit properly once it was determined that all was assembled properly in the first place. no i dont know how to access it as the search function here and me dont get along.i said this, as although you didnt say, you JUST MIGHT be enjoying the same drama as myself. you could do as others have suggested and stack some washer's and have one made out of stainless bar stock and then of course be done with it.

Re: 1972 Commando Rear Wheel RH Spacer Length ? [Re: jaycee] #781147 08/11/19 12:16 am
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Jon W. Whitley Offline OP
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Originally Posted by Rohan
Don't know the link(s), but there has been a lot of chit chat that the swingarm widths
do vary a bit - whether this is in manufacturing or subsequent flexing.

Which is why I suggested the stack of washers to find a suitable length of spacer...



Originally Posted by jaycee
that's about right as i recall,seems the sane way out was to machine the spacer to fit properly once it was determined that all was assembled properly in the first place. no i don't know how to access it as the search function here and me don't get along.i said this, as although you didn't say, you JUST MIGHT be enjoying the same drama as myself. you could do as others have suggested and stack some washer's and have one made out of stainless bar stock and then of course be done with it.



Good info and thank you both. Since I was able to determine that I definitely didn't have this spacer in my collection of parts, I ordered the spacer, 06-0324, so we shall see how it fits when it gets here.


Jon W.


1957 6T Thunderbird 650
1968 T100R Daytona 500
1971 TR6R Tiger 650
1970 BSA A65F 650
1955 Tiger 100 - Project


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